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2Wire Broadband Router Session Hijacking Vulnerability

1. OVERVIEW

The 2Wire Broadband Router is vulnerable to Session Hijacking flaw
which attackers can compromise the router administrator session.

2. PRODUCT DESCRIPTION

2Wire routers, product of 2Wire, are widely-used Broadband routers in
SOHO environment.
They are distributed through most famous ISPs (see -
http://2wire.com/?p=383) with ready-to-use pre-configured settings.
Their Wireless SSIDs are well-known as "2WIRE" prefix.

3. VULNERABILITY DESCRIPTION

The web-based management interface of 2Wire Broadband router does not
generate truely unique random session IDs for a logged-in
administrator user.
This allows attackers to brute-force guess a valid session ID to
compromise the administrator session.
For more information about this kind of weekness,
refer to CWE-330: Use of Insufficiently Random Values and CWE-331:
Insufficient Entropy.

4. VERSIONS AFFECTED

Tested against:
Model: 2700HGV-2 Gateway
Hardware Version: 2700-100657-005
Software Version: 5.29.117.3

Other versions might be affected as well.

5. PROOF-OF-CONCEPT/EXPLOIT

http://yehg.net/lab/pr0js/advisories/2wire/session_analysis/session_tokens_captured_webscarab
http://yehg.net/lab/pr0js/advisories/2wire/session_analysis/session_tokens_captured_burp
http://yehg.net/lab/pr0js/advisories/2wire/session_analysis/session_analysis_with_burp.jpg
http://yehg.net/lab/pr0js/advisories/2wire/session_analysis/session_analysis_with_burp-02.jpg
http://yehg.net/lab/pr0js/advisories/2wire/session_analysis/session_analysis_with_burp-03.jpg
http://yehg.net/lab/pr0js/advisories/2wire/session_analysis/session_analysis_with_burp-04.jpg

6. IMPACT

Attackers can compromise 2wire administrator session through automated
tools and modify any settings they want.

7. SOLUTION

There is no upgrade/patch currently available. 2wire support could not
estimate when the upgrade is available.
Also, 2wire users must be aware of other unfixed vulnerabilities
stated in references section.

8. VENDOR

2Wire Inc
http://www.2wire.com
About 2Wire - http://www.2wire.com/index.php?p=486

9. CREDIT

This vulnerability was discovered by Aung Khant, http://yehg.net, YGN
Ethical Hacker Group, Myanmar.

10. DISCLOSURE TIME-LINE

07-25-2010: vulnerability discovered
07-29-2010: notified vendor
08-02-2010: vendor responded/verified
08-09-2010: vendor did not respond when fix/upgrade would be available
08-09-2010: vulnerability disclosed

11. REFERENCES

Original Advisory URL:
http://yehg.net/lab/pr0js/advisories/2wire/[2wire]_session_hijacking_vulnerability
Other unfixed 2Wire Vulnerabilities: http://www.hakim.ws/
Related WebGoat Lesson:
http://yehg.net/lab/pr0js/training/view/owasp/webgoat/WebGoat_SessionMan_SessionHijackingWithJHijack/
http://jeremiahgrossman.blogspot.com/2008/04/intranet-hack-targeting-at-2wire-dsl.html
http://www.routerzone.eu/wiki/index.php/Hacking_the_2Wire_1800

#yehg [08-09-2010]