| Name | CVE-2014-6278 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| bash (PTS) | buster | 5.0-4 | fixed |
| bullseye | 5.1-2+deb11u1 | fixed | |
| bookworm | 5.2.15-2 | fixed | |
| trixie, sid | 5.2.21-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| bash | source | squeeze | 4.1-3+deb6u2 | high | ||
| bash | source | wheezy | 4.2+dfsg-0.1+deb7u3 | high | ||
| bash | source | (unstable) | 4.3-9.2 | high |
Florian Weimer's variables-affix.patch patch applied in Debian prevents
exploitation of this issue by making bash only use environment variables
with specific names (BASH_FUNC_*()) to define functions from its
environment.