What is the severity of CVE-2020-2102?

CVE-2020-2102 has a medium severity rating due to potential HMAC computation vulnerabilities.

How do I fix CVE-2020-2102?

To resolve CVE-2020-2102, upgrade Jenkins to version 2.219 or LTS version 2.204.2 or later.

What versions of Jenkins are affected by CVE-2020-2102?

CVE-2020-2102 affects Jenkins versions 2.218 and earlier, as well as LTS versions 2.204.1 and earlier.

What could happen if CVE-2020-2102 is exploited?

Exploitation of CVE-2020-2102 could allow attackers to construct valid HMACs for controlled input, leading to unauthorized access.

Is there a way to mitigate CVE-2020-2102 without upgrading?

There are no effective mitigations for CVE-2020-2102 other than upgrading to a secure version.

Vulnerability/
CVE-2020-2102

medium

5.3

CWE

203 208

29/1/2020

24/5/2022

4/8/2024

CVE-2020-2102

First published: Wed Jan 29 2020(Updated: )

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.

Credit: jenkinsci-cert@googlegroups.com jenkinsci-cert@googlegroups.com jenkinsci-cert@googlegroups.com

Affected Software	Affected Version	How to fix
maven/org.jenkins-ci.main:jenkins-core	>=2.205<=2.218	2.219
maven/org.jenkins-ci.main:jenkins-core	<=2.204.1	2.204.2
Jenkins Jenkins	<=2.204.1
Jenkins Jenkins	<=2.218

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Reference Links

Frequently Asked Questions

What is the severity of CVE-2020-2102?
CVE-2020-2102 has a medium severity rating due to potential HMAC computation vulnerabilities.
How do I fix CVE-2020-2102?
To resolve CVE-2020-2102, upgrade Jenkins to version 2.219 or LTS version 2.204.2 or later.
What versions of Jenkins are affected by CVE-2020-2102?
CVE-2020-2102 affects Jenkins versions 2.218 and earlier, as well as LTS versions 2.204.1 and earlier.
What could happen if CVE-2020-2102 is exploited?
Exploitation of CVE-2020-2102 could allow attackers to construct valid HMACs for controlled input, leading to unauthorized access.
Is there a way to mitigate CVE-2020-2102 without upgrading?
There are no effective mitigations for CVE-2020-2102 other than upgrading to a secure version.

collector/nvd-index
collector/nvd-api
collector/github-advisory-latest
alias/GHSA-fj6f-6933-839j
alias/CVE-2020-2102
collector/nvd-cve
collector/github-advisory
agent/weakness
agent/type
agent/softwarecombine
collector/mitre-cve
source/MITRE
agent/last-modified-date
agent/author
agent/references
agent/severity
agent/description
agent/first-publish-date
agent/event
agent/trending
agent/tags
agent/source
vendor/jenkins
canonical/jenkins jenkins
version/jenkins jenkins/2.204.1
version/jenkins jenkins/2.218
package-manager/maven

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Frequently Asked Questions

What is the severity of CVE-2020-2102?
CVE-2020-2102 has a medium severity rating due to potential HMAC computation vulnerabilities.
How do I fix CVE-2020-2102?
To resolve CVE-2020-2102, upgrade Jenkins to version 2.219 or LTS version 2.204.2 or later.
What versions of Jenkins are affected by CVE-2020-2102?
CVE-2020-2102 affects Jenkins versions 2.218 and earlier, as well as LTS versions 2.204.1 and earlier.
What could happen if CVE-2020-2102 is exploited?
Exploitation of CVE-2020-2102 could allow attackers to construct valid HMACs for controlled input, leading to unauthorized access.
Is there a way to mitigate CVE-2020-2102 without upgrading?
There are no effective mitigations for CVE-2020-2102 other than upgrading to a secure version.