critical
10
CWE
78
Advisory Published
Updated

CVE-2014-6277: OS Command Injection

First published: Sat Sep 27 2014(Updated: )

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.

Credit: security@debian.org

Affected SoftwareAffected VersionHow to fix
GNU Bash=1.14.0
GNU Bash=1.14.1
GNU Bash=1.14.2
GNU Bash=1.14.3
GNU Bash=1.14.4
GNU Bash=1.14.5
GNU Bash=1.14.6
GNU Bash=1.14.7
GNU Bash=2.0
GNU Bash=2.01
GNU Bash=2.01.1
GNU Bash=2.02
GNU Bash=2.02.1
GNU Bash=2.03
GNU Bash=2.04
GNU Bash=2.05
GNU Bash=2.05-a
GNU Bash=2.05-b
GNU Bash=3.0
GNU Bash=3.0.16
GNU Bash=3.1
GNU Bash=3.2
GNU Bash=3.2.48
GNU Bash=4.0
GNU Bash=4.0-rc1
GNU Bash=4.1
GNU Bash=4.2
GNU Bash=4.3

Remedy

http://lcamtuf.blogspot.com/2014/09/bash-bug-apply-unofficial-patch-now.html

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2014-6277?

    CVE-2014-6277 is classified as a critical vulnerability due to its potential to allow arbitrary code execution.

  • How do I fix CVE-2014-6277?

    To fix CVE-2014-6277, update GNU Bash to version 4.3 or later.

  • What versions of GNU Bash are affected by CVE-2014-6277?

    All versions of GNU Bash prior to 4.3 are affected by CVE-2014-6277.

  • What type of attacks can CVE-2014-6277 enable?

    CVE-2014-6277 can enable remote attackers to execute arbitrary code or create denial of service conditions.

  • Is CVE-2014-6277 exploitable through environment variables?

    Yes, CVE-2014-6277 is exploitable through improperly parsed function definitions in the values of environment variables.

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