NVD Vulnerability Detail

CVE-2020-26290

Summary	Dex is a federated OpenID Connect provider written in Go. In Dex before version 2.27.0 there is a critical set of vulnerabilities which impacts users leveraging the SAML connector. The vulnerabilities enables potential signature bypass due to issues with XML encoding in the underlying Go library. The vulnerabilities have been addressed in version 2.27.0 by using the xml-roundtrip-validator from Mattermost (see related references).
Publication Date	Dec. 29, 2020, 5:15 a.m.
Registration Date	Jan. 26, 2021, 11:56 a.m.
Last Update	Nov. 21, 2024, 2:19 p.m.

CVSS3.1 : CRITICAL
スコア	9.6
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
攻撃元区分(AV)	ネットワーク
攻撃条件の複雑さ(AC)	低
攻撃に必要な特権レベル(PR)	不要
利用者の関与(UI)	要
影響の想定範囲(S)	変更あり
機密性への影響(C)	高
完全性への影響(I)	高
可用性への影響(A)	高

CVSS2.0 : MEDIUM
Score	6.8
Vector	AV:N/AC:M/Au:N/C:P/I:P/A:P
攻撃元区分(AV)	ネットワーク
攻撃条件の複雑さ(AC)	中
攻撃前の認証要否(Au)	不要
機密性への影響(C)	低
完全性への影響(I)	低
可用性への影響(A)	低
Get all privileges.	いいえ
Get user privileges	いいえ
Get other privileges	いいえ
User operation required	はい

Affected software configurations

Configuration1		or higher	or less	more than	less than
cpe:2.3:a:linuxfoundation:dex::::::::					2.27.0

Related information, measures and tools

No	URL	タグ
1	https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8	Patch Third Party Advisory
2	https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8	Patch Third Party Advisory
3	https://github.com/dexidp/dex/releases/tag/v2.27.0	Third Party Advisory
4	https://github.com/dexidp/dex/releases/tag/v2.27.0	Third Party Advisory
5	https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5	Third Party Advisory
6	https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5	Third Party Advisory
7	https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md	Not Applicable Third Party Advisory
8	https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md	Not Applicable Third Party Advisory
9	https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md	Not Applicable Third Party Advisory
10	https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md	Not Applicable Third Party Advisory
11	https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md	Not Applicable Third Party Advisory
12	https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md	Not Applicable Third Party Advisory
13	https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7	Not Applicable Third Party Advisory
14	https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7	Not Applicable Third Party Advisory
15	https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/	Not Applicable Third Party Advisory
16	https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/	Not Applicable Third Party Advisory

Common Vulnerabilities List

JVN Vulnerability Information

Dex におけるデジタル署名の検証に関する脆弱性

Title	Dex におけるデジタル署名の検証に関する脆弱性
Summary	Dex には、デジタル署名の検証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	Dec. 14, 2020, midnight
Registration Date	Sept. 6, 2021, 5:19 p.m.
Last Update	Sept. 6, 2021, 5:19 p.m.

Affected System

Linux Foundation

dex 2.27.0 未満

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-2020-26290	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26290
National Vulnerability Database (NVD)
2	CVE-2020-26290	https://nvd.nist.gov/vuln/detail/CVE-2020-26290

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-347	https://cwe.mitre.org/data/definitions/347.html

ベンダー情報

No	Name	URL
GitHub
1	Merge pull request from GHSA-m9hp-7r99-94h5	https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8

Change Log

No	Changed Details	Date of change
1	[2021年09月06日] 掲載	Sept. 6, 2021, 5:19 p.m.