var-201103-0280
Vulnerability from variot
Integer overflow in HFS in Apple Mac OS X before 10.6.7 allows local users to read arbitrary (1) HFS, (2) HFS+, or (3) HFS+J files via a crafted F_READBOOTSTRAP ioctl call. A local attacker can exploit this issue to obtain sensitive information that may lead to further attacks. Due to the nature of this issue, local attackers may be able to execute arbitrary code in the context of the kernel, but this has not been confirmed. Versions prior to OS X 10.6.7 are vulnerable. NOTE: This issue was previously discussed in BID 46950 (Apple Mac OS X Prior to 10.6.7 Multiple Security Vulnerabilities) but has been given its own record to better document it. ----------------------------------------------------------------------
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TITLE: Apple Mac OS X Multiple Vulnerabilities
SECUNIA ADVISORY ID: SA43814
VERIFY ADVISORY: Secunia.com http://secunia.com/advisories/43814/ Customer Area (Credentials Required) https://ca.secunia.com/?page=viewadvisory&vuln_id=43814
RELEASE DATE: 2011-03-22
DISCUSS ADVISORY: http://secunia.com/advisories/43814/#comments
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DESCRIPTION: Apple has issued a security update for Mac OS X, which fixes multiple vulnerabilities.
1) A divide-by-zero error in AirPort when handling Wi-Fi frames can be exploited to cause a system reset.
2) Multiple vulnerabilities in Apache can be exploited by malicious people to disclose potentially sensitive information and by malicious users and malicious people to cause a DoS (Denial of Service).
For more information: SA40206
3) A format string error within AppleScript Studio when handling certain commands via dialogs can be exploited to potentially execute arbitrary code.
4) An unspecified error in the handling of embedded OpenType fonts in Apple Type Services (ATS) can be exploited to cause a heap-based buffer overflow when a specially crafted document is viewed or downloaded.
5) Multiple unspecified errors in the handling of embedded TrueType fonts in Apple Type Services (ATS) can be exploited to cause a buffer overflow when a specially crafted document is viewed or downloaded.
6) Multiple unspecified errors in the handling of embedded Type 1 fonts in Apple Type Services (ATS) can be exploited to cause a buffer overflow when a specially crafted document is viewed or downloaded.
7) Multiple unspecified errors in the handling of SFNT tables in embedded fonts in Apple Type Services (ATS) can be exploited to cause a buffer overflow when a specially crafted document is viewed or downloaded.
8) An integer overflow error in bzip2 can be exploited to terminate an application using the library or execute arbitrary code via a specially crafted archive.
For more information: SA41452
9) An error within the "FSFindFolder()" API in CarbonCore when used with the "kTemporaryFolderType" flag can be exploited to disclose the contents of arbitrary directories.
10) Multiple errors in ClamAV can be exploited by malicious people to cause a DoS (Denial of Service) and potentially compromise a vulnerable system.
For more information: SA41503 SA42426
11) An unspecified error in the handling of embedded fonts in CoreText can be exploited to corrupt memory when a specially crafted document is viewed or downloaded.
13) An error in ImageIO within the handling of JPEG files can be exploited to cause a heap-based buffer overflow.
14) An integer overflow error in ImageIO within the handling of XBM files can be exploited to potentially execute arbitrary code.
15) An error in libTIFF within the handling of JPEG encoded TIFF files can be exploited to cause a buffer overflow.
16) An error in libTIFF within the handling of CCITT Group 4 encoded TIFF files can be exploited to cause a buffer overflow.
17) An integer overflow error in ImageIO within the handling of JPEG encoded TIFF files can be exploited to potentially execute arbitrary code.
18) Multiple errors in Image RAW when handling Canon RAW image files can be exploited to cause buffer overflows.
19) An error in the Install Helper when handling URLs can be exploited to install an arbitrary agent by tricking the user into visiting a malicious website.
20) Multiple errors in Kerberos can be exploited by malicious users and malicious people to conduct spoofing attacks and bypass certain security features.
