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Security Advisories: GSA_kwCzR0hTQS1majZmLTY5MzMtODM5as4AAjcN

Non-constant time HMAC comparison

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.

Permalink: https://github.com/advisories/GHSA-fj6f-6933-839j
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1majZmLTY5MzMtODM5as4AAjcN
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: about 2 years ago
Updated: 7 months ago


CVSS Score: 5.3
CVSS vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Identifiers: GHSA-fj6f-6933-839j, CVE-2020-2102
References: Repository: https://github.com/jenkinsci/jenkins
Blast Radius: 1.0

Affected Packages

maven:org.jenkins-ci.main:jenkins-core
Affected Version Ranges: >= 2.205, <= 2.218, <= 2.204.1
Fixed in: 2.219, 2.204.2