REDHAT-BUG-699035

First published: Fri Apr 22 2011(Updated: )

A heap-based buffer overread flaw was found in the way Postfix mail transport agent performed SASL handlers management for SMTP sessions, when the Cyrus SASL authentication was enabled. A remote attacker could use this flaw to cause Postfix smtpd server crash via specially-crafted SASL authentication request. Note: The default configuration of Postfix mail transport agent, as shipped with Red Hat Enterprise Linux 4, 5, and 6 do not enable SASL support for SMTP authentication for mail clients (thus Postfix server instances using it are not vulnerable to this flaw). Workaround: If your Postfix server configuration contains directive like: smtpd_sasl_auth_enable = yes change 'yes' to 'no' or comment the whole line out not to be vulnerable to this flaw.

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