22) An integer truncation error within Libinfo when handling NFS RPC packets can be exploited to cause NFS RPC services to become unresponsive.
23) An error exists in the libxml library when traversing the XPath.
For more information: SA42175
24) A double free error exists in the libxml library when handling XPath expressions.
For more information: SA42721
25) Two errors in Mailman can be exploited by malicious users to conduct script insertion attacks.
For more information: SA41265
26) Multiple errors in PHP can be exploited by malicious users and malicious people to bypass certain security restrictions and by malicious people to cause a DoS (Denial of Service) and potentially compromise a vulnerable system.
For more information: SA39573 SA41724
27) Multiple errors in PHP can be exploited by malicious users and malicious people to bypass certain security restrictions.
For more information: SA41724
28) An error in the OfficeImport framework when processing records containing formulas shared between multiple cells can be exploited to corrupt memory and potentially execute arbitrary code.
29) An error in QuickLook when handling certain Microsoft Office files can be exploited to corrupt memory when a specially crafted document is downloaded.
30) Multiple unspecified errors in QuickTime when handling JPEG2000, FlashPix, and panorama atoms in QTVR (QuickTime Virtual Reality) movie files can be exploited to corrupt memory via specially crafted files.
31) An integer overflow error in QuickTime when handling certain movie files can be exploited to potentially execute arbitrary code when a specially crafted file is viewed.
32) An error within QuickTime plug-in when handling cross-site redirects can be exploited to disclose video data.
33) An integer truncation error within the Ruby BigDecimal class can be exploited to potentially execute arbitrary code.
This vulnerability only affects 64-bit Ruby processes.
34) A boundary error in Samba can be exploited by malicious people to potentially compromise a vulnerable system.
For more information: SA41354
35) A security issue in Subversion can be exploited by malicious people to bypass certain security restrictions.
For more information: SA41652
36) A weakness in Terminal uses SSH version 1 as the default protocol version when using ssh via the "New Remote Connection" dialog.
37) Some vulnerabilities in FreeType can be exploited to cause a DoS (Denial of Service) or potentially compromise an application using the library.
For more information: SA41738
SOLUTION: Update to version 10.6.7 or apply Security Update 2011-001.
PROVIDED AND/OR DISCOVERED BY: 15, 16, 33) Reported by the vendor.
The vendor credits: 3) Alexander Strange. 5) Christoph Diehl of Mozilla, Felix Grobert of the Google Security Team, Marc Schoenefeld of Red Hat Security Response Team, and Tavis Ormandy and Will Drewry of Google Security Team. 6) Felix Grobert, Google Security Team and geekable via ZDI. 7) Marc Schoenefeld, Red Hat Security Response Team. 11) Christoph Diehl, Mozilla. 12) Dan Rosenberg, Virtual Security Research. 13) Andrzej Dyjak via iDefense. 14) Harry Sintonen. 17) Dominic Chell, NGS Secure. 18) Paul Harrington, NGS Secure. 19) Aaron Sigel, vtty.com. 21) Jeff Mears. 22) Peter Schwenk, University of Delaware. 28) Tobias Klein via iDefense. 29) Charlie Miller and Dion Blazakis via ZDI. 30) Will Dormann of CERT/CC, Damian Put and an anonymous researcher via ZDI, and Rodrigo Rubira Branco of Check Point Vulnerability Discovery Team. 31) Honggang Ren, Fortinet's FortiGuard Labs. 32) Nirankush Panchbhai and Microsoft Vulnerability Research (MSVR). 36) Matt Warren, HNW Inc.
