var-200705-0151
Vulnerability from variot

The PPP daemon (pppd) in Apple Mac OS X 10.4.8 checks ownership of the stdin file descriptor to determine if the invoker has sufficient privileges, which allows local users to load arbitrary plugins and gain root privileges by bypassing this check. A vulnerabilty in the way Apple Mac OS X iChat handles specially crafted UPnP packets may allow execution of arbitrary code or denial of service. Apple Mac OS X is prone to multiple security vulnerabilities. These issues affect Mac OS X and various applications, including Alias Manager, CoreGraphics, crontabs, iChat, and PPP. Attackers may exploit these issues to execute arbitrary code, trigger denial-of-service conditions, escalate privileges, and potentially compromise vulnerable computers. Both local and remote vulnerabilities are present. Apple Mac OS X 10.4.9 and prior versions are vulnerable to these issues. BACKGROUND

Apple Mac OS X pppd is a setuid root application that is used to establish and configure connections for point to point links. It is commonly used for configuring traditional dial-up modem and DSL connections. More information can be found at the following URL.

http://developer.apple.com/documentation/Darwin/Reference/Manpages/man8/pppd.8.html

II.

The vulnerability exists due to insufficient access validation when processing the "plugin" command line option. The application does not properly verify that the requesting user has root privileges and allows any user to load plug-ins.

When checking to see if the executing user has root privileges, a check is made to see if the stdin file descriptor is owned by root. Passing this check is trivial and allows the attacker to load arbitrary plug-ins resulting in arbitrary code execution with root privileges.

III. ANALYSIS

Exploitation is trivial and grants root access.

This vulnerability cannot be triggered remotely; an attacker needs local access to the victim's system in order to exploit this vulnerability. pppd is installed by default.

IV. Other versions may also be affected.

V. WORKAROUND

Remove the setuid bit from the pppd binary. This will prevent users without root privileges from being able to properly use the program.

VI. VENDOR RESPONSE

Apple Inc has addressed this vulnerability in Apple Security Update 2007-005. More information can be found from Apple's Security Update page or the Security Update 2007-005 advisory page at the respective URLs below.

http://docs.info.apple.com/article.html?artnum=61798 http://docs.info.apple.com/article.html?artnum=305530

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-0752 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

VIII. DISCLOSURE TIMELINE

01/08/2007 Initial vendor notification 01/09/2007 Initial vendor response 05/24/2007 Coordinated public disclosure

IX. CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

Get paid for vulnerability research http://labs.idefense.com/methodology/vulnerability/vcp.php

Free tools, research and upcoming events http://labs.idefense.com/

X. LEGAL NOTICES

Copyright \xa9 2007 iDefense, Inc.

Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customerservice@idefense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information

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    "data": "The PPP daemon (pppd) in Apple Mac OS X 10.4.8 checks ownership of the stdin file descriptor to determine if the invoker has sufficient privileges, which allows local users to load arbitrary plugins and gain root privileges by bypassing this check. A vulnerabilty in the way Apple Mac OS X iChat handles specially crafted UPnP packets may allow execution of arbitrary code or denial of service. Apple Mac OS X is prone to multiple security vulnerabilities. \nThese issues affect Mac OS X and various applications, including Alias Manager, CoreGraphics, crontabs, iChat, and PPP. \nAttackers may exploit these issues to execute arbitrary code, trigger denial-of-service conditions, escalate privileges, and potentially compromise vulnerable computers. Both local and remote vulnerabilities are present. \nApple Mac OS X 10.4.9 and prior versions are vulnerable to these issues. BACKGROUND\n\nApple Mac OS X pppd is a setuid root application that is used to\nestablish and configure connections for point to point links. It is\ncommonly used for configuring traditional dial-up modem and DSL\nconnections. More information can be found at the following URL. \n\nhttp://developer.apple.com/documentation/Darwin/Reference/Manpages/man8/pppd.8.html\n\nII. \n\nThe vulnerability exists due to insufficient access validation when\nprocessing the \"plugin\" command line option. The application does not\nproperly verify that the requesting user has root privileges and allows\nany user to load plug-ins. \n\nWhen checking to see if the executing user has root privileges, a check\nis made to see if the stdin file descriptor is owned by root. Passing\nthis check is trivial and allows the attacker to load arbitrary\nplug-ins resulting in arbitrary code execution with root privileges. \n\nIII. ANALYSIS\n\nExploitation is trivial and grants root access. \n\nThis vulnerability cannot be triggered remotely; an attacker needs local\naccess to the victim\u0027s system in order to exploit this vulnerability. \npppd is installed by default. \n\nIV. Other versions may also be affected. \n\nV. WORKAROUND\n\nRemove the setuid bit from the pppd binary. This will prevent users\nwithout root privileges from being able to properly use the program. \n\nVI. VENDOR RESPONSE\n\nApple Inc has addressed this vulnerability in Apple Security Update\n2007-005. More information can be found from Apple\u0027s Security Update\npage or the Security Update 2007-005 advisory page at the respective\nURLs below. \n\nhttp://docs.info.apple.com/article.html?artnum=61798\nhttp://docs.info.apple.com/article.html?artnum=305530\n\nVII. CVE INFORMATION\n\nThe Common Vulnerabilities and Exposures (CVE) project has assigned the\nname CVE-2007-0752 to this issue. This is a candidate for inclusion in\nthe CVE list (http://cve.mitre.org/), which standardizes names for\nsecurity problems. \n\nVIII. DISCLOSURE TIMELINE\n\n01/08/2007  Initial vendor notification\n01/09/2007  Initial vendor response\n05/24/2007  Coordinated public disclosure\n\nIX. CREDIT\n\nThe discoverer of this vulnerability wishes to remain anonymous. \n\nGet paid for vulnerability research\nhttp://labs.idefense.com/methodology/vulnerability/vcp.php\n\nFree tools, research and upcoming events\nhttp://labs.idefense.com/\n\nX. LEGAL NOTICES\n\nCopyright \\xa9 2007 iDefense, Inc. \n\nPermission is granted for the redistribution of this alert\nelectronically. It may not be edited in any way without the express\nwritten consent of iDefense. If you wish to reprint the whole or any\npart of this alert in any other medium other than electronically,\nplease e-mail customerservice@idefense.com for permission. \n\nDisclaimer: The information in the advisory is believed to be accurate\nat the time of publishing based on currently available information. Use\nof the information constitutes acceptance for use in an AS IS condition. \n There are no warranties with regard to this information. Neither the\nauthor nor the publisher accepts any liability for any direct,\nindirect, or consequential loss or damage arising from use of, or\nreliance on, this information",
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