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Published: 27 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 code or cause a denial of service (uninitialized memory access, and untrusted-pointer read and write operations) 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 and CVE-2014-7169.




Package Release Status
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 14.04 ESM (Trusty Tahr)
Released (4.3-7ubuntu1.5)


this issue is mitigated by Florian Weimer's prefix-suffix patch
that is included in
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.