[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <1622544226.KAPKHQKN@httpd.apache.org>
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
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
