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             AUSCERT External Security Bulletin Redistribution

                   Jenkins Security Advisory 2017-11-08
                              9 November 2017


        AusCERT Security Bulletin Summary

Product:           Jenkins
Publisher:         Jenkins
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Cross-site Scripting     -- Existing Account
                   Access Confidential Data -- Existing Account
                   Reduced Security         -- Existing Account
Resolution:        Patch/Upgrade

Original Bulletin: 

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This advisory announces multiple vulnerabilities in Jenkins.

Unsafe use of user names as directory names

SECURITY-499 / CVE pending

Jenkins stores metadata related to people, which encompasses actual user 
accounts, as well as users appearing in SCM, in directories corresponding to 
the user ID on disk. These directories used the user ID for their name without
additional escaping. This potentially resulted in a number of problems, such 
as the following:

- -User names consisting of a single forward slash would have their user 
record stored in the parent directory; deleting this user deleted all user 

- -User names containing character sequences such as .. could be used to 
clobber other configuration files in Jenkins.

- -User names could consist of reserved names such as COM (on Windows).

This is not limited to the Jenkins user database security realm, other 
security realms such as LDAP may allow users to create user names that result
in problems in Jenkins.

User names are now transformed into a filesystem-safe representation that is 
used as directory name.

Persisted XSS vulnerability in autocompletion suggestions

SECURITY-641 / CVE pending

Autocompletion suggestions for text fields were not escaped, resulting in a 
persisted cross-site scripting vulnerability if the source for the suggestions
allowed specifying text that includes HTML metacharacters like less-than and 
greater-than characters.

Known previously unsafe sources for these suggestions include the names of 
loggers in the log recorder condition, and agent labels.

Autocompletion suggestions are now escaped and can no longer contain 
HTML-based formatting.


SECURITY-499: Various, the highest of which is low
SECURITY-641: low

Affected versions

Jenkins weekly up to and including 2.88
Jenkins LTS up to and including 2.73.2


Jenkins weekly should be updated to 2.89
Jenkins LTS should be updated to 2.73.3

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


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

Darren Zhao for SECURITY-499
Viktor Gazdag of NCC Group for SECURITY-641

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