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Improper handling of CSS at-rules in lettersanitizer

High severity GitHub Reviewed Published Jun 22, 2022 in mat-sz/lettersanitizer • Updated Jan 27, 2023

Package

npm lettersanitizer (npm)

Affected versions

< 1.0.2

Patched versions

1.0.2

Description

Impact

All versions of lettersanitizer below 1.0.2 are affected by a denial of service issue when processing a CSS at-rule @keyframes.

This package is depended on by react-letter, therefore everyone using react-letter is also at risk.

Patches

The problem has been patched in version 1.0.2.

Workarounds

There is no workaround besides upgrading.

References

The issue was originally reported in the react-letter repository: mat-sz/react-letter#17

For more information

If you have any questions or comments about this advisory:

References

@mat-sz mat-sz published to mat-sz/lettersanitizer Jun 22, 2022
Published to the GitHub Advisory Database Jun 23, 2022
Reviewed Jun 23, 2022
Published by the National Vulnerability Database Jun 27, 2022
Last updated Jan 27, 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

0.121%
(48th percentile)

Weaknesses

CVE ID

CVE-2022-31103

GHSA ID

GHSA-7r3r-gq8p-v9jj

Source code

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