CVE-2021-40438 : Security Advisory and Response
Learn about CVE-2021-40438, a high-severity SSRF vulnerability in Apache HTTP Server 2.4.48 and earlier. Find out the impact, affected systems, exploitation mechanism, and mitigation steps.
A crafted request uri-path can cause mod_proxy to forward the request to an origin server chosen by the remote user. This vulnerability affects Apache HTTP Server 2.4.48 and earlier.
Understanding CVE-2021-40438
This section will delve deeper into the details of the CVE-2021-40438 vulnerability.
What is CVE-2021-40438?
CVE-2021-40438 is a Server Side Request Forgery (SSRF) vulnerability in Apache HTTP Server.
The Impact of CVE-2021-40438
The vulnerability has been classified as high severity.
Technical Details of CVE-2021-40438
Exploring the technical aspects of CVE-2021-40438.
Vulnerability Description
The vulnerability allows a crafted request uri-path to manipulate mod_proxy to forward requests to a server chosen by the attacker.
Affected Systems and Versions
- Product: Apache HTTP Server
- Vendor: Apache Software Foundation
- Versions: Apache HTTP Server 2.4.48 and earlier
Exploitation Mechanism
The vulnerability is exploited by sending a specifically crafted request uri-path to the server.
Mitigation and Prevention
Understanding how to mitigate and prevent the CVE-2021-40438 vulnerability.
Immediate Steps to Take
- Apply the necessary security patches provided by the vendor.
- Monitor network traffic for any suspicious activity.
Long-Term Security Practices
- Implement strong input validation mechanisms.
- Regularly update and patch server software to address known vulnerabilities.
Patching and Updates
Ensure that the Apache HTTP Server is regularly updated with the latest security patches.