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CollabNet Subversion Edge Management Tail LFI

CollabNet Subversion Edge Management Tail LFI
Posted Jun 30, 2015
Authored by otr

The CollabNet Subversion Edge Management Frontend allows authenticated admins to read arbitrary local files via logfile "filename" parameter of the tail action. Fixed in version 5.0. Version 4.0.11 is affected.

tags | exploit, arbitrary, local, file inclusion
MD5 | de79560bb10501b5f5f80a0fc253ef0d

CollabNet Subversion Edge Management Tail LFI

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# 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.

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