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Regular Expression Denial of Service (ReDoS) in Prism

High severity GitHub Reviewed Published Jun 28, 2021 in PrismJS/prism • Updated Feb 1, 2023

Package

npm prismjs (npm)

Affected versions

< 1.24.0

Patched versions

1.24.0

Description

Some languages before 1.24.0 are vulnerable to Regular Expression Denial of Service (ReDoS).

Impact

When Prism is used to highlight untrusted (user-given) text, an attacker can craft a string that will take a very very long time to highlight. Do not use the following languages to highlight untrusted text.

  • ASCIIDoc
  • ERB

Other languages are not affected and can be used to highlight untrusted text.

Patches

This problem has been fixed in Prism v1.24.

References

References

@RunDevelopment RunDevelopment published to PrismJS/prism Jun 28, 2021
Reviewed Jun 28, 2021
Published to the GitHub Advisory Database Jun 28, 2021
Published by the National Vulnerability Database Jun 28, 2021
Last updated Feb 1, 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
Changed
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:R/S:C/C:N/I:N/A:H

EPSS score

0.119%
(48th percentile)

Weaknesses

CVE ID

CVE-2021-32723

GHSA ID

GHSA-gj77-59wh-66hg

Source code

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