A cyrus-imapd update is available for SUSE Linux _____________________________________________________________________________ SUSE Security Announcement Package: cyrus-imapd Announcement-ID: SUSE-SA:2004:043 Date: Friday, Dec 3rd 2004 13:00 MEST Affected products: 8.1, 8.2, 9.0, 9.1, 9.2 SUSE Linux Enterprise Server 8, 9 SuSE-Linux-Standard-Server 8 SuSE Linux Openexchange Server 4 Vulnerability Type: remote command execution Severity (1-10): 5 SUSE default package: No Cross References: CAN-2004-1011 CAN-2004-1012 CAN-2004-1013 Content of this advisory: 1) security vulnerability resolved: - buffer overflow and out of bounds access in cyrus imapd problem description 2) solution/workaround 3) special instructions and notes 4) package location and checksums 5) pending vulnerabilities, solutions, workarounds: - suidperl - putty 6) standard appendix (further information)



______________________________________________________________________________ 1) problem description, brief discussion Stefan Esser reported various bugs within the Cyrus IMAP Server. These include buffer overflows and out-of-bounds memory access which could allow remote attackers to execute arbitrary commands as root. The bugs occur in the pre-authentication phase, therefore an update is strongly recommended. 2) solution/workaround There is no temporary workaround except shutting down the IMAP server. 3) special instructions and notes After successfully updating the cyrus-imapd package you have to issue the following command as root: /sbin/rccyrus restart 4) package location and checksums Download the update package for your distribution and verify its integrity by the methods listed in section 3) of this announcement. Then, install the package using the command "rpm -Fhv file.rpm" to apply the update. Our maintenance customers are being notified individually. The packages are being offered for installation from the maintenance web. x86 Platform: SUSE Linux 9.2: ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/cyrus-imapd-2.2.8-6.3.i586.rpm 563c7c359df3e4572c27bccd1c4962eb patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/cyrus-imapd-2.2.8-6.3.i586.patch.rpm ceee2a62831855a563c56a0d7be12a6d source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/cyrus-imapd-2.2.8-6.3.src.rpm c24904edebe628e9dab9b805af56359a SUSE Linux 9.1: ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/cyrus-imapd-2.2.3-83.19.i586.rpm 53af4c594493abca71bd2789c6599019 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/cyrus-imapd-2.2.3-83.19.i586.patch.rpm 2c596ce65de5d13c0ca14459e0462bd9 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/cyrus-imapd-2.2.3-83.19.src.rpm 015268204791fc27c128705b1a22ca37 SUSE Linux 9.0: ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/cyrus-imapd-2.1.15-89.i586.rpm ed3c4bc9178eea7ad5a8a406d53a230d patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/cyrus-imapd-2.1.15-89.i586.patch.rpm b1ddc189663da719ec5d55ea186b795b source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/cyrus-imapd-2.1.15-89.src.rpm 6692959f014ed63d0c83ca02632e456b SUSE Linux 8.2: ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/cyrus-imapd-2.1.12-75.i586.rpm 09223533665db543be3e85b53b89b50a patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/cyrus-imapd-2.1.12-75.i586.patch.rpm c4606d6b48577af54486c40fb35a31b9 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/cyrus-imapd-2.1.12-75.src.rpm beb341ef93888c1f1e3f6e6532109b0d SUSE Linux 8.1: ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cyrus-imapd-2.1.16-56.i586.rpm 2d5c5cc7de173ff8153544166a19533c patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cyrus-imapd-2.1.16-56.i586.patch.rpm 8d1cc9bea8f323c15b982dfc43df7b6c source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/cyrus-imapd-2.1.16-56.src.rpm bd1e20bd42974bbe9f8e3aee826a4444 x86-64 Platform: SUSE Linux 9.2: ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/cyrus-imapd-2.2.8-6.3.x86_64.rpm 57bd598694d82f7f52af34659773d890 patch rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/cyrus-imapd-2.2.8-6.3.x86_64.patch.rpm 9702a0541440af888aead910120085af source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/src/cyrus-imapd-2.2.8-6.3.src.rpm c24904edebe628e9dab9b805af56359a SUSE Linux 9.1: ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/cyrus-imapd-2.2.3-83.19.x86_64.rpm d279dd8620493482cba6b4706ea6124d patch rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/cyrus-imapd-2.2.3-83.19.x86_64.patch.rpm 33184f8fb2dfeb4f27fe506ee204ee82 source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/cyrus-imapd-2.2.3-83.19.src.rpm 742352f41f57c4b3221e0672e31f865f SUSE Linux 9.0: ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/cyrus-imapd-2.1.15-89.x86_64.rpm d9e387c4161fdeef2680508d17df159a patch rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/cyrus-imapd-2.1.15-89.x86_64.patch.rpm 4411a55662c6567ba48055c72d9ebd1d source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/cyrus-imapd-2.1.15-89.src.rpm 42cc2346b342320e77be923ee12c5678 ______________________________________________________________________________ 5) Pending vulnerabilities in