Apache addressed a couple of severe vulnerabilities in Apache HTTP Server

The Apache Software Foundation released Apache HTTP Server 2.4.52 to address a couple of security flaws that can lead to remote code execution.

The Apache Software Foundation has released the Apache HTTP Server 2.4.52 to address a couple of vulnerabilities, tracked as CVE-2021-44790 and CVE-2021-44224, that can lead to remote code execution attacks.

The CVE-2021-44790 is a possible buffer overflow when parsing multipart content in mod_lua of Apache HTTP Server 2.4.51 and earlier. The Apache httpd team is not aware of attacks in the wild exploiting this vulnerability.

“A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser (r:parsebody() called from Lua scripts).” reads the advisory published by the foundation.

The second flaw, tracked as CVE-2021-44224, is a possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier.

“A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery).” continues the advisory.

The Apache httpd team is not aware of an exploit for the vulnerability though it might be possible to craft one.

US CISA recommends users and administrators review the Apache announcement and update their installs as soon as possible.

“The Apache Software Foundation has released Apache HTTP Server 2.4.52. This version addresses vulnerabilities—CVE-2021-44790 and CVE-2021-44224—one of which may allow a remote attacker to take control of an affected system.” reads the advisory published by CISA.

In November, Germany’s Federal Office for Information Security (BSI) and Cisco warned threat actors are exploiting another server-side request forgery (SSRF) vulnerability, tracked as CVE-2021-40438, in HTTP servers.

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Pierluigi Paganini

(SecurityAffairs – hacking, Apache)

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Pierluigi Paganini

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer. Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US. Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.