CVE-2022-41743 : Security Advisory and Response

This article provides an overview of CVE-2022-41743, a vulnerability in NGINX Plus versions R27 and R26 that could allow a local attacker to corrupt NGINX worker memory, potentially leading to a crash or other impacts.

Understanding CVE-2022-41743

CVE-2022-41743 is a vulnerability found in NGINX Plus versions R27 and R26 related to the ngx_http_hls_module, allowing a local attacker to disrupt NGINX worker memory with specially crafted audio or video files when the hls directive is utilized.

What is CVE-2022-41743?

NGINX Plus versions R27 P1 and R26 P1 are susceptible to a vulnerability in the ngx_http_hls_module that enables local attackers to corrupt NGINX worker memory. This could result in a crash or other impacts when processing malicious audio or video files.

The Impact of CVE-2022-41743

The vulnerability poses a high severity risk with a CVSS base score of 7.0. Attackers can potentially disrupt the availability, integrity, and confidentiality of affected systems through memory corruption, requiring immediate attention.

Technical Details of CVE-2022-41743

The technical aspects of CVE-2022-41743 include a detailed vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises in NGINX Plus due to improper handling of specially crafted audio or video files within the ngx_http_hls_module, leading to memory corruption and possible system crashes.

Affected Systems and Versions

NGINX Plus versions R27 (prior to R27 P1) and R26 (prior to R26 P1) with the use of the hls directive in the configuration file are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by tricking the system into processing malicious audio or video files using the ngx_http_hls_module, corrupting NGINX worker memory and causing system instability.

Mitigation and Prevention

To mitigate the risks associated with CVE-2022-41743, immediate actions and long-term security practices are recommended alongside timely patching and updates.

Immediate Steps to Take

Immediately update NGINX Plus to versions R27 P1 or R26 P1 to address the vulnerability and prevent potential memory corruption and system crashes.

Long-Term Security Practices

Implement strict file validation mechanisms, limit access to sensitive systems, and conduct regular security assessments to prevent similar vulnerabilities in the future.

Patching and Updates

Regularly monitor security advisories from NGINX Plus, apply patches promptly, and ensure systems are up to date to protect against known vulnerabilities.