Medium severity · published Dec 30, 2020
CVE-2020-26247
Nokogiri is a Rubygem providing HTML, XML, SAX, and Reader parsers with XPath and CSS selector support
4.3
CVSS
1.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 68% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
9.0; 10.0 · source: NVD
NO
Nokogiri · Nokogiri
before 1.11.0; 1.11.0; 1.11.0; 1.11.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-26247
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-26247
Patch
https://github.com/sparklemotion/nokogiri/commit/9c87439d9afa14a365ff13e73adc809cb2c3d97b
Release Notes
https://github.com/sparklemotion/nokogiri/releases/tag/v1.11.0.rc4
Mitigation
https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-vr8q-g5c7-m54m
Permissions Required
https://hackerone.com/reports/747489
Mailing List
https://lists.debian.org/debian-lts-announce/2021/06/msg00007.html
Mailing List
https://lists.debian.org/debian-lts-announce/2022/10/msg00018.html
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