var-201710-1359
Vulnerability from variot
An issue was discovered in certain Apple products. iOS before 11 is affected. tvOS before 11 is affected. watchOS before 4 is affected. The issue involves the "Wi-Fi" component. It might allow remote attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via crafted Wi-Fi traffic. Apple iOS, WatchOS and tvOS are prone to multiple memory corruption and security-bypass vulnerabilities. Attackers can exploit these issues to execute arbitrary code and perform unauthorized actions. Failed exploit attempts may result in a denial-of-service condition. The following versions are affected: Versions prior to Apple iOS 11 Versions prior to Apple watchOS 4 Versions prior to Apple tvOS 11. Apple: Heap overflow and information disclosure in "setVendorIE" when handling ioctl results
CVE-2017-7110
Broadcom produces Wi-Fi HardMAC SoCs which are used to handle the PHY and MAC layer processing. These chips are present in both mobile devices and Wi-Fi routers, and are capable of handling many Wi-Fi related events without delegating to the host OS. On iOS, the "AppleBCMWLANBusInterfacePCIe" driver is used in order to handle the PCIe interface and low-level communication protocols with the Wi-Fi SoC (also referred to as "dongle"). Similarly, the "AppleBCMWLANCore" driver handles the high-level protocols and the Wi-Fi configuration.
Along with the regular flow of frames transferred between the host and the dongle, the two communicate with one another via a set of "ioctls" which can be issued to read or write dongle configuration from the host. This information is exchanged using the "Control Completion" ring, rather than the regular "RX" ring.
When handling certain events such as setting up an access-point, the Wi-Fi chip must be configured to broadcast new information elements for the created network. This is achieved by calling the "setVendorIE" function, which supplies the firmware with a new vendor-specified information element.
Before the information element can be added, the driver must first ensure that no previous IE with the same tag and data has already been configured. This is done by querying the Wi-Fi chip for the current list of Vendor IEs. Each IE's tag and contents are compared to the newly provided IE -- if a match is found, the function issues an additional ioctl to the Wi-Fi chip in order to request that the previous IE be deleted.
The list of IEs returned by the Wi-Fi firmware starts with a 32-bit "count" field, indicating the number of IEs in the list. Each IE is a TLV, where the "tag" and the "length" are both 8-bits fields. Here is a snippet of the approximate high-level code for "setVendorIE":
uint64_t setVendorIE(void this, void new_ie) {
...
//Extracting some information about the new IE uint8_t new_ie_buffer = ((uint8_t)new_ie + 3); uint32_t new_ie_length = ((uint32_t)new_ie + 4); uint8_t new_ie_tag = new_ie_buffer[0]; ...
//Reading the Vendor IE list from the firmware - the IOVar is "vndr_ie" uint8_t vendor_ie_list = (uint8_t)IOMalloc(...); uint64_t res = issueCommand(..., &vendor_ie_list, ...);
//Searching for a matching IE uint32_t count = ((uint32_t)vendor_ie_list); uint8_t* current_ie = vendor_ie_list + sizeof(uint32_t); if (count >= 1) { for (uint32_t i=0; i<count; i++, current_ie += 4) {
//Is this a matching IE?
if (current_ie[8] == new_ie_tag &&
new_ie_length != 1 &&
!bcmp(new_ie + 1, current_ie + 10, new_ie_length-1)) {
//Found a match! Ask the firmware to delete the old IE
void* ie_buffer = IOMalloc(new_ie_length + 13);
strlcpy(ie_buffer, "del", 4);
*(uint32_t*)(ie_buffer + 4) = 1;
ovbcopy(current_ie + 4, ie_buffer + 8, current_ie[9] + 6);
issueCommand(...); //Send the deletion request
...
}
}
...
} ... }
As can be seen above, "setVendorIE" fails to verify both the "count" field in the returned IE list, and the length of each individual IE. As a result, an attacker controlling the firmware may choose arbitrarily large values for these fields.
