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Openwall crypt_blowfish Salt Generation Weakness
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Secunia Advisory:
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SA18772
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Release Date:
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2006-02-08
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Last Update:
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2006-02-20
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Critical:
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Not critical
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Impact:
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Security Bypass
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Where:
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Local system
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Solution Status:
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Vendor Patch
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| Software: | Openwall crypt_blowfish 0.x
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| | CVE reference: | CVE-2006-0591 (Secunia mirror)
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Description:
A weakness has been reported in Openwall crypt_blowfish, which potentially can be exploited by malicious, local users to bypass certain security restrictions.
The weakness is caused due to signedness errors in crypt_gensalt.c. This increases the probability that certain extended-DES-based and MD5-based password hashes are generated using the same salt.
Successful exploitation allows the hashes to be tested against candidate passwords at a faster effective rate but requires access to the password file.
The weakness has been reported in version 0.4.7 and prior.
Solution:
Update to version 1.0
http://www.openwall.com/crypt/
Provided and/or discovered by:
The vendor credits Marko Kreen.
Changelog:
2006-02-09: Added CVE reference.
2006-02-20: Updated Advisory.
Original Advisory:
http://cvsweb.openwall.com/cgi/cvsweb...lt.c?only_with_tag=CRYPT_BLOWFISH_1_0
http://article.gmane.org/gmane.comp.security.bugtraq/21754
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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.
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