Issued:

2011-06-08

Updated:

2011-06-08

RHSA-2011:0859 - Moderate: cyrus-imapd security update

Synopsis

Moderate: cyrus-imapd security update

Type/Severity

Security Advisory Moderate

Topic

Updated cyrus-imapd packages that fix one security issue are now available for Red Hat Enterprise Linux 4, 5, and 6.

The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

Description

The cyrus-imapd packages contain a high-performance mail server with IMAP, POP3, NNTP, and Sieve support.

It was discovered that cyrus-imapd did not flush the received commands buffer after switching to TLS encryption for IMAP, LMTP, NNTP, and POP3 sessions. A man-in-the-middle attacker could use this flaw to inject protocol commands into a victim's TLS session initialization messages. This could lead to those commands being processed by cyrus-imapd, potentially allowing the attacker to steal the victim's mail or authentication credentials. (CVE-2011-1926)

Users of cyrus-imapd are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. After installing the update, cyrus-imapd will be restarted automatically.

Solution

Before applying this update, make sure all previously-released errata relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at This content is not included.https://access.redhat.com/kb/docs/DOC-11259

Affected Products

Updated Packages

• cyrus-imapd-2.3.7-7.el5_6.4.ppc.rpm
• cyrus-imapd-murder-2.2.12-15.el4.s390.rpm
• cyrus-imapd-nntp-2.2.12-15.el4.i386.rpm
• cyrus-imapd-2.2.12-15.el4.ppc.rpm
• cyrus-imapd-utils-2.2.12-15.el4.s390.rpm
• cyrus-imapd-2.3.7-7.el5_6.4.x86_64.rpm
• cyrus-imapd-2.2.12-15.el4.s390x.rpm
• cyrus-imapd-devel-2.2.12-15.el4.x86_64.rpm
• cyrus-imapd-2.3.7-7.el5_6.4.src.rpm
• cyrus-imapd-nntp-2.2.12-15.el4.s390x.rpm
• cyrus-imapd-2.2.12-15.el4.s390.rpm
• cyrus-imapd-utils-2.2.12-15.el4.x86_64.rpm
• cyrus-imapd-utils-2.3.7-7.el5_6.4.x86_64.rpm
• cyrus-imapd-devel-2.3.16-6.el6_1.2.ppc.rpm
• cyrus-imapd-utils-2.3.16-6.el6_1.2.ppc64.rpm
• cyrus-imapd-perl-2.3.7-7.el5_6.4.ia64.rpm
• cyrus-imapd-murder-2.2.12-15.el4.i386.rpm
• cyrus-imapd-utils-2.2.12-15.el4.i386.rpm
• cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.s390.rpm
• cyrus-imapd-utils-2.3.16-6.el6_1.2.s390x.rpm
• cyrus-imapd-2.3.7-7.el5_6.4.ia64.rpm
• cyrus-imapd-nntp-2.2.12-15.el4.x86_64.rpm
• cyrus-imapd-utils-2.3.7-7.el5_6.4.ia64.rpm
• cyrus-imapd-utils-2.3.7-7.el5_6.4.i386.rpm
• cyrus-imapd-devel-2.3.7-7.el5_6.4.x86_64.rpm
• cyrus-imapd-devel-2.3.16-6.el6_1.2.ppc64.rpm
• cyrus-imapd-nntp-2.2.12-15.el4.s390.rpm
• cyrus-imapd-perl-2.3.7-7.el5_6.4.s390x.rpm
• cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.i686.rpm
• cyrus-imapd-2.2.12-15.el4.src.rpm
• cyrus-imapd-utils-2.2.12-15.el4.ppc.rpm
• cyrus-imapd-devel-2.3.7-7.el5_6.4.s390.rpm
• cyrus-imapd-2.2.12-15.el4.x86_64.rpm
• cyrus-imapd-nntp-2.2.12-15.el4.ppc.rpm
• perl-Cyrus-2.2.12-15.el4.i386.rpm
• cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.ppc.rpm
• cyrus-imapd-utils-2.2.12-15.el4.ia64.rpm
• cyrus-imapd-perl-2.3.7-7.el5_6.4.ppc.rpm
• perl-Cyrus-2.2.12-15.el4.s390.rpm
• cyrus-imapd-devel-2.3.7-7.el5_6.4.ppc64.rpm
• cyrus-imapd-2.3.7-7.el5_6.4.s390x.rpm
• cyrus-imapd-devel-2.3.7-7.el5_6.4.ppc.rpm
• cyrus-imapd-utils-2.3.7-7.el5_6.4.ppc.rpm
• cyrus-imapd-devel-2.3.16-6.el6_1.2.i686.rpm
• cyrus-imapd-perl-2.3.7-7.el5_6.4.i386.rpm
• cyrus-imapd-murder-2.2.12-15.el4.s390x.rpm
• cyrus-imapd-utils-2.2.12-15.el4.s390x.rpm
• cyrus-imapd-devel-2.3.16-6.el6_1.2.s390x.rpm
• perl-Cyrus-2.2.12-15.el4.ia64.rpm
• cyrus-imapd-2.2.12-15.el4.i386.rpm
• cyrus-imapd-perl-2.3.7-7.el5_6.4.x86_64.rpm
• cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.ppc64.rpm
• cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.x86_64.rpm
• cyrus-imapd-devel-2.2.12-15.el4.i386.rpm
• perl-Cyrus-2.2.12-15.el4.x86_64.rpm
• cyrus-imapd-murder-2.2.12-15.el4.ppc.rpm
• cyrus-imapd-utils-2.3.7-7.el5_6.4.s390x.rpm
• cyrus-imapd-utils-2.3.16-6.el6_1.2.i686.rpm
• cyrus-imapd-murder-2.2.12-15.el4.x86_64.rpm
• cyrus-imapd-devel-2.3.7-7.el5_6.4.i386.rpm
• cyrus-imapd-devel-2.3.7-7.el5_6.4.s390x.rpm
• cyrus-imapd-2.3.16-6.el6_1.2.s390x.rpm
• cyrus-imapd-devel-2.2.12-15.el4.s390.rpm
• cyrus-imapd-utils-2.3.16-6.el6_1.2.x86_64.rpm
• cyrus-imapd-nntp-2.2.12-15.el4.ia64.rpm
• cyrus-imapd-2.3.16-6.el6_1.2.ppc64.rpm
• cyrus-imapd-murder-2.2.12-15.el4.ia64.rpm
• cyrus-imapd-2.3.7-7.el5_6.4.i386.rpm
• cyrus-imapd-2.2.12-15.el4.ia64.rpm
• cyrus-imapd-2.3.16-6.el6_1.2.i686.rpm
• cyrus-imapd-devel-2.3.7-7.el5_6.4.ia64.rpm
• cyrus-imapd-2.3.16-6.el6_1.2.src.rpm
• cyrus-imapd-devel-2.2.12-15.el4.s390x.rpm
• cyrus-imapd-devel-2.2.12-15.el4.ppc.rpm
• perl-Cyrus-2.2.12-15.el4.ppc.rpm
• perl-Cyrus-2.2.12-15.el4.s390x.rpm
• cyrus-imapd-devel-2.2.12-15.el4.ia64.rpm
• cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.s390x.rpm
• cyrus-imapd-devel-2.3.16-6.el6_1.2.s390.rpm
• cyrus-imapd-devel-2.3.16-6.el6_1.2.x86_64.rpm
• cyrus-imapd-2.3.16-6.el6_1.2.x86_64.rpm

Fixes

• This content is not included.BZ - 705288

CVEs

• CVE-2011-1926

References

• https://access.redhat.com/security/updates/classification/#moderate

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.