For example, an attacker controlling the firmware could return a list containing an IE with the same tag and payload bytes as the IE being set, but with a large length field (larger than the previous IE's length + 13). Doing so will cause the match above to succeed (as it only compares the contents up to the new IE's length), but will then trigger the "obvcopy" using the attacker-controlled IE length (current_ie[9] + 6), thus overflowing the heap-allocated buffer (ie_buffer).
Alternately, an attacker may choose to supply a large "count" field. Doing so will cause the loop above to read data past the end of the buffer containing the ioctl's results. If, at any point, a sequence of bytes matching the new vendor IE is encountered, the matching conditions above will be satisfied. An attacker can use this as an "oracle" to leak information from the host by spraying sequences containing the vendor IE's contents and slowly incrementing the "count" field. When a match occurs, the driver will issue the deletion ioctl to the firmware, allowing the firmware to deduce that a match occurred at the current offset.
This bug is subject to a 90 day disclosure deadline. After 90 days elapse or a patch has been made broadly available, the bug report will become visible to the public.
Found by: laginimaineb
. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512
APPLE-SA-2017-09-25-5 Additional information for APPLE-SA-2017-09-20-2 watchOS 4
watchOS 4 addresses the following:
CFNetwork Proxies Available for: All Apple Watch models Impact: An attacker in a privileged network position may be able to cause a denial of service Description: Multiple denial of service issues were addressed through improved memory handling. CVE-2017-7083: Abhinav Bansal of Zscaler Inc. Entry added September 25, 2017
CoreAudio Available for: All Apple Watch models Impact: An application may be able to read restricted memory Description: An out-of-bounds read was addressed by updating to Opus version 1.1.4. CVE-2017-0381: V.E.O (@VYSEa) of Mobile Threat Research Team, Trend Micro Entry added September 25, 2017
Kernel Available for: All Apple Watch models Impact: An application may be able to execute arbitrary code with kernel privileges Description: A memory corruption issue was addressed with improved memory handling. CVE-2017-7114: Alex Plaskett of MWR InfoSecurity Entry added September 25, 2017
libc Available for: All Apple Watch models Impact: A remote attacker may be able to cause a denial-of-service Description: A resource exhaustion issue in glob() was addressed through an improved algorithm. CVE-2017-7086: Russ Cox of Google Entry added September 25, 2017
libc Available for: All Apple Watch models Impact: An application may be able to cause a denial of service Description: A memory consumption issue was addressed through improved memory handling. CVE-2017-1000373 Entry added September 25, 2017
libexpat Available for: All Apple Watch models Impact: Multiple issues in expat Description: Multiple issues were addressed by updating to version 2.2.1 CVE-2016-9063 CVE-2017-9233 Entry added September 25, 2017
Security Available for: All Apple Watch models Impact: A revoked certificate may be trusted Description: A certificate validation issue existed in the handling of revocation data. This issue was addressed through improved validation. CVE-2017-7080: an anonymous researcher, Sven Driemecker of adesso mobile solutions gmbh, an anonymous researcher, Rune Darrud (@theflyingcorpse) of BA|rum kommune Entry added September 25, 2017
SQLite Available for: All Apple Watch models Impact: Multiple issues in SQLite Description: Multiple issues were addressed by updating to version 3.19.3. CVE-2017-10989: found by OSS-Fuzz CVE-2017-7128: found by OSS-Fuzz CVE-2017-7129: found by OSS-Fuzz CVE-2017-7130: found by OSS-Fuzz Entry added September 25, 2017
SQLite Available for: All Apple Watch models Impact: An application may be able to execute arbitrary code with system privileges Description: A memory corruption issue was addressed with improved memory handling. CVE-2017-7103: Gal Beniamini of Google Project Zero CVE-2017-7105: Gal Beniamini of Google Project Zero CVE-2017-7108: Gal Beniamini of Google Project Zero CVE-2017-7110: Gal Beniamini of Google Project Zero CVE-2017-7112: Gal Beniamini of Google Project Zero
Wi-Fi Available for: All Apple Watch models Impact: Malicious code executing on the Wi-Fi chip may be able to read restricted kernel memory Description: A validation issue was addressed with improved input sanitization. CVE-2017-7116: Gal Beniamini of Google Project Zero
zlib Available for: All Apple Watch models Impact: Multiple issues in zlib Description: Multiple issues were addressed by updating to version 1.2.11. CVE-2016-9840 CVE-2016-9841 CVE-2016-9842 CVE-2016-9843 Entry added September 25, 2017
Additional recognition
Security We would like to acknowledge Abhinav Bansal of Zscaler, Inc. for their assistance.
