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SUSE Security Announcement

Package: imap Announcement-ID: SUSE-SA:2005:012 Date: Tue, 1 Mar 2005 10:00:00 +0000 Affected products: 8.2, 9.0, 9.1, 9.2 SUSE Linux Enterprise Server 8, 9 Vulnerability Type: remote authentication bypass Severity (1-10): 6 SUSE default package: no Cross References: CAN-2005-0198

Content of this advisory: 1) security vulnerability resolved: CRAM-MD5 authentication bug problem description 2) solution/workaround 3) special instructions and notes 4) package location and checksums 5) pending vulnerabilities, solutions, workarounds: See SUSE Security Summary Report. 6) standard appendix (further information)

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1) problem description, brief discussion

The University of Washington imap daemon can be used to access mails remotely using the IMAP protocol.

This update fixes a logical error in the challenge response authentication mechanism CRAM-MD5 used by UW IMAP. Due to this mistake a remote attacker can gain access to the IMAP server as arbitrary user.

This is tracked by the Mitre CVE ID CAN-2005-0198.

2) solution/workaround

None, please install the updated packages.

3) special instructions and notes

None.

4) package location and checksums

Please 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 to install from the maintenance web.

x86 Platform:

SUSE Linux 9.2: ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/imap-2004a-3.2.i586.rpm 2b4cf0f70fb0164a90f6e73b66f28c5a

SUSE Linux 9.1: ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/imap-2002e-92.4.i586.rpm 32eb45928cf31bb0cbae78139303561b

SUSE Linux 9.0: ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/imap-2002d-59.i586.rpm b8af4a9008cb1d311f650700b6d642c5

SUSE Linux 8.2: ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/imap-2002-56.i586.rpm 6f73b1197b2a095fc30b8afde860f5fe

x86-64 Platform:

SUSE Linux 9.2: ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/imap-2004a-3.2.x86_64.rpm a6a79a3e1459dd1d5799e40257684d4e source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/imap-2004a-3.2.src.rpm 18201a6f78b73d2250f6ea0e614049b2

SUSE Linux 9.1: ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/imap-2002e-92.4.x86_64.rpm 007c9777aacc36dec72067cf6ac39e7d source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/imap-2002e-92.4.src.rpm 9bf8dda300636e712f164d784bc131a5

SUSE Linux 9.0: ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/imap-2002d-59.x86_64.rpm 25ffa1aa178c962753bc26483d0e9354 source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/imap-2002d-59.src.rpm 2da3ea9899a1ddf909d7dc5059138e7d

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5) Pending vulnerabilities in SUSE Distributions and Workarounds:

See SUSE Security Summary Report.

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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 disrecommend to subscribe to security lists which cause the email 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 filename of the rpm package that you have downloaded. Of course, package authenticity verification can only target an un-installed 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. @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.

Type Bits/KeyID Date User ID pub 2048R/3D25D3D9 1999-03-06 SuSE Security Team security@suse.de pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key build@suse.de

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