Advisory Published

RHSA-2011:0843: Moderate: postfix security update

First published: Tue May 31 2011(Updated: )

Postfix is a Mail Transport Agent (MTA), supporting LDAP, SMTP AUTH (SASL),<br>and TLS.<br>A heap-based buffer over-read flaw was found in the way Postfix performed<br>SASL handlers management for SMTP sessions, when Cyrus SASL authentication<br>was enabled. A remote attacker could use this flaw to cause the Postfix<br>smtpd server to crash via a specially-crafted SASL authentication request.<br>The smtpd process was automatically restarted by the postfix master process<br>after the time configured with service_throttle_time elapsed.<br>(CVE-2011-1720)<br>Note: Cyrus SASL authentication for Postfix is not enabled by default.<br>Red Hat would like to thank the CERT/CC for reporting this issue. Upstream<br>acknowledges Thomas Jarosch of Intra2net AG as the original reporter.<br>Users of Postfix are advised to upgrade to these updated packages, which<br>contain a backported patch to resolve this issue. After installing this<br>update, the postfix service will be restarted automatically.<br>

Affected SoftwareAffected VersionHow to fix
redhat/postfix<2.6.6-2.2.el6_1
2.6.6-2.2.el6_1
redhat/postfix<2.6.6-2.2.el6_1
2.6.6-2.2.el6_1
redhat/postfix-debuginfo<2.6.6-2.2.el6_1
2.6.6-2.2.el6_1
redhat/postfix-perl-scripts<2.6.6-2.2.el6_1
2.6.6-2.2.el6_1
redhat/postfix-debuginfo<2.6.6-2.2.el6_1
2.6.6-2.2.el6_1
redhat/postfix-perl-scripts<2.6.6-2.2.el6_1
2.6.6-2.2.el6_1
redhat/postfix<2.3.3-2.3.el5_6
2.3.3-2.3.el5_6
redhat/postfix<2.3.3-2.3.el5_6
2.3.3-2.3.el5_6
redhat/postfix-pflogsumm<2.3.3-2.3.el5_6
2.3.3-2.3.el5_6
redhat/postfix-pflogsumm<2.3.3-2.3.el5_6
2.3.3-2.3.el5_6
redhat/postfix<2.2.10-1.5.el4
2.2.10-1.5.el4
redhat/postfix<2.2.10-1.5.el4
2.2.10-1.5.el4
redhat/postfix-pflogsumm<2.2.10-1.5.el4
2.2.10-1.5.el4
redhat/postfix-pflogsumm<2.2.10-1.5.el4
2.2.10-1.5.el4

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Reference Links

Frequently Asked Questions

  • What is the severity of RHSA-2011:0843?

    The severity of RHSA-2011:0843 is classified as moderate.

  • How do I fix RHSA-2011:0843?

    To fix RHSA-2011:0843, upgrade Postfix and its related packages to version 2.6.6-2.2.el6_1 or the specified remedial versions.

  • Which versions of Postfix are affected by RHSA-2011:0843?

    The affected versions of Postfix in RHSA-2011:0843 include 2.6.6 and 2.3.3 and earlier versions.

  • What type of vulnerability is cited in RHSA-2011:0843?

    RHSA-2011:0843 describes a heap-based buffer over-read flaw in Postfix when using Cyrus SASL authentication.

  • Can RHSA-2011:0843 be exploited remotely?

    Yes, a remote attacker could potentially exploit the vulnerability outlined in RHSA-2011:0843 if SASL authentication is enabled.

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