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CVE-2014-6271

GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute…

Critical Known exploited
Severity
9.8 / 10
Critical · CVSS 3.1
Exploit chance (EPSS)
100.00%
Chance of exploitation in the next 30 days. Higher than 99.99% of scored vulnerabilities.
Known exploited
Yes
In CISA's catalog since Jan 28, 2022
Weakness
—
Not classified
Fix
None yet
No fixed version published
Exploited in the wild. GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability (GNU Bourne-Again Shell (Bash)). Required action: Apply updates per vendor instructions. Due for U.S. federal agencies by Jul 28, 2022.

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.

How to fix

No fixed version has been published yet. Until one is, remove or replace the package, or turn off or isolate the affected feature. This page updates when a fix ships.

Severity breakdown

CVSS 3.1 9.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

References

Advisories

Fixes and patches

Issue reports

Timeline

  1. Published
  2. Added to CISA's Known Exploited Vulnerabilities catalog
  3. Remediation due for U.S. federal agencies
  4. Last updated by the source
  5. Latest EPSS score
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