Openwall crypt_blowfish insecure salt generation weak password hashes
| cryptblowfish-salt-weak-password-hashes (24590) |  Low Risk |
Description:
crypt_blowfish from Openwall create salts for extended-DES-based and MD5-based password hashes insecurely. An attacker could try candidate passwords against a stolen password file (obtained from a different vulnerability) at a slightly higher rate.
Through private correspondence, the vendor states this vulnerability is neither local nor remote, as this vulnerability can only be exploited in combination with another vulnerability or exposure.
Platforms Affected:
- Openwall, crypt_blowfish 0.4.7 and prior
- RedHat, Enterprise Linux 3 AS
- RedHat, Enterprise Linux 3 ES
- RedHat, Enterprise Linux 3 WS
- RedHat, Enterprise Linux 3 Desktop
- RedHat, Enterprise Linux 4 WS
- RedHat, Enterprise Linux 4 ES
- RedHat, Enterprise Linux 4 Desktop
- RedHat, Enterprise Linux 4 AS
Remedy:
Upgrade to the latest version of crypt_blowfish (1.0 or later), available from the crypt_blowfish Web site. See References.
For Red Hat Linux (Postgresql):
Refer to RHSA-2006:0526-8 for patch, upgrade, or suggested workaround information. See References.
Consequences:
Other
References:
- crypt_blowfish Web site, Modern password hashing for your software and your servers at http://www.openwall.com/crypt/.
- ASA-2006-113: postgresql security update (RHSA-2006-0526)
- CVE-2006-0591: The crypt_gensalt functions for BSDI-style extended DES-based and FreeBSD-sytle MD5-based password hashes in crypt_blowfish 0.4.7 and earlier 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.
- RHSA-2006-0526: postgresql security update
- SA18772: Openwall crypt_blowfish Salt Generation Weakness
- SA20653: Avaya Products PostgreSQL Multiple Vulnerabilities
- VUPEN/ADV-2006-0477: Openwall crypt_blowfish Password Hash Generation Security Weakness
Reported:
Feb 08, 2006
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