SUSE Security Announcement: uw-imap authentication bypass
Posted on: 03/01/2005 03:49 AM

A Security Announcement from SUSE:

______________________________________________________________________________

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)

______________________________________________________________________________

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


______________________________________________________________________________

5) Pending vulnerabilities in SUSE Distributions and Workarounds:

See SUSE Security Summary Report.

______________________________________________________________________________

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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