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OVAL Definitions
>
OVAL Definition Details
Id
oval:ru.altx-soft.nix:def:166078
[Eng]
Version
3
Class
patch
ALTXid
375327
Language
Russian
Severity
High
Title
ALAS-2021-1672 -- обновление безопасности для httpd
Description
A null pointer de-reference was found in the way httpd handled specially crafted HTTP/2 request. A remote attacker could use this flaw to crash the httpd child process, causing temporary denial of service. (CVE-2021-31618)
Family
unix
Platform
Amazon Linux 2
Product
httpd
Reference
VENDOR: ALAS-2021-1672
VENDOR: ALAS-2021-1672
Id:
ALAS-2021-1672
Reference:
https://alas.aws.amazon.com/AL2/ALAS-2021-1672.html
CVE: CVE-2021-31618
CVE: CVE-2021-31618
Id:
CVE-2021-31618
Reference:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31618
Comment
: 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.
CVSSv2 Score:
5
Access vector:
NETWORK
Access complexity:
LOW
Authentication:
NONE
Confidentiality impact:
NONE
Integrity impact:
NONE
Availability impact:
PARTIAL
CVSSv2 Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSSv3 Score:
7.5
Attack vector:
NETWORK
Attack complexity:
LOW
Privileges required:
NONE
User interaction:
NONE
Scope:
UNCHANGED
Confidentiality impact:
NONE
Integrity impact:
NONE
Availability impact:
HIGH
CVSSv3 Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE:
476 (NULL Pointer Dereference)
References:
http://httpd.apache.org/security/vulnerabilities_24.html (MISC)
https://seclists.org/oss-sec/2021/q2/206 (MISC)
[oss-security] 20210609 CVE-2021-31618: Apache httpd: NULL pointer dereference on specially crafted HTTP/2 request (MLIST)
[debian-lts-announce] 20210709 [SECURITY] [DLA 2706-1] apache2 security update (MLIST)
DSA-4937 (DEBIAN)
GLSA-202107-38 (GENTOO)
https://security.netapp.com/advisory/ntap-20210727-0008/ (CONFIRM)
https://www.oracle.com/security-alerts/cpuoct2021.html (MISC)
[httpd-cvs] 20210615 svn commit: r1890801 - /httpd/site/trunk/content/security/json/CVE-2021-31618.json ()
[httpd-cvs] 20210615 svn commit: r1075782 - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_24.html ()
FEDORA-2021-051639aad4 ()
FEDORA-2021-181f29c392 ()
[oss-security] 20240313 Re: CVE-2021-31618: Apache httpd: NULL pointer dereference on specially crafted HTTP/2 request ()
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