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Date: Wed, 09 Jun 2021 23:11:00 +0200
From: Christophe JAILLET <jailletc36@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2021-31618: Apache httpd: NULL pointer dereference on specially crafted HTTP/2 request
CVE-2021-31618: NULL pointer dereference on specially crafted HTTP/2 request
Severity: important
Vendor: The Apache Software Foundation
Versions Affected:
2.4.47
httpd
Description:
Apache HTTP Server 2.4.47
Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected.
This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server.
This affected versions prior to 2.4.47
Mitigation:
none
Credit:
Apache HTTP server would like to thank LI ZHI XIN from NSFocus for reporting this.
References:
https://httpd.apache.org/security/vulnerabilities_24.html
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