Environmental Variable Command Injection in GNU Bash by GNU
CVE-2014-7169

9.8CRITICAL

Key Information:

Vendor: Gnu
Status: Bash
Vendor: CVE Published:; 25 September 2014

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 88%🦅 CISA Reported

Summary

The vulnerability in GNU Bash through version 4.3 allows attackers to exploit malformed function definitions in environment variables. This can lead to unauthorized writing to files or other impacts, particularly through methods that involve privilege boundaries. Notable examples of exploitation can occur in setups utilizing OpenSSH's ForceCommand, Apache's mod_cgi and mod_cgid modules, or through scripts executed by specific DHCP clients and various scenarios where environment variables are set aside from Bash execution. This risk arises from an incomplete patch of a previous vulnerability.

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-2014-7169 - Proof of Concept

bash-shellshock
Created by chef-boneyard

SHELL-SCHOCK
Created by Gobinath-B