A security weakness has been identified in Openwall crypt_blowfish, which could be exploited by attackers to bypass security restrictions. This issue is due to an error in the "crypt_gensalt" functions for BSDI-style extended DES-based and FreeBSD-sytle MD5-based password hashes that do not evenly and randomly distribute salts, which makes it easier for attackers to guess passwords from a stolen password file due to the increased number of collisions.
Credits
Vulnerability reported by Marko Kreen
ChangeLog
2006-02-08 : Initial release
2006-04-02 : Updated Advisory
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