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Buffer overrun in CGI.escape_html

Critical severity GitHub Reviewed Published Dec 14, 2021 to the GitHub Advisory Database • Updated Jan 24, 2024

Package

bundler cgi (RubyGems)

Affected versions

>= 0.3.0, < 0.3.1
>= 0.2.0, < 0.2.1
< 0.1.0.1

Patched versions

0.3.1
0.2.1
0.1.0.1

Description

A buffer overrun vulnerability was discovered in CGI.escape_html. This can lead to a buffer overflow when a user passes a very large string (> 700 MB) to CGI.escape_html on a platform where long type takes 4 bytes, typically, Windows.

References

Reviewed Dec 14, 2021
Published to the GitHub Advisory Database Dec 14, 2021
Published by the National Vulnerability Database Feb 6, 2022
Last updated Jan 24, 2024

Severity

Critical

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
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

1.103%
(84th percentile)

Weaknesses

CVE ID

CVE-2021-41816

GHSA ID

GHSA-5cqm-crxm-6qpv

Source code

Credits

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