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AUSCERT External Security Bulletin Redistribution
ESB-2017.2856
Jenkins Security Advisory 2017-11-08
9 November 2017
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AusCERT Security Bulletin Summary
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Product: Jenkins
Publisher: Jenkins
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Cross-site Scripting -- Existing Account
Access Confidential Data -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
Original Bulletin:
https://jenkins.io/security/advisory/2017-11-08/
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This advisory announces multiple vulnerabilities in Jenkins.
Description
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
records.
- -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.
Severity
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
Fix
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.
Credit
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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