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SuSE alert SUSE-SA:2006:047 (kernel)

From:  Marcus Meissner <>
Subject:  [suse-security-announce] SUSE Security Announcement: kernel security problems (SUSE-SA:2006:047)
Date:  Fri, 11 Aug 2006 16:24:35 +0200

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ______________________________________________________________________________ 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 SUSE SLES 9 for IBM zSeries 64bit SUSE CORE 9 for IBM S/390 31bit SUSE CORE 9 for Itanium Processor Family SUSE SLES 9 for IBM POWER SUSE CORE 9 for x86 ______________________________________________________________________________ 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 <>" 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 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, 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: - General Linux and SUSE security discussion. All SUSE security announcements are sent to this list. To subscribe, send an e-mail to <>. - SUSE's announce-only mailing list. Only SUSE's security announcements are sent to this list. To subscribe, send an e-mail to <>. For general information or the frequently asked questions (FAQ), send mail to <> or <>. ===================================================================== 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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