Bug 1620344 – CVE-2018-1999044 jenkins: Cron expression form validation could enter infinite loop, potentially resulting in denial of service

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Bug 1620344 - (CVE-2018-1999044) CVE-2018-1999044 jenkins: Cron expression form validation could enter infinite loop, potentially resulting in denial of service

Summary:	CVE-2018-1999044 jenkins: Cron expression form validation could enter infinit...

Status:	NEW

Aliases:	CVE-2018-1999044

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
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URL:
Whiteboard:	impact=moderate,public=20180815,repor...
Keywords:	Security

Depends On:	1620345
Blocks:	1620339
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Reported:	2018-08-23 00:36 EDT by Sam Fowler
Modified:	2018-10-30 22:05 EDT (History)
CC List:	13 users (show)

See Also:
Fixed In Version:	jenkins 2.121.3, jenkins 2.138
Doc Type:	If docs needed, set a value
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RHEL 7.3 requirements from Atomic Host:
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Description Sam Fowler 2018-08-23 00:36:34 EDT

Jenkins before LTS version 2.121.3 and weekly version 2.138 are vulnerable to a denial of service.

The form validation for cron expressions (e.g. "Poll SCM", "Build periodically") could enter infinite loops when cron expressions only matching certain rare dates were entered, blocking request handling threads indefinitely.


External Reference:

https://jenkins.io/security/advisory/2018-08-15/#SECURITY-790

Comment 1 Sam Fowler 2018-08-23 00:36:52 EDT

Created jenkins tracking bugs for this issue:

Affects: fedora-all [bug 1620345]

Comment 2 Jason Shepherd 2018-10-30 01:18:08 EDT

Upstream commit: https://github.com/jenkinsci/jenkins/commit/e5046911c57e60a1d6d8aca9b21bd9093b0f3763

Comment 3 Jason Shepherd 2018-10-30 22:04:09 EDT

OpenShift Container Platform 3.x uses cgroups to limit the CPU allocated to pods by default. Any denial of service caused by this issue would be limited to the user's own Jenkins instance and won't affect other users on the same compute node.

Comment 4 Jason Shepherd 2018-10-30 22:05:18 EDT

Statement:

Users of OpenShift Container Platform 3.x should upgrade to 3.11 to pick up a fix for this issue.

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