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CVE-2014-6278

Published: 30 September 2014

GNU Bash through 4.3 bash43-026 does not properly parse function definitions in the values of environment variables, which allows remote attackers to execute arbitrary commands via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in the Apache HTTP Server, scripts executed by unspecified DHCP clients, and other situations in which setting the environment occurs across a privilege boundary from Bash execution. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-6271, CVE-2014-7169, and CVE-2014-6277.

Priority

Medium

Status

Package Release Status
bash
Launchpad, Ubuntu, Debian
lucid
Released (4.1-2ubuntu3.5)
precise
Released (4.2-2ubuntu2.6)
trusty
Released (4.3-7ubuntu1.5)
upstream Needs triage

Notes

AuthorNote
mdeslaur
this issue is mitigated by Florian Weimer's prefix-suffix patch
that is included in https://ubuntu.com/security/notices/USN-2364-1
since bash parser vulnerabilities are now limited to specially
named environment variables, and as such are no longer directly
exposed to CGI scripts, SSH, etc.

Once an upstream patch is made available, we will release bash
updates, but we don't consider this to be a critical issue
requiring immediate attention.

References