-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ______________________________________________________________________________ SUSE Security Announcement Package: kernel Announcement ID: SUSE-SA:2009:047 Date: Fri, 02 Oct 2009 10:00:00 +0000 Affected Products: All SUSE Linux and openSUSE products Vulnerability Type: remote denial of service Severity (1-10): 6 SUSE Default Package: yes Cross-References: CVE-2008-4609 FICORA #193744 CERT VU#943657 Content of This Advisory: 1) Security Vulnerability Resolved: TCP/IP denial of service attacks Problem Description 2) Solution or Work-Around 3) Special Instructions and Notes 4) Pending Vulnerabilities, Solutions, and Work-Arounds: Please see SUSE Security Summary Report. 5) Authenticity Verification and Additional Information ______________________________________________________________________________ 1) Problem Description and Brief Discussion Outpost24 AB researchers Robert E. Lee and Jack C. Louis have found TCP/IP denial of service vulnerabilities which allow remote attackers to allocate resources (memory and socket slots) on a targeted system indefinitely and so may cause a denial of the services on the attacked machine. The attack requires the attacker to be able to establish TCP/IP connections on the machine. If all incoming connections are blocked, the system is not affected. The attacks itself are exploiting specific design limitations in the TCP/IP protocol. The upstream Linux kernel developers decided not to release updates at this time, so SUSE also does not plan to release updates to resolve this issue. Refer to the Workarounds section for suggestions on limiting the attack. Further references and information on this issue can be found on the CERT-FI page: https://www.cert.fi/haavoittuvuudet/2008/tcp-vulnerabilities.html And in a generic paper on TCP/IP denial of service attacks: http://www.cpni.gov.uk/Docs/tn-03-09-security-assessment-TCP.pdf SUSE wishes to thank Outpost AB and CERT-FI for reporting these issues. 2) Solution or Work-Around As these attacks look like valid accesses to your internet facing services generally blocking them will not be possible. Options are to by-host limit incoming TCP/IP connections (before they are accepted) or block out sub nets if you see attacks coming from them. With today's botnets this will be difficult as any such blocks could be worked around by attackers. 3) Special Instructions and Notes Denial of service attack patterns these days are mostly flooding using large distributed botnets. Attackers will probably chose these more common methods instead of this more subtle one. ______________________________________________________________________________ 4) Pending Vulnerabilities, Solutions, and Work-Arounds: See SUSE Security Summary Report. ______________________________________________________________________________ 5) 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 " 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. The internal rpm package signatures provide an easy way to verify the authenticity of an RPM package. Use the command rpm -v --checksig to verify the signature of the package, replacing 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. - 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-announce@opensuse.org - SUSE's announce-only mailing list. Only SUSE's security announcements are sent to this list. To subscribe, send an e-mail to . ===================================================================== SUSE's security contact is or . The 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. 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