Code Injection Vulnerability in GNU Bash by The GNU Project
CVE-2014-6271

9.8CRITICAL

Key Information:

Vendor: Gnu
Status: Bash
Vendor: CVE Published:; 24 September 2014

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 94%🦅 CISA Reported

Summary

GNU Bash versions up to 4.3 are vulnerable to a code injection flaw due to the mishandling of trailing strings after function definitions in environment variables. This vulnerability enables remote attackers to execute arbitrary code by crafting specific environment variables under various conditions, including through OpenSSH's ForceCommand feature, Apache HTTP Server's mod_cgi and mod_cgid modules, as well as scripts executed by various DHCP clients. The improper handling allows for malicious exploits that can breach privilege boundaries and lead to unauthorized command execution.

CISA Reported

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: Apply updates per vendor instructions.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2014-6271 - Proof of Concept