Installation note:
Instructions on how to update your Apple Watch software are available at https://support.apple.com/kb/HT204641
To check the version on your Apple Watch, open the Apple Watch app on your iPhone and select "My Watch > General > About".
Alternatively, on your watch, select "My Watch > General > About".
Information will also be posted to the Apple Security Updates web site: https://support.apple.com/kb/HT201222
This message is signed with Apple's Product Security PGP key, and details are available at: https://www.apple.com/support/security/pgp/ -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org
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"data": "An issue was discovered in certain Apple products. iOS before 11 is affected. tvOS before 11 is affected. watchOS before 4 is affected. The issue involves the \"Wi-Fi\" component. It might allow remote attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via crafted Wi-Fi traffic. Apple iOS, WatchOS and tvOS are prone to multiple memory corruption and security-bypass vulnerabilities. \nAttackers can exploit these issues to execute arbitrary code and perform unauthorized actions. Failed exploit attempts may result in a denial-of-service condition. \nThe following versions are affected:\nVersions prior to Apple iOS 11\nVersions prior to Apple watchOS 4\nVersions prior to Apple tvOS 11. Apple: Heap overflow and information disclosure in \"setVendorIE\" when handling ioctl results \n\nCVE-2017-7110\n\n\nBroadcom produces Wi-Fi HardMAC SoCs which are used to handle the PHY and MAC layer processing. These chips are present in both mobile devices and Wi-Fi routers, and are capable of handling many Wi-Fi related events without delegating to the host OS. On iOS, the \"AppleBCMWLANBusInterfacePCIe\" driver is used in order to handle the PCIe interface and low-level communication protocols with the Wi-Fi SoC (also referred to as \"dongle\"). Similarly, the \"AppleBCMWLANCore\" driver handles the high-level protocols and the Wi-Fi configuration. \n\nAlong with the regular flow of frames transferred between the host and the dongle, the two communicate with one another via a set of \"ioctls\" which can be issued to read or write dongle configuration from the host. This information is exchanged using the \"Control Completion\" ring, rather than the regular \"RX\" ring. \n\nWhen handling certain events such as setting up an access-point, the Wi-Fi chip must be configured to broadcast new information elements for the created network. This is achieved by calling the \"setVendorIE\" function, which supplies the firmware with a new vendor-specified information element. \n\nBefore the information element can be added, the driver must first ensure that no previous IE with the same tag and data has already been configured. This is done by querying the Wi-Fi chip for the current list of Vendor IEs. Each IE\u0027s tag and contents are compared to the newly provided IE -- if a match is found, the function issues an additional ioctl to the Wi-Fi chip in order to request that the previous IE be deleted. \n\nThe list of IEs returned by the Wi-Fi firmware starts with a 32-bit \"count\" field, indicating the number of IEs in the list. Each IE is a TLV, where the \"tag\" and the \"length\" are both 8-bits fields. Here is a snippet of the approximate high-level code for \"setVendorIE\":\n\nuint64_t setVendorIE(void* this, void* new_ie) {\n\n ... \n\n //Extracting some information about the new IE\n uint8_t* new_ie_buffer = *((uint8_t**)new_ie + 3);\n uint32_t new_ie_length = *((uint32_t*)new_ie + 4);\n uint8_t new_ie_tag = new_ie_buffer[0];\n ... \n\n //Reading the Vendor IE list from the firmware - the IOVar is \"vndr_ie\"\n uint8_t* vendor_ie_list = (uint8_t*)IOMalloc(...);\n uint64_t res = issueCommand(..., \u0026vendor_ie_list, ...); \n\n //Searching for a matching IE\n uint32_t count = *((uint32_t*)vendor_ie_list);\n uint8_t* current_ie = vendor_ie_list + sizeof(uint32_t);\n if (count \u003e= 1) {\n for (uint32_t i=0; i\u003ccount; i++, current_ie += 4) {\n\n //Is this a matching IE?