ORIGINAL ADVISORY: Apple: http://support.apple.com/kb/HT4581
iDefense: http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=898
OTHER REFERENCES: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
DEEP LINKS: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
EXTENDED DESCRIPTION: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
EXTENDED SOLUTION: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
EXPLOIT: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
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. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
VSR Security Advisory
http://www.vsecurity.com/
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Advisory Name: Apple HFS+ Information Disclosure Vulnerability Release Date: 2011-03-22 Application: Apple OS X kernel (XNU) Versions: All versions <= xnu-1504.7.4 Severity: Medium Author: Dan Rosenberg Vendor Status: Patch Released [2] CVE Candidate: CVE-2011-0180 Reference: http://www.vsecurity.com/resources/advisory/20110322-1/
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Product Description
- From [1]:
"Beneath the appealing, easy-to-use interface of Mac OS X is a rock-solid, UNIX-based foundation that is engineered for stability, reliability, and performance. The kernel environment is built on top of Mach 3.0 and provides high-performance networking facilities and support for multiple, integrated file systems."
Vulnerability Overview
On June 30th, VSR identified a vulnerability in HFS+, a filesystem implemented in the OS X XNU kernel. By exploiting this vulnerability, an unprivileged user with local access to a machine using HFS+ may be able to read raw filesystem data, bypassing file permissions and resulting in information disclosure.
Vulnerability Details
Users may interact with the filesystem using the standard ioctl interface. The ioctl intends to ensure that this data is restricted to the first 1024 bytes, where bootstrap information is stored. However, due to an integer overflow in the code that attempts to enforce this restriction, it is possible for an unprivileged user to use this ioctl to read large portions of filesystem data outside of this byte range, leading to an information disclosure vulnerability.
The vulnerable check reads as follows, in bsd/hfs/hfs_readwrite.c:
if (user_bootstrapp->fbt_offset + user_bootstrapp->fbt_length > 1024) return EINVAL;
If a user provides values for the fbt_offset and fbt_length members such that their sum overflows and wraps around to an integer less than 1024, portions of filesystem data outside the intended range will be read and returned to the user.
Proof-of-Concept Exploit
VSR has developed a proof-of-concept exploit [3] to both demonstrate the severity of this issue as well as allow users and administrators to verify the existence of the vulnerability.
Versions Affected
Testing was performed on Darwin Kernel Version 10.4.0, xnu-1504.7.4~1, but review of older source code suggests that all versions of OS X may be affected.
Vendor Response
The following timeline details Apple's response to the reported issue:
2010-07-01 Apple was provided a draft advisory 2010-07-02 Apple acknowledges receipt of advisory 2010-07-22 Request for confirmation of issue 2010-07-25 Apple confirms issue under investigation 2010-09-02 Request for status update 2010-09-02 Apple confirms fix is being tested 2010-10-13 Request for status update 2010-10-14 Apple confirms fix is planned for undetermined date 2010-11-16 Request for status update 2010-11-16 Apple confirms ship date is set for early 2011 2011-01-18 Request for status update 2011-01-18 Apple confirms ship date for early April 2011-03-21 Apple publishes fix
Apple's advisory may be obtained at: http://support.apple.com/kb/HT4581
Recommendation
Apply the fix provided by Apple's OS X security update [2].
Common Vulnerabilities and Exposures (CVE) Information
The Common Vulnerabilities and Exposures (CVE) project has assigned the number CVE-2011-0180 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems.
