CVE-2021-31618

Name
CVE-2021-31618
Description
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 issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.
NVD Severity
medium
Other trackers
Mailing lists
Exploits
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
MISC http://httpd.apache.org/security/vulnerabilities_24.html
MISC https://seclists.org/oss-sec/2021/q2/206
MLIST https://lists.apache.org/thread.html/r783b6558abf3305b17ea462bed4bd66d82866438999bf38cef6d11d1@%3Ccvs.httpd.apache.org%3E
MLIST https://lists.apache.org/thread.html/r14b66ef0f4f569fd515a3f96cd4eb58bd9a8ff525cc326bb0359664f@%3Ccvs.httpd.apache.org%3E
MLIST http://www.openwall.com/lists/oss-security/2021/06/10/9
FEDORA https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A73QJ4HPUMU26I6EULG6SCK67TUEXZYR/
FEDORA https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2NKJ3ZA3FTSZ2QBBPKS6BYGAWYRABNQQ/
Mailing List https://lists.debian.org/debian-lts-announce/2021/07/msg00006.html
Third Party Advisory https://www.debian.org/security/2021/dsa-4937
Third Party Advisory https://security.gentoo.org/glsa/202107-38
Third Party Advisory https://security.netapp.com/advisory/ntap-20210727-0008/
MISC https://www.oracle.com/security-alerts/cpuoct2021.html

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:apache:http_server:1.15.17:*:*:*:*:*:*:* http_server == None == 1.15.17
cpe:2.3:a:apache:http_server:2.4.47:*:*:*:*:*:*:* http_server == None == 2.4.47

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
apache2 3.10-main 2.4.48-r0 Kaarle Ritvanen <kaarle.ritvanen@datakunkku.fi> fixed