SUSE Security Advisory: clamav remote code execution (SUSE-SA:2005:055)
Posted on: 09/26/2005 06:52 AM

A security announcement from SUSE

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______________________________________________________________________________

SUSE Security Announcement

Package: clamav
Announcement ID: SUSE-SA:2005:055
Date: Mon, 26 Sep 2005 12:00:00 +0000
Affected Products: SUSE LINUX 9.1, 9.2, 9.3, 10.0
SUSE Linux Enterprise Server 9
Vulnerability Type: remote code execution
Severity (1-10): 5
SUSE Default Package: no
Cross-References: CAN-2005-2919
CAN-2005-2920

Content of This Advisory:
1) Security Vulnerability Resolved:
clamav problems in UPX and FSG EXE compressors
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

This update upgrades clamav to version 0.87.

It fixes vulnerabilities in handling of UPX and FSG compressed executables,
which could lead to a remote attacker executing code within the daemon
using clamav.

These are tracked by the Mitre CVE IDs CAN-2005-2919 and CAN-2005-2920.

Also following bugs were fixed:
- Support for PE files, Zip and Cabinet archives has been improved and
other small bugfixes have been made.
- The new option "--on-outdated-execute" allows freshclam to run a command
when system reports a new engine version.

2) Solution or Work-Around

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

3) Special Instructions and Notes

Make sure you restart all daemons linking against the clamav engine directly
after the update.

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 lt;file.rpmgt;

to apply the update, replacing lt;file.rpmgt; with the filename of the
downloaded RPM package.


x86 Platform:

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/clamav-0.87-1.1.i586.rpm
6c55b69bec8ac76df879610e398c57f5

SUSE LINUX 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/clamav-0.87-1.1.i586.rpm
51e99e851de3af05a1e10ce5d21d0f8d

SUSE LINUX 9.1:
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/clamav-0.87-1.2.i586.rpm
243b8a505a83a1fe449961a1b6dfcff3
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/clamav-0.87-1.2.src.rpm
95eeec2ea8731c364b10eb50b1d200b9

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/clamav-0.87-1.1.i586.rpm
45c46b8f2ebb6a097ec253a4f930ee9d

Power PC Platform:

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0-OSS/rpm/ppc/clamav-0.87-1.1.ppc.rpm
2ba2c1b077598f08c24e4b8d5edee68c

x86-64 Platform:

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/clamav-0.87-1.1.x86_64.rpm
db4063e9b447132b6b6fe780d6af54da
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/clamav-0.87-1.1.src.rpm
d46fadec2816d9577979b67a7f66c282

SUSE LINUX 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/clamav-0.87-1.1.x86_64.rpm
60b1f27bad3ef7b857bae850c866b011
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/clamav-0.87-1.1.src.rpm
667c9deb85b25b20dbf01c2b6095791f

SUSE LINUX 9.1:
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/clamav-0.87-1.2.x86_64.rpm
fcfc56602da9cb6f7442ba52561d8701
source rpm(s):
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/clamav-0.87-1.2.src.rpm
a3a648d1657d1a90132af05996c18241

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/clamav-0.87-1.1.x86_64.rpm
a40edb865bcd89b302969b1b7df8ead6
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/clamav-0.87-1.1.src.rpm
e384d8586359dfe548fdc96a4d9f7700

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

http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/3952d0ed7bf90e0e933aa1ba609705c2.html
http://portal.suse.com/psdb/3952d0ed7bf90e0e933aa1ba609705c2.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 lt;filegt;

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

gpg: Signature made lt;DATEgt; using RSA key ID 3D25D3D9
gpg: Good signature from "SuSE Security Team lt;security@suse.degt;"

where lt;DATEgt; 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 lt;file.rpmgt;

to verify the signature of the package, replacing lt;file.rpmgt; 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 lt;filename.rpmgt;

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:

suse-security@suse.com
- General Linux and SUSE security discussion.
All SUSE security announcements are sent to this list.
To subscribe, send an e-mail to
lt;suse-security-subscribe@suse.comgt;.

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
lt;suse-security-announce-subscribe@suse.comgt;.

For general information or the frequently asked questions (FAQ),
send mail to lt;suse-security-info@suse.comgt; or
lt;suse-security-faq@suse.comgt;.

=====================================================================
SUSE's security contact is lt;security@suse.comgt; or lt;security@suse.degt;.
The lt;security@suse.degt; 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 lt;security@suse.degt;
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key lt;build@suse.degt;

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