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Credit:
The information has been provided by iDefense.
The original article can be found at:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=537
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Vulnerable Systems:
* pppd in version 10.4.8 of Mac OS X.
* Other versions may also be affected.
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.
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.
Workaround:
Remove the setuid bit from the pppd binary. This will prevent users without root privileges from being able to properly use the program.
Vendor Status:
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
CVE Information:
CVE-2007-0752
Disclosure Timeline:
* 01/08/2007 - Initial vendor notification
* 01/09/2007 - Initial vendor response
* 05/24/2007 - Coordinated public disclosure
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