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References:
-
Darwin and Core Technologies http://developer.apple.com/mac/library/documentation/MacOSX/Conceptual/OSX_Technology_Overview/SystemTechnology/SystemTechnology.html
-
HFS+ F_READBOOTSTRAP information disclosure exploit http://www.vsecurity.com/download/tools/hfs-dump.c
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This advisory is distributed for educational purposes only with the sincere hope that it will help promote public safety. This advisory comes with absolutely NO WARRANTY; not even the implied warranty of merchantability or fitness for a particular purpose. Virtual Security Research, LLC nor the author accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
See the VSR disclosure policy for more information on our responsible disclosure practices: http://www.vsecurity.com/disclosurepolicy.html
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"data": "Integer overflow in HFS in Apple Mac OS X before 10.6.7 allows local users to read arbitrary (1) HFS, (2) HFS+, or (3) HFS+J files via a crafted F_READBOOTSTRAP ioctl call. \nA local attacker can exploit this issue to obtain sensitive information that may lead to further attacks. Due to the nature of this issue, local attackers may be able to execute arbitrary code in the context of the kernel, but this has not been confirmed. \nVersions prior to OS X 10.6.7 are vulnerable. \nNOTE: This issue was previously discussed in BID 46950 (Apple Mac OS X Prior to 10.6.7 Multiple Security Vulnerabilities) but has been given its own record to better document it. ----------------------------------------------------------------------\n\n\nMeet Secunia @ Microsoft Management Summit (MMS) in Las Vegas, USA (21-25 March). \n\nhttp://secunia.com/company/events/mms_2011/\n\n\n----------------------------------------------------------------------\n\nTITLE:\nApple Mac OS X Multiple Vulnerabilities\n\nSECUNIA ADVISORY ID:\nSA43814\n\nVERIFY ADVISORY:\nSecunia.com\nhttp://secunia.com/advisories/43814/\nCustomer Area (Credentials Required)\nhttps://ca.secunia.com/?page=viewadvisory\u0026vuln_id=43814\n\nRELEASE DATE:\n2011-03-22\n\nDISCUSS ADVISORY:\nhttp://secunia.com/advisories/43814/#comments\n\nAVAILABLE ON SITE AND IN CUSTOMER AREA:\n * Last Update\n * Popularity\n * Comments\n * Criticality Level\n * Impact\n * Where\n * Solution Status\n * Operating System / Software\n * CVE Reference(s)\n\nhttp://secunia.com/advisories/43814/\n\nONLY AVAILABLE IN CUSTOMER AREA:\n * Authentication Level\n * Report Reliability\n * Secunia PoC\n * Secunia Analysis\n * Systems Affected\n * Approve Distribution\n * Remediation Status\n * Secunia CVSS Score\n * CVSS\n\nhttps://ca.secunia.com/?page=viewadvisory\u0026vuln_id=43814\n\nONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:\n * AUTOMATED SCANNING\n\nhttp://secunia.com/vulnerability_scanning/personal/\nhttp://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/\n\nDESCRIPTION:\nApple has issued a security update for Mac OS X, which fixes multiple\nvulnerabilities. \n\n1) A divide-by-zero error in AirPort when handling Wi-Fi frames can\nbe exploited to cause a system reset. \n\n2) Multiple vulnerabilities in Apache can be exploited by malicious\npeople to disclose potentially sensitive information and by malicious\nusers and malicious people to cause a DoS (Denial of Service). \n\nFor more information:\nSA40206\n\n3) A format string error within AppleScript Studio when handling\ncertain commands via dialogs can be exploited to potentially execute\narbitrary code. \n\n4) An unspecified error in the handling of embedded OpenType fonts in\nApple Type Services (ATS) can be exploited to cause a heap-based\nbuffer overflow when a specially crafted document is viewed or\ndownloaded. \n\n5) Multiple unspecified errors in the handling of embedded TrueType\nfonts in Apple Type Services (ATS) can be exploited to cause a buffer\noverflow when a specially crafted document is viewed or downloaded. \n\n6) Multiple unspecified errors in the handling of embedded Type 1\nfonts in Apple Type Services (ATS) can be exploited to cause a buffer\noverflow when a specially crafted document is viewed or