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Apache HTTP Server の HTTP/2 プロトコル用プロトコルハンドラにおける NULL ポインタデリファレンスに関する脆弱性
Title Apache HTTP Server の HTTP/2 プロトコル用プロトコルハンドラにおける NULL ポインタデリファレンスに関する脆弱性
Summary

Apache HTTP Server の HTTP/2 プロトコル用 HTTP/2 プロトコルハンドラには、問題のヘッダが最初に受信またはフッタに表示された場合、HTTP/2 プロトコルハンドラで完全に初期化されないため、NULL ポインタデリファレンスに関する脆弱性が存在します。

Possible impacts 初期化されたメモリで NULL ポインタデリファレンスを引き起こされて、子プロセスを確実にクラッシュされる可能性があります。
Solution

ベンダより正式な対策が公開されています。ベンダ情報を参照して適切な対策を実施してください。
Publication Date June 1, 2021, midnight
Registration Date Sept. 7, 2022, 10:54 a.m.
Last Update Sept. 7, 2022, 10:54 a.m.
CVSS3.0 : 重要
Score 7.5
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS2.0 : 警告
Score 5
Vector AV:N/AC:L/Au:N/C:N/I:N/A:P
Affected System
Apache Software Foundation
Apache HTTP Server 2.4.47
オラクル
Instantis EnterpriseTrack 
Oracle Enterprise Manager Ops Center 
ZFS Storage Appliance Kit 
Debian
Debian GNU/Linux 
Fedora Project
Fedora 
CVE (情報セキュリティ 共通脆弱性識別子)
CWE (共通脆弱性タイプ一覧)
ベンダー情報
その他
Change Log
No Changed Details Date of change
1 [2022年09月07日]
  掲載		 Sept. 7, 2022, 10:54 a.m.
NVD Vulnerability Information
CVE-2021-31618
Summary

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.

Publication Date June 15, 2021, 6:15 p.m.
Registration Date June 15, 2021, 8 p.m.
Last Update Nov. 21, 2024, 3:06 p.m.
Affected software configurations
Configuration1 or higher or less more than less than
cpe:2.3:a:apache:http_server:1.15.17:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.47:*:*:*:*:*:*:*
Configuration2 or higher or less more than less than
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Configuration3 or higher or less more than less than
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Configuration4 or higher or less more than less than
cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*
cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
Related information, measures and tools
Common Vulnerabilities List