\n if (current_ie[8] == new_ie_tag \u0026\u0026\n new_ie_length != 1 \u0026\u0026 \n !bcmp(new_ie + 1, current_ie + 10, new_ie_length-1)) {\n\n //Found a match! Ask the firmware to delete the old IE\n void* ie_buffer = IOMalloc(new_ie_length + 13);\n strlcpy(ie_buffer, \"del\", 4);\n *(uint32_t*)(ie_buffer + 4) = 1;\n ovbcopy(current_ie + 4, ie_buffer + 8, current_ie[9] + 6);\n issueCommand(...); //Send the deletion request\n ... \n }\n }\n ... \n }\n ... \n}\n\nAs can be seen above, \"setVendorIE\" fails to verify both the \"count\" field in the returned IE list, and the length of each individual IE. As a result, an attacker controlling the firmware may choose arbitrarily large values for these fields. \n\nFor example, an attacker controlling the firmware could return a list containing an IE with the same tag and payload bytes as the IE being set, but with a large length field (larger than the previous IE\u0027s length + 13). Doing so will cause the match above to succeed (as it only compares the contents up to the new IE\u0027s length), but will then trigger the \"obvcopy\" using the attacker-controlled IE length (current_ie[9] + 6), thus overflowing the heap-allocated buffer (ie_buffer). \n\nAlternately, an attacker may choose to supply a large \"count\" field. Doing so will cause the loop above to read data past the end of the buffer containing the ioctl\u0027s results. If, at any point, a sequence of bytes matching the new vendor IE is encountered, the matching conditions above will be satisfied. An attacker can use this as an \"oracle\" to leak information from the host by spraying sequences containing the vendor IE\u0027s contents and slowly incrementing the \"count\" field. When a match occurs, the driver will issue the deletion ioctl to the firmware, allowing the firmware to deduce that a match occurred at the current offset. \n\nThis bug is subject to a 90 day disclosure deadline. After 90 days elapse\nor a patch has been made broadly available, the bug report will become\nvisible to the public. \n\n\n\nFound by: laginimaineb\n\n. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA512\n\nAPPLE-SA-2017-09-25-5\nAdditional information for APPLE-SA-2017-09-20-2 watchOS 4\n\nwatchOS 4 addresses the following:\n\nCFNetwork Proxies\nAvailable for: All Apple Watch models\nImpact: An attacker in a privileged network position may be able to\ncause a denial of service\nDescription: Multiple denial of service issues were addressed through\nimproved memory handling. \nCVE-2017-7083: Abhinav Bansal of Zscaler Inc. \nEntry added September 25, 2017\n\nCoreAudio\nAvailable for: All Apple Watch models\nImpact: An application may be able to read restricted memory\nDescription: An out-of-bounds read was addressed by updating to Opus\nversion 1.1.4. \nCVE-2017-0381: V.E.O (@VYSEa) of Mobile Threat Research Team, Trend\nMicro\nEntry added September 25, 2017\n\nKernel\nAvailable for: All Apple Watch models\nImpact: An application may be able to execute arbitrary code with\nkernel privileges\nDescription: A memory corruption issue was addressed with improved\nmemory handling. \nCVE-2017-7114: Alex Plaskett of MWR InfoSecurity\nEntry added September 25, 2017\n\nlibc\nAvailable for: All Apple Watch