Bug 1620342 (CVE-2018-1999043)

Summary:	CVE-2018-1999043 jenkins: Ephemeral user record was created on some invalid authentication attempts
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abenaiss, ahardin, aos-bugs, bleanhar, bmontgom, bparees, ccoleman, dedgar, eparis, java-sig-commits, jburrell, jgoulding, jokerman, mchappel, mizdebsk, mmccomas, msrb, nstielau, obulatov, pbhattac, sponnaga, vbobade, wzheng
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	jenkins 2.138.2	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:36:36 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1620343, 1644136, 1644137, 1644138, 1644139, 1644140, 1644141
Bug Blocks:	1620339, 1642893

Description Sam Fowler 2018-08-23 04:33:09 UTC

Jenkins before LTS version 2.121.3 and weekly version 2.138 have a vulnerability exploitable by unauthenticated users.

When attempting to authenticate using API token, an ephemeral user record was created to validate the token in case an external security realm was used, and the user record in Jenkins not previously saved, as (legacy) API tokens could exist without a persisted user record.

This behavior could be abused to create a large number of ephemeral user records in memory.


External Reference:

https://jenkins.io/security/advisory/2018-08-15/#SECURITY-672

Comment 1 Sam Fowler 2018-08-23 04:33:24 UTC

Created jenkins tracking bugs for this issue:

Affects: fedora-all [bug 1620343]

Comment 3 Jason Shepherd 2018-12-18 22:17:00 UTC

OpenShift Container Platform 3.11 shipped with version 2.121.3 of Jenkins, so it was never affected by this issue.

Comment 5 Sam Fowler 2019-01-14 02:12:19 UTC

*** Bug 1642883 has been marked as a duplicate of this bug. ***

Comment 6 Sam Fowler 2019-04-11 06:44:24 UTC

This vulnerability had an incomplete fix in version 2.121.3. It was correctly fixed in 2.138.2:

https://jenkins.io/security/advisory/2018-10-10/#SECURITY-1162

Comment 7 Sam Fowler 2019-04-11 06:53:08 UTC

Jenkins security policy[0]:

"Any security advisory related updates to Jenkins core or the plugins we include in the OpenShift Jenkins master image will only occur in the v3.11 and v4.x branches of this repository.

We do support running the v3.11 version of the master image against older v3.x (as far back as v3.4) OpenShift clusters if you want to pick up Jenkins security advisory updates."

[0] https://github.com/openshift/jenkins/blob/master/README.md#jenkins-security-advisories-the-master-image-from-this-repository-and-the-oc-binary