NVD Vulnerability Detail

CVE-2017-2624

Summary	It was found that xorg-x11-server before 1.19.0 including uses memcmp() to check the received MIT cookie against a series of valid cookies. If the cookie is correct, it is allowed to attach to the Xorg session. Since most memcmp() implementations return after an invalid byte is seen, this causes a time difference between a valid and invalid byte, which could allow an efficient brute force attack.
Publication Date	July 28, 2018, 3:29 a.m.
Registration Date	Jan. 26, 2021, 1:22 p.m.
Last Update	Nov. 21, 2024, 12:23 p.m.

Affected software configurations

Configuration1		or higher	or less	more than	less than
cpe:2.3:a:x.org:xorg-server::::::::			1.19.4

Configuration2		or higher	or less	more than	less than
cpe:2.3:o:debian:debian_linux:7.0:::::::*

Related information, measures and tools

No	URL	タグ
1	http://www.securityfocus.com/bid/96480	Third Party Advisory VDB Entry
2	http://www.securityfocus.com/bid/96480	Third Party Advisory VDB Entry
3	http://www.securitytracker.com/id/1037919	Third Party Advisory VDB Entry
4	http://www.securitytracker.com/id/1037919	Third Party Advisory VDB Entry
5	https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624	Exploit Issue Tracking Third Party Advisory
6	https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624	Exploit Issue Tracking Third Party Advisory
7	https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c	Patch Third Party Advisory
8	https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c	Patch Third Party Advisory
9	https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html	Third Party Advisory
10	https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html	Third Party Advisory
11	https://security.gentoo.org/glsa/201704-03	Third Party Advisory
12	https://security.gentoo.org/glsa/201704-03	Third Party Advisory
13	https://security.gentoo.org/glsa/201710-30	Third Party Advisory
14	https://security.gentoo.org/glsa/201710-30	Third Party Advisory
15	https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/	Exploit Third Party Advisory
16	https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/	Exploit Third Party Advisory

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-200	情報漏えい	https://cwe.mitre.org/data/definitions/200.html

JVN Vulnerability Information

xorg-x11-server における情報漏えいに関する脆弱性

Title	xorg-x11-server における情報漏えいに関する脆弱性
Summary	xorg-x11-server には、情報漏えいに関する脆弱性が存在します。
Possible impacts	情報を取得される、情報を改ざんされる、およびサービス運用妨害 (DoS) 状態に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	Feb. 28, 2017, midnight
Registration Date	Oct. 29, 2018, 12:10 p.m.
Last Update	Oct. 29, 2018, 12:10 p.m.

Affected System

X.Org Foundation

X.Org Server 1.19.0 未満

Debian

Debian GNU/Linux

CVE (情報セキュリティ共通脆弱性識別子)

No	Name	URL
Common Vulnerabilities and Exposures (CVE)
1	CVE-2017-2624	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2624
National Vulnerability Database (NVD)
2	CVE-2017-2624	https://nvd.nist.gov/vuln/detail/CVE-2017-2624

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-200	https://jvndb.jvn.jp/ja/cwe/CWE-200.html

ベンダー情報

No	Name	URL
Debian
1	[SECURITY] [DLA 1186-1] xorg-server security update	https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html
freedesktop.org
2	Use timingsafe_memcmp() to compare MIT-MAGIC-COOKIES CVE-2017-2624	https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c

Change Log

No	Changed Details	Date of change
1	[2018年10月29日] 掲載	Oct. 29, 2018, 12:10 p.m.