downloaded. \n\n7) Multiple unspecified errors in the handling of SFNT tables in\nembedded fonts in Apple Type Services (ATS) can be exploited to cause\na buffer overflow when a specially crafted document is viewed or\ndownloaded. \n\n8) An integer overflow error in bzip2 can be exploited to terminate\nan application using the library or execute arbitrary code via a\nspecially crafted archive. \n\nFor more information:\nSA41452\n\n9) An error within the \"FSFindFolder()\" API in CarbonCore when used\nwith the \"kTemporaryFolderType\" flag can be exploited to disclose the\ncontents of arbitrary directories. \n\n10) Multiple errors in ClamAV can be exploited by malicious people to\ncause a DoS (Denial of Service) and potentially compromise a\nvulnerable system. \n\nFor more information:\nSA41503\nSA42426\n\n11) An unspecified error in the handling of embedded fonts in\nCoreText can be exploited to corrupt memory when a specially crafted\ndocument is viewed or downloaded. \n\n13) An error in ImageIO within the handling of JPEG files can be\nexploited to cause a heap-based buffer overflow. \n\n14) An integer overflow error in ImageIO within the handling of XBM\nfiles can be exploited to potentially execute arbitrary code. \n\n15) An error in libTIFF within the handling of JPEG encoded TIFF\nfiles can be exploited to cause a buffer overflow. \n\n16) An error in libTIFF within the handling of CCITT Group 4 encoded\nTIFF files can be exploited to cause a buffer overflow. \n\n17) An integer overflow error in ImageIO within the handling of JPEG\nencoded TIFF files can be exploited to potentially execute arbitrary\ncode. \n\n18) Multiple errors in Image RAW when handling Canon RAW image files\ncan be exploited to cause buffer overflows. \n\n19) An error in the Install Helper when handling URLs can be\nexploited to install an arbitrary agent by tricking the user into\nvisiting a malicious website. \n\n20) Multiple errors in Kerberos can be exploited by malicious users\nand malicious people to conduct spoofing attacks and bypass certain\nsecurity features. \n\n22) An integer truncation error within Libinfo when handling NFS RPC\npackets can be exploited to cause NFS RPC services to become\nunresponsive. \n\n23) An error exists in the libxml library when traversing the XPath. \n\nFor more information:\nSA42175\n\n24) A double free error exists in the libxml library when handling\nXPath expressions. \n\nFor more information:\nSA42721\n\n25) Two errors in Mailman can be exploited by malicious users to\nconduct script insertion attacks. \n\nFor more information:\nSA41265\n\n26) Multiple errors in PHP can be exploited by malicious users and\nmalicious people to bypass certain security restrictions and by\nmalicious people to cause a DoS (Denial of Service) and potentially\ncompromise a vulnerable system. \n\nFor more information:\nSA39573\nSA41724\n\n27) Multiple errors in PHP can be exploited by malicious users and\nmalicious people to bypass certain security restrictions. \n\nFor more information:\nSA41724\n\n28) An error in the OfficeImport framework when processing records\ncontaining formulas shared between multiple cells can be exploited to\ncorrupt memory and potentially execute arbitrary code. \n\n29) An error in QuickLook when handling certain Microsoft Office\nfiles can be exploited to corrupt memory when a specially crafted\ndocument is downloaded. \n\n30) Multiple unspecified errors in QuickTime when handling JPEG2000,\nFlashPix, and panorama atoms in QTVR (QuickTime Virtual Reality)\nmovie files can be exploited to corrupt memory via specially crafted\nfiles. \n\n31) An integer overflow error in QuickTime when handling certain\nmovie files can be exploited to potentially execute arbitrary code\nwhen a specially crafted file is viewed. \n\n32) An error within QuickTime plug-in when handling cross-site\nredirects can be exploited to disclose video data. \n\n33) An integer truncation error within the Ruby BigDecimal class can\nbe exploited to potentially execute arbitrary code. \n\nThis vulnerability only affects 64-bit Ruby processes. \n\n34) A boundary error in Samba can be exploited by malicious people to\npotentially compromise a vulnerable system. \n\nFor more