Stay Secure with the Latest Linux Advisories

security advisorydenial of servicesecurity issue

Red Hat: RHSA-2009:1427-01 Moderate: Fetchmail Denial of Service Issue

An updated fetchmail package that fixes multiple security issues is now available for Red Hat Enterprise Linux 3, 4, and 5. This update has been rated as having moderate security impact by the Red Hat Security Response Team.. ==================================================================== Red Hat Security Advisory Synopsis: Moderate: fetchmail security update Advisory ID: RHSA-2009:1427-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2009:1427.html Issue date: 2009-09-08 CVE Names: CVE-2007-4565 CVE-2008-2711 CVE-2009-2666 ==================================================================== 1. Summary: An updated fetchmail package that fixes multiple security issues is now available for Red Hat Enterprise Linux 3, 4, and 5. This update has been rated as having moderate security impact by the Red Hat Security Response Team. 2. Relevant releases/architectures: Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64 Red Hat Desktop version 3 - i386, x86_64 Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64 Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64 Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64 Red Hat Enterprise Linux Desktop version 4 - i386, x86_64 Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64 Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64 RHEL Desktop Workstation (v. 5 client) - i386, x86_64 Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64 3. Description: Fetchmail is a remote mail retrieval and forwarding utility intended for use over on-demand TCP/IP links, such as SLIP and PPP connections. It was discovered that fetchmail is affected by the previously published "null prefix attack", caused by incorrect handling of NULL characters in X.509 certificates. If an attacker is able to get a carefully-crafted certificate signed by a trusted Certificate Authority, the attackercould use the certificate during a man-in-the-middle attack and potentially confuse fetchmail into accepting it by mistake. (CVE-2009-2666) A flaw was found in the way fetchmail handles rejections from a remote SMTP server when sending warning mail to the postmaster. If fetchmail sent a warning mail to the postmaster of an SMTP server and that SMTP server rejected it, fetchmail could crash. (CVE-2007-4565) A flaw was found in fetchmail. When fetchmail is run in double verbose mode ("-v -v"), it could crash upon receiving certain, malformed mail messages with long headers. A remote attacker could use this flaw to cause a denial of service if fetchmail was also running in daemon mode ("-d"). (CVE-2008-2711) Note: when using SSL-enabled services, it is recommended that the fetchmail "--sslcertck" option be used to enforce strict SSL certificate checking. All fetchmail users should upgrade to this updated package, which contains backported patches to correct these issues. If fetchmail is running in daemon mode, it must be restarted for this update to take effect (use the "fetchmail --quit" command to stop the fetchmail process). 4. Solution: Before applying this update, make sure that all previously-released errata relevant to your system have been applied. This update is available via Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at 5. Bugs fixed (http://bugzilla.redhat.com/): 260601 - CVE-2007-4565 Fetchmail NULL pointer dereference 451758 - CVE-2008-2711 fetchmail: Crash in large log messages in verbose mode 515804 - CVE-2009-2666 fetchmail: SSL null terminator bypass 6. Package List: Red Hat Enterprise Linux AS version3: Source: i386: fetchmail-6.2.0-3.el3.5.i386.rpm fetchmail-debuginfo-6.2.0-3.el3.5.i386.rpm ia64: fetchmail-6.2.0-3.el3.5.ia64.rpm fetchmail-debuginfo-6.2.0-3.el3.5.ia64.rpm ppc: fetchmail-6.2.0-3.el3.5.ppc.rpm fetchmail-debuginfo-6.2.0-3.el3.5.ppc.rpm s390: fetchmail-6.2.0-3.el3.5.s390.rpm fetchmail-debuginfo-6.2.0-3.el3.5.s390.rpm