oss-security - CVE-2021-41524: Apache HTTP Server: null pointer dereference in h2 fuzzing

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Date: Tue, 05 Oct 2021 09:02:50 +0000
From: Stefan Eissing <icing@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2021-41524: Apache HTTP Server: null pointer dereference in h2
 fuzzing 

Severity: moderate

Description:

While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request processing,
allowing an external source to DoS the server. This requires a specially crafted request. 

The vulnerability was recently introduced in version 2.4.49. No exploit is known to the project.

Mitigation:

Disable the HTTP/2 protocol.

Credit:

Apache httpd team would like to thank LI ZHI XIN from NSFocus Security Team for reporting this issue.

References:

https://httpd.apache.org/security/vulnerabilities_24.html

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