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Actively exploited · Published Sep 24, 2014 · Assigned by debian

CVE-2014-6271

Critical 9.8 Exploited

In plain English

A critical-severity OS command injection in Bourne-Again Shell (Bash) from GNU. Attackers are actively exploiting it in the wild (listed by CISA on January 28, 2022). The chance it is exploited in the next 30 days is estimated at 100.0% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)100.0%top 0.0% of all CVEs
Exploited in the wildYesCISA KEV since Jan 28, 2022
Attack tooling3Metasploit, Nuclei, Public PoC

CISA guidance

Apply updates per vendor instructions.

Federal agencies must remediate by Jul 28, 2022.

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12bash4.3-9.1DEBIAN-CVE-2014-6271
Debian:13bash4.3-9.1DEBIAN-CVE-2014-6271
Debian:14bash4.3-9.1DEBIAN-CVE-2014-6271

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References