This vulnerability enables an attacker to get elevated privileges on a local machine. There have been several exploits released and we can confirm that they work. We've tested this on unpatched SuSE and RedHat Enterprise Linux machines:
prctl() suidsafe exploit
(C) Julien TINNES
[+] Installed signal handler
[+] We are suidsafe dumpable!
[+] Malicious string forged
[+] Segfaulting child
[+] Waiting for exploit to succeed (~28 seconds)
[+] getting root shell
Debian also confirmed that this exploit was used on their recently compromised machine (http://isc.sans.org/diary.php?storyid=1479).
As all kernels 2.6.13 up to version 220.127.116.11 and 2.6.16 before 18.104.22.168 are affected, you should patch as soon as possible, even if you don't allow any local users on your machines. Remember that even a small vulnerability in a PHP script can allow local access, which then can be escalated with this exploit.
CVE for this vulnerability has also been issued: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2451.
Thanks to David Taylor for sending information about this to us.
I will be teaching next: Web App Penetration Testing and Ethical Hacking - SANS Brussels September 2019
Jul 13th 2006
1 decade ago