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PAM-MySQL contains a double-free vulnerability

Vulnerability Note VU#693909

Original Release Date: 2006-02-09 | Last Revised: 2006-05-17


PAM-MySQL contains a double-free vulnerability that may allow a remote attacker to execute arbitrary code or cause a denial-of-service condition.


PAM-MySQL provides a Pluggable Authentication Module (PAM) interface to a MySQL database. PAM-MySQL does not securely handle a pointer returned by the pam_get_item() routine, which results in a double-free vulnerability. The vulnerability exists if the following conditions are present:

    1. Two or more PAM modules are stacked.
    2. The PAM-MySQL module is not the first in the stack.
    3. Any of the modules preceding the PAM-MySQL module are not marked as requisite.


    If a remote attacker supplies a specially crafted password to a vulnerable PAM-MySQL installation, that attacker may be able to crash the PAM-MySQL process. Note that it may be possible to exploit this vulnerability to execute arbitrary code.


    Upgrade PAM-MySQLUpgrading to PAM-MySQL version 0.6.2 or PAM-MySQL version 0.7pre3 will correct this issue. 

    Vendor Information


    Ricoh Corporation Not Affected

    Updated:  May 17, 2006


    Not Affected

    Vendor Statement

    We have not received a statement from the vendor.

    Vendor Information

    The vendor has not provided us with any further information regarding this vulnerability.

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    This vulnerability was reported by Moriyoshi Koizumi.

    This document was written by Jeff Gennari.

    Other Information

    CVE IDs: CVE-2006-0056
    Severity Metric: 3.94
    Date Public: 2005-09-28
    Date First Published: 2006-02-09
    Date Last Updated: 2006-05-17 11:56 UTC
    Document Revision: 38

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