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[R1] Multiple Jenkins Vulnerabilities

Medium
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Synopsis

While researching Jenkins, Tenable found a couple of vulnerabilities.

SECURITY-1128: Unauthenticated Ephemeral User Creation via /securityRealm/user

Closely related to CVE-2017-2613 (aka SECURITY-406) and CVE-2018-1999043 (aka SECURITY-672), any unauthenticated attacker can visit http://<ip>:<port>/securityRealm/user/any-username/ to create an ephemeral user record for a user of any-username. As noted in the previous security advisories, this could be abused to create a large number of ephemeral user records in memory.

This can also interrupt usage of any API endpoint which includes the user's full name, as it is possible to include bad characters in the ephemeral username. For example: navigating to http://<ip>:<port>/securityRealm/user/%02/ will create a user with a full name containing the %02 (STX) control character, which will cause the XML and JSON API endpoints of /asynchPeople/ to become malformed.

SECURITY-1129: Reflected XSS

It's possible to inject XML (and, via the XHTML XML namespace, HTML/javascript) into any API XML endpoint which has the xpath and wrapper parameters. This is possible on a large number of pages that are behind authentication, but also the whoAmI page which is available to unauthenticated users. A proof of concept follows:

http://<ip>:<port>/whoAmI/api/xml?xpath=*&wrapper=?xml version="1.0"?><html xmlns="http://www.w3.org/1999/xhtml"><script>alert('Tenable Nessus')</script></html><!--

Solution

Jenkins weekly should be updated to version 2.146 and Jenkins LTS should be updated to version 2.138.2.

Additional References

https://jenkins.io/security/advisory/2018-10-10/

Disclosure Timeline

08/21/2018 - Vulnerabilities discovered.
08/21/2018 - Vulnerabilities posted to Jenkins issue tracker. SECURITY-1128 and SECURITY-1129 assigned. 90-day date set as 11/19/2018
09/26/2018 - Jenkins asks who to credit.
09/26/2018 - Tenable specifies Evan Grant of Tenable, Inc.
09/26/2018 - Jenkins assigns CVSS scores.
10/08/2018 - Jenkins marks the issues as fixed and flagged for 10/10 release date.
10/10/2018 - Jenkins releases an advisory.

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

Tenable Advisory ID: TRA-2018-29
Credit:
Evan Grant
CVSSv2 Base / Temporal Score:
6.4 / 5.3
CVSSv2 Vector:
AV:N/AC:L/Au:N/C:N/I:P/A:P
Affected Products:
Jenkins LTS up to and including 2.138.1
Jenkins weekly up to and including 2.145
Risk Factor:
Medium
Additional Keywords:
SECURITY-1128
SECURITY-1129

Advisory Timeline

10-10-2018 - [R1] Initial Release
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