NVD Vulnerability Detail

CVE-2020-26247

Summary	Nokogiri is a Rubygem providing HTML, XML, SAX, and Reader parsers with XPath and CSS selector support. In Nokogiri before version 1.11.0.rc4 there is an XXE vulnerability. XML Schemas parsed by Nokogiri::XML::Schema are trusted by default, allowing external resources to be accessed over the network, potentially enabling XXE or SSRF attacks. This behavior is counter to the security policy followed by Nokogiri maintainers, which is to treat all input as untrusted by default whenever possible. This is fixed in Nokogiri version 1.11.0.rc4.
Publication Date	Dec. 31, 2020, 4:15 a.m.
Registration Date	Jan. 26, 2021, 10:40 a.m.
Last Update	Nov. 21, 2024, 2:19 p.m.

Affected software configurations

Configuration1	or higher	or less	more than	less than
cpe:2.3:a:nokogiri:nokogiri::::::ruby::*				1.11.0
cpe:2.3:a:nokogiri:nokogiri:1.11.0:rc1::::ruby::*
cpe:2.3:a:nokogiri:nokogiri:1.11.0:rc2::::ruby::*
cpe:2.3:a:nokogiri:nokogiri:1.11.0:rc3::::ruby::*

Related information, measures and tools

No	URL	タグ
1	https://github.com/sparklemotion/nokogiri/commit/9c87439d9afa14a365ff13e73adc809cb2c3d97b	Patch Third Party Advisory
2	https://github.com/sparklemotion/nokogiri/commit/9c87439d9afa14a365ff13e73adc809cb2c3d97b	Patch Third Party Advisory
3	https://github.com/sparklemotion/nokogiri/releases/tag/v1.11.0.rc4	Release Notes Third Party Advisory
4	https://github.com/sparklemotion/nokogiri/releases/tag/v1.11.0.rc4	Release Notes Third Party Advisory
5	https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-vr8q-g5c7-m54m	Mitigation Third Party Advisory
6	https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-vr8q-g5c7-m54m	Mitigation Third Party Advisory
7	https://hackerone.com/reports/747489	Permissions Required
8	https://hackerone.com/reports/747489	Permissions Required
9	https://lists.debian.org/debian-lts-announce/2021/06/msg00007.html	Mailing List Third Party Advisory
10	https://lists.debian.org/debian-lts-announce/2021/06/msg00007.html	Mailing List Third Party Advisory
11	https://lists.debian.org/debian-lts-announce/2022/10/msg00018.html	Mailing List Third Party Advisory
12	https://lists.debian.org/debian-lts-announce/2022/10/msg00018.html	Mailing List Third Party Advisory
13	https://rubygems.org/gems/nokogiri	Product Third Party Advisory
14	https://rubygems.org/gems/nokogiri	Product Third Party Advisory
15	https://security.gentoo.org/glsa/202208-29	Third Party Advisory
16	https://security.gentoo.org/glsa/202208-29	Third Party Advisory

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-611	XML 外部エンティティ参照の不適切な制限	https://cwe.mitre.org/data/definitions/611.html

JVN Vulnerability Information

Nokogiri における XML 外部エンティティの脆弱性

Title	Nokogiri における XML 外部エンティティの脆弱性
Summary	Nokogiri には、XML 外部エンティティの脆弱性が存在します。
Possible impacts	情報を取得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. 30, 2020, midnight
Registration Date	Sept. 8, 2021, 9:48 a.m.
Last Update	Sept. 8, 2021, 9:48 a.m.

Affected System

Nokogiri project

Nokogiri 1.11.0.rc4 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-2020-26247	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26247
National Vulnerability Database (NVD)
2	CVE-2020-26247	https://nvd.nist.gov/vuln/detail/CVE-2020-26247

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-611	https://cwe.mitre.org/data/definitions/611.html

ベンダー情報

No	Name	URL
GitHub
1	feat: XML::Schema and RelaxNG creation accept optional ParseOptions	https://github.com/sparklemotion/nokogiri/commit/9c87439d9afa14a365ff13e73adc809cb2c3d97b
2	Nokogiri::XML::Schema trusts input by default, exposing risk of an XXE vulnerability	https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-vr8q-g5c7-m54m
3	v1.11.0.rc4 / 2020-12-29	https://github.com/sparklemotion/nokogiri/releases/tag/v1.11.0.rc4
RubyGems
4	nokogiri 1.12.3	https://rubygems.org/gems/nokogiri

Change Log

No	Changed Details	Date of change
1	[2021年09月08日] 掲載	Sept. 8, 2021, 9:48 a.m.