Apache HTTP Server is a web server software designed to serve static and dynamic web pages. It is one of the most popular web servers in the world, used by millions of websites to deliver content to users across the globe. The software is open-source, free to use, and runs on various operating systems, including Windows, Linux, and Unix. Apache HTTP Server is renowned for its reliability, speed, and versatility, making it a top choice among web developers and organizations.
One of the recent vulnerabilities detected in Apache HTTP Server is the CVE-2021-40438. This vulnerability affects versions 2.4.48 and earlier and can be exploited by a skilled attacker to send a crafted request uri-path, causing mod_proxy to forward the request to an origin server chosen by the remote user. The attacker can use this vulnerability to compromise sensitive data, steal user credentials, or launch a distributed denial of service (DDoS) attack.
When exploited, this vulnerability can lead to serious consequences. Attackers can use the vulnerability to access confidential information, compromise the integrity of the web server, or cause service disruption to legitimate users. Exploiting the CVE-2021-40438 vulnerability can also allow attackers to gain unauthorized access to the server and further exploit other vulnerabilities on the same system.
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REFERENCES
- https://httpd.apache.org/security/vulnerabilities_24.html
- https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37@%3Cbugs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432@%3Cusers.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c@%3Cusers.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697@%3Cusers.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029@%3Cusers.httpd.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html
- https://lists.fedoraproject.org/archives/list/[email protected]/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/
- https://security.netapp.com/advisory/ntap-20211008-0004/
- https://www.debian.org/security/2021/dsa-4982
To protect against this vulnerability, Apache HTTP Server users and administrators are advised to take the following precautions:
- Apply the latest software patches and security updates to your web server.
- Configure mod_proxy to only allow requests from trusted sources.
- Implement network-based access controls to limit access to your web server.
- Monitor your web server logs for unusual activity, particularly requests containing unexpected or invalid uri-paths.
- Consider using a web application firewall (WAF) to filter out malicious traffic from your web server.
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