7.5

CVE-2021-31618

NULL pointer dereference on specially crafted HTTP/2 request

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Apache ≫ HTTP Server Version 1.15.17
Apache ≫ HTTP Server Version 2.4.47
Fedoraproject ≫ Fedora Version 33
Fedoraproject ≫ Fedora Version 34
Debian ≫ Debian Linux Version 9.0
Debian ≫ Debian Linux Version 10.0
Oracle ≫ Enterprise Manager Ops Center Version 12.4.0.0
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 51.49% 0.988
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NIST 5 10 2.9
AV:N/AC:L/Au:N/C:N/I:N/A:P
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

http://httpd.apache.org/security/vulnerabilities_24.html
Vendor Advisory
Release Notes
https://www.oracle.com/security-alerts/cpuoct2021.html
Patch
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00006.html
Third Party Advisory
Mailing List
https://security.gentoo.org/glsa/202107-38
Third Party Advisory
https://www.debian.org/security/2021/dsa-4937
Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/06/10/9
Third Party Advisory
Mailing List
http://www.openwall.com/lists/oss-security/2024/03/13/2
https://lists.apache.org/thread.html/r14b66ef0f4f569fd515a3f96cd4eb58bd9a8ff525cc326bb0359664f%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r783b6558abf3305b17ea462bed4bd66d82866438999bf38cef6d11d1%40%3Ccvs.httpd.apache.org%3E
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2NKJ3ZA3FTSZ2QBBPKS6BYGAWYRABNQQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A73QJ4HPUMU26I6EULG6SCK67TUEXZYR/
https://seclists.org/oss-sec/2021/q2/206
Third Party Advisory
Mailing List
https://security.netapp.com/advisory/ntap-20210727-0008/
Third Party Advisory