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Libevent の evbuffer API における整数オーバーフローの脆弱性
Title Libevent の evbuffer API における整数オーバーフローの脆弱性
Summary

Libevent の evbuffer API には、整数オーバーフローの脆弱性が存在します。 本脆弱性は、影響を受けるバージョンが異なるため分割されました。バージョン 2.0 およびそれ以降のみに影響する脆弱性に関しては、CVE-2015-6525 を参照してください。

Possible impacts 攻撃者により、(1) evbuffer_add、(2) evbuffer_expand、または (3) bufferevent_write 関数への "過度に大きな入力 (insanely large input)" を介して、ヒープベースのバッファオーバーフローまたは無限ループを誘発されることで、サービス運用妨害 (DoS) 状態にされるなど、不特定の影響を受け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 Sept. 9, 2014, midnight
Registration Date Aug. 27, 2015, 6:11 p.m.
Last Update Aug. 27, 2015, 6:11 p.m.
CVSS2.0 : 危険
Score 7.5
Vector AV:N/AC:L/Au:N/C:P/I:P/A:P
Affected System
Debian
Debian GNU/Linux 7.0
Niels Provos
libevent 1.4.15 未満の 1.4.x
libevent 2.0.22 未満の 2.0.x
libevent 2.1.5-beta 未満の 2.1.x
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
Change Log
No Changed Details Date of change
0 [2015年08月27日]
  掲載		 Feb. 17, 2018, 10:37 a.m.
NVD Vulnerability Information
CVE-2014-6272
Summary

Multiple integer overflows in the evbuffer API in Libevent 1.4.x before 1.4.15, 2.0.x before 2.0.22, and 2.1.x before 2.1.5-beta allow context-dependent attackers to cause a denial of service or possibly have other unspecified impact via "insanely large inputs" to the (1) evbuffer_add, (2) evbuffer_expand, or (3) bufferevent_write function, which triggers a heap-based buffer overflow or an infinite loop. NOTE: this identifier has been SPLIT per ADT3 due to different affected versions. See CVE-2015-6525 for the functions that are only affected in 2.0 and later.

Publication Date Aug. 24, 2015, 11:59 p.m.
Registration Date Jan. 26, 2021, 3:16 p.m.
Last Update Nov. 21, 2024, 11:14 a.m.
Affected software configurations
Configuration1 or higher or less more than less than
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
Configuration2 or higher or less more than less than
cpe:2.3:a:libevent_project:libevent:2.0.5:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.20:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.6:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.7:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.19:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.8:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.18:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.12:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.12:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.1.4:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.14:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.3:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.6:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.2:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.3:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.10:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.9:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.1.3:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.1:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.9:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.7:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.4:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.5:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.1.2:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.11:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.4:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.15:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.13:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.17:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.8:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.14:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:1.4.10:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.13:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.11:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.2:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.16:*:*:*:*:*:*:*
cpe:2.3:a:libevent_project:libevent:2.0.21:*:*:*:*:*:*:*
Related information, measures and tools
Common Vulnerabilities List