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Excessive CPU usage when URI template matcher is configured using regex

Moderate
phlax published GHSA-x278-4w4x-r7ch Feb 9, 2024

Package

Envoy Proxy (Envoy)

Affected versions

<1.29.1

Patched versions

1.29.1, 1.28.1, 1.27.3, 1.26.7

Description

Summary

The regex expression is compiled for every request and can result in high CPU usage and increased request latency when multiple routes are configured with such matchers.

Impact

Denial of Service due to CPU exhaustion.

Severity

Moderate

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
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

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:U/C:N/I:N/A:L

CVE ID

CVE-2024-23323

Weaknesses

Credits