SUSE Security Announcement: kernel security problems (SUSE-SA:2006:047)
Posted on: 08/11/2006 08:32 AM

A security announcement from SUSE

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______________________________________________________________________________

SUSE Security Announcement

Package: kernel
Announcement ID: SUSE-SA:2006:047
Date: Fri, 11 Aug 2006 17:00:00 +0000
Affected Products: SUSE SLES 9
Open Enterprise Server
Novell Linux Desktop 9
Vulnerability Type: local privilege escalation
Severity (1-10): 7
SUSE Default Package: yes
Cross-References: CVE-2006-0744, CVE-2006-1528, CVE-2006-1857
CVE-2006-1858, CVE-2006-2444, CVE-2006-2448
CVE-2006-2451, CVE-2006-2934, CVE-2006-2935
CVE-2006-3085, CVE-2006-3626

Content of This Advisory:
1) Security Vulnerability Resolved:
various kernel security problems
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 Linux kernel of the SUSE Linux Enterprise 9 products has been
updated to fix the security problems list below.

This update has already been released for the SUSE Linux Retail
products, the Enterprise kernels got delayed due to QA problems.

Since SUSE Linux Enterprise Server 8 is not affected by the local
privilege escalations CVE-2006-3626 and CVE-2006-2451, it is not
included in this update.

- CVE-2006-3626: A race condition allows local users to gain root
privileges by changing the file mode of /proc/self/ files in a way
that causes those files (for instance /proc/self/environ) to become
setuid root.

- CVE-2006-2935: A stack based buffer overflow in CDROM / DVD handling
was fixed which could be used by a physical local attacker to crash
the kernel or execute code within kernel context, depending on presence
of automatic DVD handling in the system
- CVE-2006-2934: When a SCTP packet without any chunks is received,
the newconntrack variable in sctp_packet contains an out of bounds
value that is used to look up an pointer from the array of timeouts,
which is then dereferenced, resulting in a crash. Make sure at least
a single chunk is present.
- CVE-2006-2451: Due to an argument validation error in
prctl(PR_SET_DUMPABLE) a local attacker can easily gain administrator
(root) privileges.
- CVE-2006-3085: Fixed a remotely trigger able endless loop in SCTP
netfilter handling caused by 0 chunk length.
- CVE-2006-2448: Due to missing checking of validity of user space
pointers it was possible for local attackers to read any kernel
memory, potentially exposing sensitive data to the attacker or crash
the kernel. This problem is PowerPC specific.
- CVE-2006-2444: The snmp_trap_decode function in the SNMP
NAT helper allows remote attackers to cause a denial of service
(crash) via unspecified remote attack vectors that cause failures
in snmp_trap_decode that trigger (1) frees of random memory or (2)
frees of previously-freed memory (double-free) by snmp_trap_decode
as well as its calling function, as demonstrated via certain test
cases of the PROTOS SNMP test suite.
- CVE-2006-1858: SCTP allowed remote attackers to cause a denial of
service (crash) and possibly execute arbitrary code via a chunk length
that is inconsistent with the actual length of provided parameters.
- CVE-2006-1857: A buffer overflow in the SCTP protocol could allow
remote attackers to cause a crash or possibly execute arbitrary code
via a malformed HB-ACK chunk
- CVE-2006-1528: Linux allows local users to cause a denial of service
(crash) via a Direct I/O transfer from the sg driver to memory mapped
(mmap) IO space.

Additionally several normal bugs were fixed.

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.

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

SUSE SLES 9 for AMD64 and Intel EM64T
http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/a09c4d297070acc234594c664ed2e674.html

SUSE SLES 9 for IBM zSeries 64bit
http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/97ee46bb758608c23a7a8f3794e95f5b.html

SUSE CORE 9 for IBM S/390 31bit
http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/5a9c5d685ab1b7e99d030c3c0931b0ab.html

SUSE CORE 9 for Itanium Processor Family
http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/d86992c99cab3db27f3af968ef051239.html

SUSE SLES 9 for IBM POWER
http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/d5e125cb83e5f66e18a98737eda9e14c.html

SUSE CORE 9 for x86
http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/c3756e8b0e0ef55dfc3d73fab31b6ec1.html
http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/b9980133c6300cf04c7bfe9fe654442d.html
http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/8620af019b19b415b69db82048727fb6.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:

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
<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 e-mail 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>.

=====================================================================
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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