GitHub Advisoryadvisory · Maven

GHSA-fj6f-6933-839j Non-constant time HMAC comparison

MEDIUM Published 2022-05-24 Modified 2022-12-19 Official page ↗
Aliases
CVE-2020-2102
Ecosystem
Maven
Packages
org.jenkins-ci.main:jenkins-core
Severity
Moderate
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-203, CWE-208
Reviewed
2022-12-19

Affected packages

• Maven org.jenkins-ci.main:jenkins-core: < 2.204.2 → fixed in 2.204.2 • Maven org.jenkins-ci.main:jenkins-core: >= 2.205, < 2.219 → fixed in 2.219

Description

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier does not use a constant-time comparison when checking whether two HMACs are equal. This could potentially allow attackers to use statistical methods to obtain a valid HMAC for an attacker-controlled input value. Jenkins 2.219, LTS 2.204.2 now uses a constant-time comparison when validating HMACs.

Related

Alias · CVE (1)

  • CVE-2020-2102 Jenkins 2.218 and earlier, LTS 2.204.1 and earlier used a non-constant time comparison function when validating an HMAC. vulnerability

Weakness · CWE (2)

  • CWE-203 Observable Discrepancy weakness
  • CWE-208 Observable Timing Discrepancy weakness

References