models\nImpact: A remote attacker may be able to cause a denial-of-service\nDescription: A resource exhaustion issue in glob() was addressed\nthrough an improved algorithm. \nCVE-2017-7086: Russ Cox of Google\nEntry added September 25, 2017\n\nlibc\nAvailable for: All Apple Watch models\nImpact: An application may be able to cause a denial of service\nDescription: A memory consumption issue was addressed through\nimproved memory handling. \nCVE-2017-1000373\nEntry added September 25, 2017\n\nlibexpat\nAvailable for: All Apple Watch models\nImpact: Multiple issues in expat\nDescription: Multiple issues were addressed by updating to version\n2.2.1\nCVE-2016-9063\nCVE-2017-9233\nEntry added September 25, 2017\n\nSecurity\nAvailable for: All Apple Watch models\nImpact: A revoked certificate may be trusted\nDescription: A certificate validation issue existed in the handling\nof revocation data. This issue was addressed through improved\nvalidation. \nCVE-2017-7080: an anonymous researcher, Sven Driemecker of adesso\nmobile solutions gmbh, an anonymous researcher, Rune Darrud\n(@theflyingcorpse) of BA|rum kommune\nEntry added September 25, 2017\n\nSQLite\nAvailable for: All Apple Watch models\nImpact: Multiple issues in SQLite\nDescription: Multiple issues were addressed by updating to version\n3.19.3. \nCVE-2017-10989: found by OSS-Fuzz\nCVE-2017-7128: found by OSS-Fuzz\nCVE-2017-7129: found by OSS-Fuzz\nCVE-2017-7130: found by OSS-Fuzz\nEntry added September 25, 2017\n\nSQLite\nAvailable for: All Apple Watch models\nImpact: An application may be able to execute arbitrary code with\nsystem privileges\nDescription: A memory corruption issue was addressed with improved\nmemory handling. \nCVE-2017-7103: Gal Beniamini of Google Project Zero\nCVE-2017-7105: Gal Beniamini of Google Project Zero\nCVE-2017-7108: Gal Beniamini of Google Project Zero\nCVE-2017-7110: Gal Beniamini of Google Project Zero\nCVE-2017-7112: Gal Beniamini of Google Project Zero\n\nWi-Fi\nAvailable for: All Apple Watch models\nImpact: Malicious code executing on the Wi-Fi chip may be able to\nread restricted kernel memory\nDescription: A validation issue was addressed with improved input\nsanitization. \nCVE-2017-7116: Gal Beniamini of Google Project Zero\n\nzlib\nAvailable for: All Apple Watch models\nImpact: Multiple issues in zlib\nDescription: Multiple issues were addressed by updating to version\n1.2.11. \nCVE-2016-9840\nCVE-2016-9841\nCVE-2016-9842\nCVE-2016-9843\nEntry added September 25, 2017\n\nAdditional recognition\n\nSecurity\nWe would like to acknowledge Abhinav Bansal of Zscaler, Inc. \nfor their assistance. \n\nInstallation note:\n\nInstructions on how to update your Apple Watch software are\navailable at https://support.apple.com/kb/HT204641\n\nTo check the version on your Apple Watch, open the Apple Watch app\non your iPhone and select \"My Watch \u003e General \u003e About\". \n\nAlternatively, on your watch, select \"My Watch \u003e General \u003e About\". \n\nInformation will also be posted to the Apple Security Updates\nweb site: https://support.apple.com/kb/HT201222\n\nThis message is signed with Apple\u0027s Product Security PGP key,\nand details are available at:\nhttps://www.apple.com/support/security/pgp/\n-----BEGIN PGP SIGNATURE-----\nComment: GPGTools - https://gpgtools.org\n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\n39wnv7L2yjedzyd+/y5E\n=ACi9\n-----END PGP SIGNATURE-----\n\n\n\n",
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Loading…
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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.
- 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.