Bug 1620342 – CVE-2018-1999043 jenkins: Ephemeral user record was created on some invalid authentication attempts

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Bug 1620342 - (CVE-2018-1999043) CVE-2018-1999043 jenkins: Ephemeral user record was created on some invalid authentication attempts

Summary:	CVE-2018-1999043 jenkins: Ephemeral user record was created on some invalid a...

Status:	NEW

Aliases:	CVE-2018-1999043

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

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

Depends On:	1620343 1644132 1644133 1644134 1644135 1644136 1644137 1644138 1644139 1644140 1644141
Blocks:	1620339
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Reported:	2018-08-23 00:33 EDT by Sam Fowler
Modified:	2018-10-30 01:31 EDT (History)
CC List:	13 users (show)

See Also:
Fixed In Version:	jenkins 2.121.3, jenkins 2.138
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Description Sam Fowler 2018-08-23 00:33:09 EDT

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 00:33:24 EDT

Created jenkins tracking bugs for this issue:

Affects: fedora-all [bug 1620343]

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