SUSE Security Announcement: clamav update (SUSE-SA:2007:026)
Posted on: 04/20/2007 04:50 PM

A security announcement from SUSE

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______________________________________________________________________________

SUSE Security Announcement

Package: clamav
Announcement ID: SUSE-SA:2007:026
Date: Fri, 20 Apr 2007 15:00:00 +0000
Affected Products: SUSE LINUX 9.3
SUSE LINUX 10.0
SUSE LINUX 10.1
openSUSE 10.2
SUSE SLES 9
Open Enterprise Server
Novell Linux POS 9
SUSE SLES 10
Vulnerability Type: remote code execution
Severity (1-10): 7
SUSE Default Package: no
Cross-References: CVE-2007-1745, CVE-2007-1997

Content of This Advisory:
1) Security Vulnerability Resolved:
clamav version upgrade to 0.90.2
Problem Description
2) Solution or Work-Around
3) Special Instructions and Notes
4) Package Location and Checksums
5) Pending Vulnerabilities, Solutions, and Work-Arounds:
See SUSE Security Summary Report.
6) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Problem Description and Brief Discussion

The AntiVirus scan engine clamav was updated to version 0.90.2. Among
other bugs two security problems were fixed which could cause a remote
denial of service attack against clamav or potentially be used to
execute code.

- CVE-2007-1745: The chm_decompress_stream function in
libclamav/chmunpack.c leaks file descriptors, which has unknown
impact and attack vectors involving a crafted CHM file.

- CVE-2007-1997: Integer signedness error in the (1) cab_unstore and
(2) cab_extract functions in libclamav/cab.c might allow remote
attackers to execute arbitrary code via a crafted CHM file that
contains a negative integer, which passes a signed comparison and
leads to a stack-based buffer overflow.

Updates for this problem were released on Tuesday April 17.

2) Solution or Work-Around

There is no known workaround, please install the update packages.

3) Special Instructions and Notes

None.

4) Package Location and Checksums

The preferred method for installing security updates is to use the YaST
Online Update (YOU) tool. YOU detects which updates are required and
automatically performs the necessary steps to verify and install them.
Alternatively, download the update packages for your distribution manually
and verify their integrity by the methods listed in Section 6 of this
announcement. Then install the packages using the command

rpm -Fhv <file.rpm>

to apply the update, replacing <file.rpm> with the filename of the
downloaded RPM package.


x86 Platform:

openSUSE 10.2:
ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/clamav-0.90.2-0.1.i586.rpm
665649e5d1b5f2e2ec072ff6e5acff96

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/i586/clamav-0.90.2-0.2.i586.rpm
a3e3616c1dd19b09be4ae1be22279221

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/clamav-0.90.2-0.1.i586.rpm
3a1aefec54a30a216a46399d46c4dfa5

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/clamav-0.90.2-0.1.i586.rpm
31696e4e0837aab02429695bbb11093d

Power PC Platform:

openSUSE 10.2:
ftp://ftp.suse.com/pub/suse/update/10.2/rpm/ppc/clamav-0.90.2-0.1.ppc.rpm
1a497a6200da361e3799f4f2ab4091e7

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/ppc/clamav-0.90.2-0.2.ppc.rpm
12c6ed4e2cbb5405838deb2e22bced54

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/clamav-0.90.2-0.1.ppc.rpm
704a40de922c2eb8c5841c40fe19050c

x86-64 Platform:

openSUSE 10.2:
ftp://ftp.suse.com/pub/suse/update/10.2/rpm/x86_64/clamav-0.90.2-0.1.x86_64.rpm
641d35e63c0ce45bb86099a4a26d4fe6

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/clamav-0.90.2-0.2.x86_64.rpm
14ee14fc3cbcf9f08937b97998441bef

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/clamav-0.90.2-0.1.x86_64.rpm
ca599326fc97e05e41e6ac793ee63c21

