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phpBB "gen_rand_string()" Predictable RNG Weakness Advisory Available in Danish 

Secunia Advisory: SA18727  
Release Date: 2006-02-07
Last Update: 2006-04-10

Critical:
Not critical
Impact: Manipulation of data
Brute force
Where: From remote
Solution Status: Vendor Patch

Software:phpBB 2.x

CVE reference:CVE-2006-0632 (Secunia mirror)

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Description:
Chinchilla has reported a weakness in phpBB, which potentially can be exploited by malicious people to change other user's passwords.

The weakness is caused due to the "gen_rand_string()" function generating predictable random numbers. This can e.g. be exploited to change a user's password via the "I forgot my password" functionality by sending a large amount of requests attempting to brute force the validation ID (in worst case 1000000).

Successful exploitation requires knowledge of a user's username and e-mail address (e-mail address not visible by default to other users).

Some other issues which may be security related have also been reported by the vendor.

The weakness has been reported in version 2.0.19 and prior. Other versions may also be affected.

Solution:
Update to version 2.0.20.
http://www.phpbb.com/downloads.php

Provided and/or discovered by:
Chinchilla

Changelog:
2006-02-14: Added CVE reference.
2006-04-10: Updated "Description" and "Solution" sections.

Original Advisory:
http://www.r-security.net/tutorials/view/readtutorial.php?id=4



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

37 Related Secunia Security Advisories, displaying 10

1. phpBB Private Message Deletion Cross-Site Request Forgery
2. phpBB privmsg.php Cross-Site Request Forgery and Cross-Site Scripting
3. phpBB "avatar_path" PHP Code Execution Vulnerability
4. phpBB "Upload Avatar from a URL" Weakness and PHP Code Execution
5. phpBB "cur_password" Cross-Site Scripting Vulnerability
6. phpBB "Referer" Header Session ID Disclosure
7. phpBB "url" bbcode Script Insertion Vulnerability
8. phpBB "Allow HTML" Script Insertion Security Issue
9. phpBB Multiple Vulnerabilities
10. phpBB Avatar Script Insertion Vulnerability

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