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phpBB "gen_rand_string()" Predictable RNG Weakness
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Secunia Advisory:
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SA18727
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Release Date:
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2006-02-07
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Last Update:
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2006-04-10
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Popularity:
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37,208 views
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Critical:
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Not critical
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Impact:
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Manipulation of data
Brute force
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | phpBB 2.x
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| CVE reference: | CVE-2006-0632
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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
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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