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phpseclib does not properly limit the ASN1 OID length

High severity GitHub Reviewed Published Mar 2, 2024 to the GitHub Advisory Database • Updated Aug 13, 2024

Package

composer phpseclib/phpseclib (Composer)

Affected versions

>= 3.0.0, < 3.0.36
>= 2.0.0, < 2.0.47
>= 1.0.0, < 1.0.23

Patched versions

3.0.36
2.0.47
1.0.23

Description

An issue was discovered in phpseclib 1.x before 1.0.23, 2.x before 2.0.47, and 3.x before 3.0.36. When processing the ASN.1 object identifier of a certificate, a sub identifier may be provided that leads to a denial of service (CPU consumption for decodeOID).

References

Published by the National Vulnerability Database Mar 1, 2024
Published to the GitHub Advisory Database Mar 2, 2024
Reviewed Mar 4, 2024
Last updated Aug 13, 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
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

0.045%
(17th percentile)

Weaknesses

CVE ID

CVE-2024-27355

GHSA ID

GHSA-jr22-8qgm-4q87

Source code

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