CVE-2021-36160 : What You Need to Know

A carefully crafted request uri-path can cause mod_proxy_uwsgi to read above the allocated memory and crash, leading to denial of service (DoS) attacks. This vulnerability affects Apache HTTP Server versions 2.4.30 to 2.4.48.

Understanding CVE-2021-36160

This section provides insights into the nature and impact of the CVE-2021-36160 vulnerability.

What is CVE-2021-36160?

CVE-2021-36160 highlights a vulnerability in Apache HTTP Server that allows attackers to trigger a denial of service by exploiting the mod_proxy_uwsgi module. By sending a specifically crafted request uri-path, the attacker forces mod_proxy_uwsgi to read beyond allocated memory, causing the server to crash.

The Impact of CVE-2021-36160

The impact of this vulnerability is considered moderate. An attacker can exploit it to crash the Apache HTTP Server, leading to service disruption and potential downtime.

Technical Details of CVE-2021-36160

This section delves into the technical aspects of the CVE-2021-36160 vulnerability.

Vulnerability Description

The vulnerability arises due to an out-of-bounds read within the mod_proxy_uwsgi module. This allows an attacker to craft malicious requests that result in reading memory beyond the intended buffer, causing the server to crash.

Affected Systems and Versions

Apache HTTP Server versions 2.4.30 to 2.4.48 are affected by this vulnerability. Users operating these versions are at risk of exploitation and should take immediate action to mitigate the threat.

Exploitation Mechanism

To exploit CVE-2021-36160, an attacker sends a well-crafted request uri-path to the targeted Apache HTTP Server running the affected versions. By causing mod_proxy_uwsgi to read beyond allocated memory, the attacker can trigger a denial of service condition.

Mitigation and Prevention

Protecting your systems from CVE-2021-36160 is crucial to maintain security and availability.

Immediate Steps to Take

Update Apache HTTP Server to a non-vulnerable version.
Apply patches provided by the Apache Software Foundation to address the vulnerability.

Long-Term Security Practices

Regularly monitor security advisories and update Apache HTTP Server promptly.
Implement network security measures to detect and mitigate DoS attacks effectively.

Patching and Updates

Stay informed about security updates released by the Apache Software Foundation, and ensure timely deployment to fix known vulnerabilities.