s390x: fetchmail-6.2.0-3.el3.5.s390x.rpm fetchmail-debuginfo-6.2.0-3.el3.5.s390x.rpm x86_64: fetchmail-6.2.0-3.el3.5.x86_64.rpm fetchmail-debuginfo-6.2.0-3.el3.5.x86_64.rpm Red Hat Desktop version 3: Source: i386: fetchmail-6.2.0-3.el3.5.i386.rpm fetchmail-debuginfo-6.2.0-3.el3.5.i386.rpm x86_64: fetchmail-6.2.0-3.el3.5.x86_64.rpm fetchmail-debuginfo-6.2.0-3.el3.5.x86_64.rpm Red Hat Enterprise Linux ES version 3: Source: i386: fetchmail-6.2.0-3.el3.5.i386.rpm fetchmail-debuginfo-6.2.0-3.el3.5.i386.rpm ia64: fetchmail-6.2.0-3.el3.5.ia64.rpm fetchmail-debuginfo-6.2.0-3.el3.5.ia64.rpm x86_64: fetchmail-6.2.0-3.el3.5.x86_64.rpm fetchmail-debuginfo-6.2.0-3.el3.5.x86_64.rpm Red Hat Enterprise Linux WS version 3: Source: i386: fetchmail-6.2.0-3.el3.5.i386.rpm fetchmail-debuginfo-6.2.0-3.el3.5.i386.rpm ia64: fetchmail-6.2.0-3.el3.5.ia64.rpm fetchmail-debuginfo-6.2.0-3.el3.5.ia64.rpm x86_64: fetchmail-6.2.0-3.el3.5.x86_64.rpm fetchmail-debuginfo-6.2.0-3.el3.5.x86_64.rpm Red Hat Enterprise Linux AS version 4: Source: i386: fetchmail-6.2.5-6.0.1.el4_8.1.i386.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.i386.rpm ia64: fetchmail-6.2.5-6.0.1.el4_8.1.ia64.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.ia64.rpm ppc: fetchmail-6.2.5-6.0.1.el4_8.1.ppc.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.ppc.rpm s390: fetchmail-6.2.5-6.0.1.el4_8.1.s390.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.s390.rpm s390x: fetchmail-6.2.5-6.0.1.el4_8.1.s390x.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.s390x.rpm x86_64: fetchmail-6.2.5-6.0.1.el4_8.1.x86_64.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.x86_64.rpm Red Hat Enterprise Linux Desktop version4: Source: i386: fetchmail-6.2.5-6.0.1.el4_8.1.i386.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.i386.rpm x86_64: fetchmail-6.2.5-6.0.1.el4_8.1.x86_64.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.x86_64.rpm Red Hat Enterprise Linux ES version 4: Source: i386: fetchmail-6.2.5-6.0.1.el4_8.1.i386.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.i386.rpm ia64: fetchmail-6.2.5-6.0.1.el4_8.1.ia64.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.ia64.rpm x86_64: fetchmail-6.2.5-6.0.1.el4_8.1.x86_64.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.x86_64.rpm Red Hat Enterprise Linux WS version 4: Source: i386: fetchmail-6.2.5-6.0.1.el4_8.1.i386.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.i386.rpm ia64: fetchmail-6.2.5-6.0.1.el4_8.1.ia64.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.ia64.rpm x86_64: fetchmail-6.2.5-6.0.1.el4_8.1.x86_64.rpm fetchmail-debuginfo-6.2.5-6.0.1.el4_8.1.x86_64.rpm RHEL Desktop Workstation (v. 5 client): Source: i386: fetchmail-6.3.6-1.1.el5_3.1.i386.rpm fetchmail-debuginfo-6.3.6-1.1.el5_3.1.i386.rpm x86_64: fetchmail-6.3.6-1.1.el5_3.1.x86_64.rpm fetchmail-debuginfo-6.3.6-1.1.el5_3.1.x86_64.rpm Red Hat Enterprise Linux (v. 5 server): Source: i386: fetchmail-6.3.6-1.1.el5_3.1.i386.rpm fetchmail-debuginfo-6.3.6-1.1.el5_3.1.i386.rpm ia64: fetchmail-6.3.6-1.1.el5_3.1.ia64.rpm fetchmail-debuginfo-6.3.6-1.1.el5_3.1.ia64.rpm ppc: fetchmail-6.3.6-1.1.el5_3.1.ppc.rpm fetchmail-debuginfo-6.3.6-1.1.el5_3.1.ppc.rpm s390x: fetchmail-6.3.6-1.1.el5_3.1.s390x.rpm fetchmail-debuginfo-6.3.6-1.1.el5_3.1.s390x.rpm x86_64: fetchmail-6.3.6-1.1.el5_3.1.x86_64.rpm fetchmail-debuginfo-6.3.6-1.1.el5_3.1.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key#package 7. References: https://www.cve.org/CVERecord?id=CVE-2007-4565 https://www.cve.org/CVERecord?id=CVE-2008-2711 https://www.cve.org/CVERecord?id=CVE-2009-2666 https://access.redhat.com/security/updates/classification#moderate 8.Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact Copyright 2009 Red Hat, Inc. . Recent fetchmail update for Red Hat addresses moderate vulnerabilities across multiple iterations. Urgent attention advised.. Fetchmail Security Update, Red Hat Enterprise Linux, Email Retrieval. . LinuxSecurity.com Team

Sep 08, 2009 Red Hat