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libxml as used in Nokogiri has an infinite loop in a certain end-of-file situation

High severity GitHub Reviewed Published Feb 24, 2020 to the GitHub Advisory Database • Updated Jun 9, 2023

Package

bundler nokogiri (RubyGems)

Affected versions

< 1.10.8

Patched versions

1.10.8

Description

xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an infinite loop in a certain end-of-file situation.
The Nokogiri RubyGem has patched its vendored copy of libxml2 in order to prevent this issue from affecting nokogiri.

References

Published by the National Vulnerability Database Jan 21, 2020
Reviewed Feb 18, 2020
Published to the GitHub Advisory Database Feb 24, 2020
Last updated Jun 9, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.593%
(79th percentile)

Weaknesses

CVE ID

CVE-2020-7595

GHSA ID

GHSA-7553-jr98-vx47

Source code

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