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CollabNet Subversion Edge Management Brute Forcing

CollabNet Subversion Edge Management Brute Forcing
Posted Jun 30, 2015
Authored by otr

The CollabNet Subversion Edge Management Frontend does not protect against brute forcing accounts. An attacker has infinite tries to guess a valid user password. Fixed in version 5.0. Version 4.0.11 is affected.

tags | advisory, cracker
SHA-256 | c4a5be8f15df488c6909bf4b2ac7dc41e0d49ed272885ca67e0b4f9bf8d4b650

CollabNet Subversion Edge Management Brute Forcing

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# Vuln Title: The CollabNet Subversion Edge does not protect against brute
# forcing accounts
#
# 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: Lack of defensive measures
#
# Risk: Medium
# Status: public/fixed
# Fixed versions: 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 does not protect against brute
forcing accounts. An attacker has infinite tries to guess a valid user password.

Fix proposal:

Implement user specific time penalities or lock outs after a certain amount of
failed logins and provide configuration options for that feature.

Vendor fix:

Invalid logins now cause an exponential increase in response time. The rate of
increase and maximum is configurable with the default settings of 1 minute wait
time after 15 invalid logins in 5 minutes.
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