GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute arbitrary code 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, aka “ShellShock.” NOTE: the original fix for this issue was incorrect; CVE-2014-7169 has been assigned to cover the vulnerability that is still present after the incorrect fix.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-6271
Reference (s):
- APPLE:APPLE-SA-2014-10-16-1
- URL: http://archives.neohapsis.com/archives/bugtraq/2014-10/0101.html
- BID:70103
- URL: http://www.securityfocus.com/bid/70103
- BUGTRAQ:20141001 NEW VMSA-2014-0010 – VMware product updates address critical Bash security vulnerabilities