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Actively exploited · Published Dec 10, 2018 · Assigned by mitre

CVE-2018-1000861

Critical 9.8 Exploited

In plain English

A critical-severity unsafe deserialization in Jenkins Stapler Web Framework from Jenkins. Attackers are actively exploiting it in the wild (listed by CISA on February 10, 2022). The chance it is exploited in the next 30 days is estimated at 98.3% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)98.3%top 0.1% of all CVEs
Exploited in the wildYesCISA KEV since Feb 10, 2022
Attack tooling3Metasploit, Nuclei, Public PoC

CISA guidance

Apply updates per vendor instructions.

Federal agencies must remediate by Aug 10, 2022.

Official description

A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153 and earlier, LTS 2.138.3 and earlier in stapler/core/src/main/java/org/kohsuke/stapler/MetaClass.java that allows attackers to invoke some methods on Java objects by accessing crafted URLs that were not intended to be invoked this way.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavenorg.jenkins-ci.main:jenkins-core2.138.4GHSA-hhpm-5cp2-hg4x
Mavenorg.jenkins-ci.main:jenkins-core2.154GHSA-hhpm-5cp2-hg4x

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References