SUSE Distributions and Workarounds: - suidperl SUSE LINUX 9.2 follows the new upstream policy to install /usr/bin/suidperl as hardlink to /usr/bin/perl. In previous perl versions it used to be a hardlink to /usr/bin/sperl*. Therefore one must not set a setuid bit on /usr/bin/suidperl as suggested in the RPM package description of perl. Set the bit on /usr/bin/sperl5.8.5 instead if you really need the suid feature. Also check your /etc/permissions.local file for references of /usr/bin/suidperl if you where upgrading from previous SUSE LINUX releases. SUSE Linux is not affected by this problem in the default installation, only if the administrator added the s-bit to suidperl. - putty The SUSE LINUX distribution comes with putty a Windows-based SSH and Telnet client. This client is vulnerable to a buffer overflow that can be exploited by a malicious SSH server to execute arbitrary code remotely. Putty is just included on the CDs/DVDs and is not installed on the Linux system. Upcoming distributions will have this vulnerability fixed. ______________________________________________________________________________ 6) standard appendix: authenticity verification, additional information - Package authenticity verification: SUSE update packages are available on many mirror ftp servers all over the world. While this service is being considered valuable and important to the free and open source software community, many users wish to be sure about the origin of the package and its content before installing the package. There are two verification methods that can be used independently from each other to prove the authenticity of a downloaded file or rpm package: 1) md5sums as provided in the (cryptographically signed) announcement. 2) using the internal gpg signatures of the rpm package. 1) execute the command md5sum <name-of-the-file.rpm> after you downloaded the file from a SUSE ftp server or its mirrors. Then, compare the resulting md5sum with the one that is listed in the announcement. Since the announcement containing the checksums is cryptographically signed (usually using the key security@suse.de), the checksums show proof of the authenticity of the package. We recommend against subscribing to security lists that cause the e-mail message containing the announcement to be modified so that the signature does not match after transport through the mailing list software. Downsides: You must be able to verify the authenticity of the announcement in the first place. If RPM packages are being rebuilt and a new version of a package is published on the ftp server, all md5 sums for the files are useless. 2) rpm package signatures provide an easy way to verify the authenticity of an rpm package. Use the command rpm -v --checksig <file.rpm> to verify the signature of the package, where <file.rpm> is the file name of the rpm package that you have downloaded. Of course, package authenticity verification can only target an uninstalled rpm package file. Prerequisites: a) gpg is installed b) The package is signed using a certain key. The public part of this key must be installed by the gpg program in the directory ~/.gnupg/ under the user's home directory who performs the signature verification (usually root). You can import the key that is used by SUSE in rpm packages for SUSE Linux by saving this announcement to a file ("announcement.txt") and running the command (do "su -" to be root): gpg --batch; gpg < announcement.txt | gpg --import SUSE Linux distributions version 7.1 and thereafter install the key "build@suse.de" upon installation or upgrade, provided that the package gpg is installed. The file containing the public key is placed at the top-level directory of the first CD (pubring.gpg) and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de . - SUSE runs two security mailing lists to which any interested party may subscribe: suse-security@suse.com - general/linux/SUSE security discussion. All SUSE security announcements are sent to this list. To subscribe, send an email to <suse-security-subscribe@suse.com>. suse-security-announce@suse.com - SUSE's announce-only mailing list. Only SUSE's security announcements are sent to this list. To subscribe, send an email to <suse-security-announce-subscribe@suse.com>. For general information or the frequently asked questions (faq) send mail to: <suse-security-info@suse.com> or <suse-security-faq@suse.com> respectively. ==================================================================== SUSE's security contact is <security@suse.com> or <security@suse.de>. The <security@suse.de> public key is listed below. ==================================================================== ______________________________________________________________________________ The information in this advisory may be distributed or reproduced, provided that the advisory is not modified in any way. In particular, it is desired that the clear-text signature shows proof of the authenticity of the text. SUSE Linux AG makes no warranties of any kind whatsoever with respect to the information contained in this security advisory. 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