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/clamav-0.90.2-0.1.x86_64.rpm
1a00a64d6b88ce2465b65d61cf2031ed

Sources:

openSUSE 10.2:
ftp://ftp.suse.com/pub/suse/update/10.2/rpm/src/clamav-0.90.2-0.1.src.rpm
2d24ba99281475f4884dd706dea265c9

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/src/clamav-0.90.2-0.2.src.rpm
7bc311314710d124861172e485056ccd

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/clamav-0.90.2-0.1.src.rpm
99ac20be92f82f512d5f4a59feee6460

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/clamav-0.90.2-0.1.src.rpm
7cdb83cd4f29d4963cf4fa563b51d9fc

Our maintenance customers are notified individually. The packages are
offered for installation from the maintenance web:

Open Enterprise Server
http://support.novell.com/techcenter/psdb/50a5cb718f20761dd7e0b6b4e0935c52.html

Novell Linux POS 9
http://support.novell.com/techcenter/psdb/50a5cb718f20761dd7e0b6b4e0935c52.html

SUSE SLES 10
http://support.novell.com/techcenter/psdb/50a5cb718f20761dd7e0b6b4e0935c52.html

SUSE SLES 9
http://support.novell.com/techcenter/psdb/50a5cb718f20761dd7e0b6b4e0935c52.html

______________________________________________________________________________

5) Pending Vulnerabilities, Solutions, and Work-Arounds:

See SUSE Security Summary Report.
______________________________________________________________________________

6) Authenticity Verification and Additional Information

- Announcement authenticity verification:

SUSE security announcements are published via mailing lists and on Web
sites. The authenticity and integrity of a SUSE security announcement is
guaranteed by a cryptographic signature in each announcement. All SUSE
security announcements are published with a valid signature.

To verify the signature of the announcement, save it as text into a file
and run the command

gpg --verify <file>

replacing <file> with the name of the file where you saved the
announcement. The output for a valid signature looks like:

gpg: Signature made <DATE> using RSA key ID 3D25D3D9
gpg: Good signature from "SuSE Security Team <security@suse.de>"

where <DATE> is replaced by the date the document was signed.

If the security team's key is not contained in your key ring, you can
import it from the first installation CD. To import the key, use the
command

gpg --import gpg-pubkey-3d25d3d9-36e12d04.asc

- Package authenticity verification:

SUSE update packages are available on many mirror FTP servers all over the
world. While this service is considered valuable and important to the free
and open source software community, the authenticity and the integrity of
a package needs to be verified to ensure that it has not been tampered
with.

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) Using the internal gpg signatures of the rpm package
2) MD5 checksums as provided in this announcement

1) The internal 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, replacing <file.rpm> with the
filename of the RPM package downloaded. The package is unmodified if it
contains a valid signature from build@suse.de with the key ID 9C800ACA.

This key is automatically imported into the RPM database (on
RPMv4-based distributions) and the gpg key ring of 'root' during
installation. You can also find it on the first installation CD and at
the end of this announcement.

2) If you need an alternative means of verification, use the md5sum
command to verify the authenticity of the packages. Execute the command

md5sum <filename.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
SUSE security announcement. Because the announcement containing the
checksums is cryptographically signed (by security@suse.de), the
checksums show proof of the authenticity of the package if the
signature of the announcement is valid. Note that the md5 sums
published in the SUSE Security Announcements are valid for the
respective packages only. Newer versions of these packages cannot be
verified.

- SUSE runs two security mailing lists to which any interested party may
subscribe:

opensuse-security@opensuse.org
- General Linux and SUSE security discussion.
All SUSE security announcements are sent to this list.
To subscribe, send an e-mail to
<opensuse-security+subscribe@opensuse.org>.

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 e-mail to
<suse-security-announce-subscribe@suse.com>.

=====================================================================
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, the
clear text signature should show proof of the authenticity of the text.

SUSE Linux Products GmbH provides 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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