CVE-2022-45063 : Security Advisory and Response

A critical vulnerability has been identified in xterm before version 375, allowing malicious actors to execute arbitrary code through font operations. This CVE was published on November 10, 2022, by MITRE.

Understanding CVE-2022-45063

This section will provide an overview of the vulnerability present in xterm versions prior to 375.

What is CVE-2022-45063?

The CVE-2022-45063 vulnerability in xterm before version 375 enables threat actors to trigger code execution by exploiting font operations. An attacker could leverage this flaw to execute commands within the vi line-editing mode of Zsh, primarily through an OSC 50 response containing Ctrl-g.

The Impact of CVE-2022-45063

Due to this vulnerability, unauthorized parties can execute arbitrary commands, potentially leading to system compromise and data exfiltration. Note that font operations are typically restricted in default xterm configurations on various Linux distributions.

Technical Details of CVE-2022-45063

In this section, we delve into the specifics of the vulnerability, including affected systems and the exploitation mechanism.

Vulnerability Description

The security flaw in xterm versions before 375 arises from improper validation of font operations, allowing attackers to embed malicious commands that may be executed in the Zsh line-editing mode.

Affected Systems and Versions

All versions of xterm before 375 are affected by CVE-2022-45063, making them vulnerable to potential code execution attacks initiated via font operations.

Exploitation Mechanism

By sending specific font operations, such as an OSC 50 response with Ctrl-g, threat actors can exploit this vulnerability to execute arbitrary commands within the vi line-editing mode of Zsh.

Mitigation and Prevention

To safeguard systems from CVE-2022-45063, immediate actions and long-term security practices should be implemented.

Immediate Steps to Take

System administrators are advised to update xterm to version 375 or newer to mitigate the vulnerability. Additionally, restricting font operations and monitoring for suspicious activity can reduce the risk of exploitation.

Long-Term Security Practices

Regular security audits, user awareness training, and maintaining up-to-date software versions are essential for enhancing overall system security posture.

Patching and Updates

Users should follow vendor advisories and security notifications to promptly apply patches and updates that address CVE-2022-45063 and other potential vulnerabilities.