SUSE Security Summary Report (SUSE-SR:2006:026)
Posted on: 11/17/2006 04:50 PM

A security announcement from SUSE

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______________________________________________________________________________

SUSE Security Summary Report

Announcement ID: SUSE-SR:2006:026
Date: Fri, 17 Nov 2006 15:00:00 +0000
Cross-References: CVE-2006-5794 CVE-2006-5864 CVE-2006-4339
CVE-2006-5467 CVE-2006-2362 CVE-2006-4809
CVE-2006-4808 CVE-2006-4807 CVE-2006-4806
CVE-2006-5461 CVE-2006-0743

Content of this advisory:
1) Solved Security Vulnerabilities:
- openssh return value checking
- gv stack overflow
- bind DNSSEC RSA signature checking problem
- ruby CGI denial of service problem
- binutils tekhex overflow
- imlib2-loaders denial of service and overflows
- avahi netlink message injection
- log4net syslog format string problem
2) Pending Vulnerabilities, Solutions, and Work-Arounds:
- None listed this week.
3) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Solved Security Vulnerabilities

To avoid flooding mailing lists with SUSE Security Announcements for minor
issues, SUSE Security releases weekly summary reports for the low profile
vulnerability fixes. The SUSE Security Summary Reports do not list md5 sums
or download URLs like the SUSE Security Announcements that are released for
more severe vulnerabilities.

Fixed packages for the following incidents are already available on our FTP
server and via the YaST Online Update.

- openssh return value checking

The OpenSSH release 4.5 contains a security fix which has been
back ported to the openssh versions in our old products.

CVE-2006-5794: Incorrect return argument checking in the privilege
separation monitor was fixed. In case of an exploitable unprivileged
helper this could have been used to elevate privileges.

This is by default not exploitable, it requires another exploitable
problem in the privilege separated processes.

All SUSE Linux based products were affected by this problem.


- gv stack overflow

A stack overflow in the postscript viewer gv could be used to
exploited to execute code, if the user could be tricked into
viewing a prepared postscript file using gv. (CVE-2006-5864)

All SUSE Linux based products were affected.

- bind DNSSEC RSA signature checking problem

The RSA signature problem tracked by the Mitre CVE ID CVE-2006-4339
also affects the DNSSEC implementation in the BIND nameserver.

All SUSE Linux based distributions were affected by this problem.

- ruby CGI denial of service problem

A denial of service problem in the CGI multipart parsing of
"ruby" was fixed, which could have allowed remote attackers
to affect a denial of service attack against ruby based
web services. (CVE-2006-5467)

All SUSE Linux based products containing ruby were affected.

- binutils tekhex overflow

A buffer overflow was fixed in the tekhex handling in "binutils"
which could be used by attackers supplying files to "file" to crash
this program. (CVE-2006-2362)

All SUSE Linux based products were affected, except SLE 10 and 10.1,
which already included the fix at ship time.

- imlib2-loaders denial of service and overflows

Various security problems have been fixed in the imlib2 image
loaders:

CVE-2006-4809: A stack buffer overflow in loader_pnm.c could be used
by attackers to execute code by supplying a handcrafted PNM image.

CVE-2006-4808: A heap buffer overflow in loader_tga.c could
potentially be used by attackers to execute code by supplying a
handcrafted TGA image.

CVE-2006-4807: A out of bounds memory read in loader_tga.c could
be used to crash the imlib2 using application with a handcrafted
TGA image.

CVE-2006-4806: Various integer overflows in width*height calculations
could lead to heap overflows which could potentially be used to
execute code. Affected here are the ARGB, PNG, LBM, JPEG and TIFF
loaders.

Additionally loading of TIFF images on 64bit systems is now possible.

SUSE Linux 9.2 up to 10.1 and SLED 10 were affected by this problem.

Since the only common user of imlib2 is digikam, which usually does
not receive images from the network, chance of exploit-ability is low.

- avahi netlink message injection

Avahi did not check that the received netlink messages originated
from the kernel. This could be used by local attackers to inject
packets into avahi which could be used to inject bad netlink messages
into Avahi, confusing its routing code. (CVE-2006-5461).

SUSE Linux 10.1 and SLED 10 were affected by this problem.


- log4net syslog format string problem

This update fixes a format string exploit in the RemoteSyslogAppender
of the C# log4net.dll. It requires an attacker to be able to inject
prepared text into the logging framework.

The issue is tracked by Mitre CVE ID CVE-2006-0743 and was found
by Sebastian Krahmer of SUSE Security.

Affected was the log4net package in SUSE Linux 10.1 and all C#
applications that include a copy of log4net.dll. The latter were
not updated yet.
______________________________________________________________________________

2) Pending Vulnerabilities, Solutions, and Work-Arounds

None are listed this week.
______________________________________________________________________________

3) 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 containing 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 integrity of a
package needs to be verified to ensure that it has not been tampered with.

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 included at the end of this
announcement.

- 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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