information:\nSA41354\n\n35) A security issue in Subversion can be exploited by malicious\npeople to bypass certain security restrictions. \n\nFor more information:\nSA41652\n\n36) A weakness in Terminal uses SSH version 1 as the default protocol\nversion when using ssh via the \"New Remote Connection\" dialog. \n\n37) Some vulnerabilities in FreeType can be exploited to cause a DoS\n(Denial of Service) or potentially compromise an application using\nthe library. \n\nFor more information:\nSA41738\n\nSOLUTION:\nUpdate to version 10.6.7 or apply Security Update 2011-001. \n\nPROVIDED AND/OR DISCOVERED BY:\n15, 16, 33) Reported by the vendor. \n\nThe vendor credits:\n3) Alexander Strange. \n5) Christoph Diehl of Mozilla, Felix Grobert of the Google Security\nTeam, Marc Schoenefeld of Red Hat Security Response Team, and Tavis\nOrmandy and Will Drewry of Google Security Team. \n6) Felix Grobert, Google Security Team and geekable via ZDI. \n7) Marc Schoenefeld, Red Hat Security Response Team. \n11) Christoph Diehl, Mozilla. \n12) Dan Rosenberg, Virtual Security Research. \n13) Andrzej Dyjak via iDefense. \n14) Harry Sintonen. \n17) Dominic Chell, NGS Secure. \n18) Paul Harrington, NGS Secure. \n19) Aaron Sigel, vtty.com. \n21) Jeff Mears. \n22) Peter Schwenk, University of Delaware. \n28) Tobias Klein via iDefense. \n29) Charlie Miller and Dion Blazakis via ZDI. \n30) Will Dormann of CERT/CC, Damian Put and an anonymous researcher\nvia ZDI, and Rodrigo Rubira Branco of Check Point Vulnerability\nDiscovery Team. \n31) Honggang Ren, Fortinet\u0027s FortiGuard Labs. \n32) Nirankush Panchbhai and Microsoft Vulnerability Research (MSVR). \n36) Matt Warren, HNW Inc. \n\nORIGINAL ADVISORY:\nApple:\nhttp://support.apple.com/kb/HT4581\n\niDefense:\nhttp://labs.idefense.com/intelligence/vulnerabilities/display.php?id=898\n\nOTHER REFERENCES:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nDEEP LINKS:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nEXTENDED DESCRIPTION:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nEXTENDED SOLUTION:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nEXPLOIT:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\nprivate users keeping their systems up to date against the latest\nvulnerabilities. \n\nSubscribe:\nhttp://secunia.com/advisories/secunia_security_advisories/\n\nDefinitions: (Criticality, Where etc.)\nhttp://secunia.com/advisories/about_secunia_advisories/\n\n\nPlease Note:\nSecunia recommends that you verify all advisories you receive by\nclicking the link. \nSecunia NEVER sends attached files with advisories. \nSecunia does not advise people to install third party patches, only\nuse those supplied by the vendor. \n\n----------------------------------------------------------------------\n\nUnsubscribe: Secunia Security Advisories\nhttp://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org\n\n----------------------------------------------------------------------\n\n\n. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\n\n VSR Security Advisory\n http://www.vsecurity.com/\n\n- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-\n\nAdvisory Name: Apple HFS+ Information Disclosure Vulnerability\n Release Date: 2011-03-22\n Application: Apple OS X kernel (XNU)\n Versions: All versions \u003c= xnu-1504.7.4\n Severity: Medium\n Author: Dan Rosenberg \u003cdrosenberg (at) vsecurity (dot) com\u003e \nVendor Status: Patch Released [2]\nCVE Candidate: CVE-2011-0180\n Reference: http://www.vsecurity.com/resources/advisory/20110322-1/\n\n- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-\n\n\nProduct Description\n- -------------------\n- From [1]:\n\n \"Beneath the appealing, easy-to-use interface of Mac OS X is a rock-solid,\n UNIX-based foundation that is engineered for stability, reliability, and\n performance. The kernel environment is built on top of Mach 3.0 and provides\n high-performance networking facilities and support for multiple, integrated\n file systems.