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Message-ID: <CAFB=mGDy=dsiCAXdMF52E_W9x2pf0A2=j43z6joZrq4B1AxWnA@mail.gmail.com> Date: Sat, 3 Dec 2011 01:50:52 +0100 From: "HI-TECH ." <isowarez.isowarez.isowarez@...glemail.com> To: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com Subject: VSFTPD Remote Heap Overrun (low severity) This is afaik a patched CVE in Linux glibc [1] which can be triggered through the very secure ftp daemon [2] so it will only work on older linux distros. Be aware that vsftpd has privilege seperation built in so this bug will not yield a root shell. It could yield root only in junction with a linux kernel vulnerability because the attacker will not be able to break the chroot without being root. This bug has a low severity because it's hard to exploit. Linux systems without patched glibc are vulnerable even if the latest version vsftpd-2.3.4 is installed. The bug is in the glibc timezone code. vsftpd loads timezone files from /usr [3]. If the attacker is inside a chroot he can easily create this directory and the timezone file and trigger the heap overrun. A Debugging Session illustrating the bug can be found on youtube: http://www.youtube.com/watch?v=KRCuozBM_dQ Cheers! [1] http://dividead.wordpress.com/tag/heap-overflow/ [2] https://security.appspot.com/vsftpd.html [3] For example /usr/share/zoneinfo/UTC-01:00 /Kingcope _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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