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CVE-2012-2317: The Debian php_crypt_revamped.patch patch for PHP 5.3.x, as used in the php5 package before 5.3.3-7+squeeze...

The Debian php_crypt_revamped.patch patch for PHP 5.3.x, as used in the php5 package before 5.3.3-7+squeeze4 in Debian GNU/Linux squeeze, the php5 package before 5.3.2-1ubuntu4.17 in Ubuntu 10.04 LTS, and the php5 package before 5.3.5-1ubuntu7.10 in Ubuntu 11.04, does not properly handle an empty salt string, which might allow remote attackers to bypass authentication by leveraging an application that relies on the PHP crypt function to choose a salt for password hashing.

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Glexia's TakeAutomated analysis

Security readout for executives and security teams

This issue affects old Debian/Ubuntu PHP 5 packages where a distro patch mishandled an empty password salt. In applications that used PHP crypt() in a way that lets PHP choose the salt, the bug could let a remote attacker bypass authentication. Exposure is narrow, but impact can be serious where legacy PHP authentication remains in service. Likely limited to legacy Debian squeeze, Ubuntu 10.04 LTS, or Ubuntu 11.04 systems running affected php5 builds and applications using PHP crypt() for password hashing with salt selection delegated or empty. Treat as a targeted legacy-system risk. Prioritize if any internet-facing authentication service still runs the named PHP packages; otherwise handle through legacy platform retirement and routine vulnerability management. Mitigation focus: Upgrade affected Debian or Ubuntu php5 packages to the fixed versions or later.; Retire or isolate unsupported Debian squeeze, Ubuntu 10.04, and Ubuntu 11.04 hosts.; Review authentication code that uses PHP crypt() for password hashing..

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