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Nokogiri implementation of libxslt lacks integer overflow checks

High severity GitHub Reviewed Published Jul 31, 2018 to the GitHub Advisory Database • Updated Jul 3, 2023

Package

bundler nokogiri (RubyGems)

Affected versions

< 1.7.2

Patched versions

1.7.2

Description

The xsltAddTextString function in transform.c in libxslt 1.1.29, as used in Nokogiri prior to 1.7.2, lacked a check for integer overflow during a size calculation, which allowed a remote attacker to perform an out of bounds memory write via a crafted HTML page.

References

Published by the National Vulnerability Database Apr 24, 2017
Published to the GitHub Advisory Database Jul 31, 2018
Reviewed Jun 16, 2020
Last updated Jul 3, 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
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
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:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS score

2.041%
(89th percentile)

Weaknesses

CVE ID

CVE-2017-5029

GHSA ID

GHSA-pf6m-fxpq-fg8v

Source code

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