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HTTP response splitting in CGI

High severity GitHub Reviewed Published Nov 19, 2022 to the GitHub Advisory Database • Updated Jan 24, 2024

Package

bundler cgi (RubyGems)

Affected versions

>= 0.3.0, < 0.3.5
>= 0.2.0, < 0.2.2
< 0.1.0.2

Patched versions

0.3.5
0.2.2
0.1.0.2

Description

Ruby gem cgi.rb prior to versions 0.3.5, 0.2.2 and 0.1.0.2 allow HTTP header injection. If a CGI application using the CGI library inserts untrusted input into the HTTP response header, an attacker can exploit it to insert a newline character to split a header, and inject malicious content to deceive clients. This issue has been patched in versions 0.3.5, 0.2.2 and 0.1.0.2.

References

Published by the National Vulnerability Database Nov 18, 2022
Published to the GitHub Advisory Database Nov 19, 2022
Reviewed Nov 24, 2022
Last updated Jan 24, 2024

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
Low
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:L/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.521%
(78th percentile)

Weaknesses

CVE ID

CVE-2021-33621

GHSA ID

GHSA-vc47-6rqg-c7f5

Source code

No known source code

Credits

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