CVE-2021-45463 : Security Advisory and Response

GEGL before 0.4.34 allows shell expansion, potentially enabling arbitrary command execution. This vulnerability affects GEGL and GIMP software.

Understanding CVE-2021-45463

What is CVE-2021-45463?

GEGL's load_cache function before version 0.4.34 is susceptible to shell expansion due to unescaped pathnames in command lines, potentially leading to unauthorized command execution.

The Impact of CVE-2021-45463

This vulnerability could be exploited by attackers to execute arbitrary commands through specially crafted image files, leading to unauthorized access, data theft, or further compromise of affected systems.

Technical Details of CVE-2021-45463

Vulnerability Description

The issue arises from the improper handling of pathnames in a constructed command line, allowing for shell expansion and subsequent execution of arbitrary commands.

Affected Systems and Versions

GEGL versions before 0.4.34
GIMP releases before 2.10.30

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious image files with specially designed pathnames to trigger shell expansion and execute unauthorized commands.

Mitigation and Prevention

Immediate Steps to Take

Update GEGL to version 0.4.34 or later.
Update GIMP to version 2.10.30 or newer.
Avoid opening untrusted image files from unknown sources.

Long-Term Security Practices

Regularly update and patch software to mitigate known vulnerabilities.
Implement restrictive file system permissions to limit the impact of potential exploits.
Conduct regular security audits and vulnerability assessments.

Patching and Updates

Apply patches provided by GEGL and GIMP to address the vulnerability and prevent exploitation.