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CVE-2012-3410

Published: 27 August 2012

Stack-based buffer overflow in lib/sh/eaccess.c in GNU Bash before 4.2 patch 33 might allow local users to bypass intended restricted shell access via a long filename in /dev/fd, which is not properly handled when expanding the /dev/fd prefix.

Notes

AuthorNote
jdstrand
reproducer in oss thread
verified that compiler hardening blocks this on all releases
(-D_FORTIFY_SOURCE=2 on 10.04 LTS+ and -fstack-protector on 8.04 LTS)
mdeslaur
since this gets blocked, it is not a security issue. Ignoring.

Priority

Negligible

Status

Package Release Status
bash
Launchpad, Ubuntu, Debian
hardy Ignored
(end of life)
lucid Ignored

natty Ignored
(end of life)
oneiric Ignored
(end of life)
precise Ignored

quantal Not vulnerable
(4.2-4ubuntu1)
raring Not vulnerable
(4.2-4ubuntu1)
saucy Not vulnerable
(4.2-4ubuntu1)
trusty Not vulnerable
(4.2-4ubuntu1)
upstream
Released (4.2-4)
Patches:
other: ftp://ftp.gnu.org/pub/gnu/bash/bash-4.2-patches/bash42-033
This vulnerability is mitigated in part by the use of -D_FORTIFY_SOURCE=2 in Ubuntu.