CVE-2014-6271

Publication date 24 September 2014

Last updated 21 August 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
bash	14.04 LTS trusty	Fixed 4.3-7ubuntu1.1
	12.04 LTS precise	Fixed 4.2-2ubuntu2.2
	10.04 LTS lucid	Fixed 4.1-2ubuntu3.1

Notes

mdeslaur

After updates were released for this issue, it was discovered that the fix was incomplete. The new issue is being tracked as CVE-2014-7169.

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-2362-1
Bash vulnerability
24 September 2014