\"\n\n\nVulnerability Overview\n- ----------------------\n\nOn June 30th, VSR identified a vulnerability in HFS+, a filesystem implemented\nin the OS X XNU kernel. By exploiting this\nvulnerability, an unprivileged user with local access to a machine using HFS+\nmay be able to read raw filesystem data, bypassing file permissions and\nresulting in information disclosure. \n\n\nVulnerability Details\n- ---------------------\n\nUsers may interact with the filesystem using the standard ioctl interface. The ioctl intends to ensure that this\ndata is restricted to the first 1024 bytes, where bootstrap information is\nstored. However, due to an integer overflow in the code that attempts to\nenforce this restriction, it is possible for an unprivileged user to use this\nioctl to read large portions of filesystem data outside of this byte range,\nleading to an information disclosure vulnerability. \n\nThe vulnerable check reads as follows, in bsd/hfs/hfs_readwrite.c:\n\nif (user_bootstrapp-\u003efbt_offset + user_bootstrapp-\u003efbt_length \u003e 1024)\n\treturn EINVAL;\n\nIf a user provides values for the fbt_offset and fbt_length members such that\ntheir sum overflows and wraps around to an integer less than 1024, portions of\nfilesystem data outside the intended range will be read and returned to the\nuser. \n\n\nProof-of-Concept Exploit\n- ------------------------\n\nVSR has developed a proof-of-concept exploit [3] to both demonstrate the\nseverity of this issue as well as allow users and administrators to verify the\nexistence of the vulnerability. \n\n\nVersions Affected\n- -----------------\nTesting was performed on Darwin Kernel Version 10.4.0, xnu-1504.7.4~1, but\nreview of older source code suggests that all versions of OS X may be affected. \n\n\nVendor Response\n- ---------------\nThe following timeline details Apple\u0027s response to the reported issue:\n\n2010-07-01 Apple was provided a draft advisory\n2010-07-02 Apple acknowledges receipt of advisory\n2010-07-22 Request for confirmation of issue\n2010-07-25 Apple confirms issue under investigation\n2010-09-02 Request for status update\n2010-09-02 Apple confirms fix is being tested\n2010-10-13 Request for status update\n2010-10-14 Apple confirms fix is planned for undetermined date\n2010-11-16 Request for status update\n2010-11-16 Apple confirms ship date is set for early 2011\n2011-01-18 Request for status update\n2011-01-18 Apple confirms ship date for early April\n2011-03-21 Apple publishes fix\n\nApple\u0027s advisory may be obtained at:\n http://support.apple.com/kb/HT4581\n\n\nRecommendation\n- --------------\nApply the fix provided by Apple\u0027s OS X security update [2]. \n\n\nCommon Vulnerabilities and Exposures (CVE) Information\n- ------------------------------------------------------\nThe Common Vulnerabilities and Exposures (CVE) project has assigned\nthe number CVE-2011-0180 to this issue. This is a candidate for\ninclusion in the CVE list (http://cve.mitre.org), which standardizes\nnames for security problems. \n\n\n- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-\n\nReferences:\n\n1. Darwin and Core Technologies \n http://developer.apple.com/mac/library/documentation/MacOSX/Conceptual/OSX_Technology_Overview/SystemTechnology/SystemTechnology.html \n\n2. HFS+ F_READBOOTSTRAP information disclosure exploit\n http://www.vsecurity.com/download/tools/hfs-dump.c\n\n- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-\n\nThis advisory is distributed for educational purposes only with the sincere \nhope that it will help promote public safety. This advisory comes with \nabsolutely NO WARRANTY; not even the implied warranty of merchantability or \nfitness for a particular purpose. Virtual Security Research, LLC nor the author \naccepts any liability for any direct, indirect, or consequential loss or damage\narising from use of, or reliance on, this information. \n\nSee the VSR disclosure policy for more information on our responsible disclosure\npractices:\n http://www.vsecurity.com/disclosurepolicy.html\n\n- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-\n Copyright 2011 Virtual Security Research, LLC. All rights reserved. \n\n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1.4.10 (GNU/Linux)\n\niEYEARECAAYFAk2IyTQACgkQQ1RSUNR+T+h13QCfaDJiFghrnF3/HLMdppiqP/Bq\nUrwAn3M/wbWRjXhp/oX1KLZo939FFhNv\n=pAH9\n-----END PGP SIGNATURE-----\n\n",
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.