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                             CERT-Renater

                 Note d'Information No. 2018/VULN032
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DATE                : 25/01/2018

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Ant for Jenkins,
                       Checkstyle for Jenkins, DRY for Jenkins,
                       FindBugs for Jenkins,  for Jenkins,
                       Pipeline: Nodes and Processes for Jenkins,
                       PMD for Jenkins, Release for Jenkins,
                       Translation Assistance for Jenkins,
                       Warnings for Jenkins.

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https://jenkins.io/security/advisory/2018-01-22/
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Jenkins Security Advisory 2018-01-22

This advisory announces vulnerabilities in these Jenkins plugins:

    Ant

    Checkstyle

    DRY

    FindBugs

    Pipeline: Nodes and Processes

    PMD

    Release

    Translation Assistance

    Warnings


Description

XXE vulnerabilities in multiple static analysis plugins

    SECURITY-655 / CVE-2018-1000008 (PMD)

    SECURITY-656 / CVE-2018-1000009 (Checkstyle)

    SECURITY-657 / CVE-2018-1000010 (DRY)

    SECURITY-658 / CVE-2018-1000011 (FindBugs)

    SECURITY-695 / CVE-2018-1000012 (Warnings)

Multiple plugins based on Static Analysis Utilities plugin are affected
by an XML External Entity (XXE) processing vulnerability. This allows
attacker to configure build processes such that one of these plugins
parses a maliciously crafted file that uses external entities for
extraction of secrets from the Jenkins master, server-side request
forgery, or denial-of-service attacks.

External entity resolution has been disabled for these plugins.


CSRF vulnerability in Release plugin

SECURITY-607 / CVE-2018-1000013

Release plugin did not require form submissions to be submitted via
POST, resulting in a CSRF vulnerability allowing attackers to trigger
release builds.

Access to the form action URL now requires POST.


CSRF vulnerability in Translation Assistance plugin

SECURITY-507 / CVE-2018-1000014

Translation Assistance plugin did not require form submissions to be
submitted via POST, resulting in a CSRF vulnerability allowing
attackers to override localized strings displayed to all users on the
current Jenkins instance if the victim is a Jenkins administrator.

Access to the form action URL now requires POST.


Incorrect permission checks in Pipeline: Nodes and Processes plugin
allows executing builds on agents while lacking Computer/Build
permission

SECURITY-675 / CVE-2018-1000015

On instances with Authorize Project plugin, the authentication
associated with a build may lack the Computer/Build permission on some
agents. This did not prevent the execution of node blocks on those
agents due to incorrect permissions checks in Pipeline: Nodes and
Processes plugin.

Build permissions on agents are now properly enforced for node steps.


XSS vulnerability in job configuration forms in Ant plugin

SECURITY-624 and SECURITY-694

Ant plugin failed to escape tool names it shows on job configuration
screens, resulting in a cross-site scripting (XSS) vulnerability that
is exploitable only by Jenkins administrators.

This is the same vulnerability that was announced without a fix on
2017-12-05. Contrary to what we wrote in that security advisory, Ant
Plugin shows both the JDK and Ant tools on the configuration screen,
and the vulnerability in Ant plugin was responsible for both problems
we confirmed in the previous advisory.

Ant plugin now correctly escapes tool names shown on the job
configuration screen.


Severity

    SECURITY-507: low

    SECURITY-607: medium

    SECURITY-655: high

    SECURITY-656: high

    SECURITY-657: high

    SECURITY-658: high

    SECURITY-675: medium

    SECURITY-694: medium

    SECURITY-695: high


Affected versions

    Ant plugin up to and including 1.7

    Checkstyle plugin up to and including 3.49

    DRY plugin up to and including 2.49

    FindBugs plugin up to and including 4.71

    Pipeline: Nodes and Processes plugin up to and including 2.17

    PMD plugin up to and including 3.49

    Release plugin up to and including 2.9

    Translation Assistance plugin up to and including 1.15

    Warnings plugin up to and including 4.64


Fix

    Ant plugin should be updated to version 1.8

    Checkstyle plugin should be updated to version 3.50

    DRY plugin should be updated to version 2.50

    FindBugs plugin should be updated to version 4.72

    Pipeline: Nodes and Processes plugin should be updated to version
              2.18

    PMD plugin should be updated to version 3.50

    Release plugin should be updated to version 2.10

    Translation Assistance plugin should be updated to version 1.16

    Warnings plugin should be updated to version 4.65

These versions include fixes to the vulnerabilities described above.
All prior versions are considered to be affected by these
vulnerabilities unless otherwise indicated.


Credit

The Jenkins project would like to thank the reporters for discovering
and reporting these vulnerabilities:

    Adith Sudhakar for SECURITY-655, SECURITY-656, SECURITY-657,
                              SECURITY-658

    Jesse Glick, CloudBees, Inc. for SECURITY-607, SECURITY-675

    Oleg Nenashev, CloudBees, Inc. for SECURITY-507



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+ 23 - 25 Rue Daviel    | fax : 01-53-94-20-41           +
+ 75013 Paris           | email: cert@support.renater.fr +
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