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Regular expression denial of service in Apache ShenYu

High severity GitHub Reviewed Published May 18, 2022 to the GitHub Advisory Database • Updated Jul 11, 2023

Package

maven org.apache.shenyu:shenyu (Maven)

Affected versions

>= 2.4.0, < 2.4.3

Patched versions

2.4.3
maven org.apache.shenyu:shenyu-bootstrap (Maven)
>= 2.4.0, < 2.4.3
2.4.3

Description

In Apache ShenYui, ShenYu-Bootstrap, RegexPredicateJudge.java uses Pattern.matches(conditionData.getParamValue(), realData) to make judgments, where both parameters are controllable by the user. This can cause an attacker pass in malicious regular expressions and characters causing a resource exhaustion. This issue affects Apache ShenYu (incubating) 2.4.0, 2.4.1 and 2.4.2 and is fixed in 2.4.3.

References

Published by the National Vulnerability Database May 17, 2022
Published to the GitHub Advisory Database May 18, 2022
Reviewed May 25, 2022
Last updated Jul 11, 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

0.122%
(48th percentile)

Weaknesses

CVE ID

CVE-2022-26650

GHSA ID

GHSA-cw56-j3fm-7w57

Source code

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