-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ______________________________________________________________________________ SUSE Security Announcement Package: nfs-server Announcement ID: SUSE-SA:2006:005 Date: Thu, 26 Jan 2006 14:00:00 +0000 Affected Products: SUSE LINUX 10.0 SUSE LINUX 9.3 SUSE LINUX 9.2 SUSE LINUX 9.1 Vulnerability Type: remote code execution Severity (1-10): 7 SUSE Default Package: no Cross-References: CVE-2006-0043 Content of This Advisory: 1) Security Vulnerability Resolved: remote code execution in rpc.mountd of nfs-server 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 An remotely exploitable problem exists in the rpc.mountd service in the user space NFS server package "nfs-server". Insufficient buffer space supplied to the realpath() function when processing mount requests can lead to a buffer overflow in the rpc.mountd and allows remote attackers to execute code as the root user. Code execution is definitely possible if the attacker can create symlinks on any of the file systems on the machine running rpc.mountd (/tmp , /home/attacker or similar). For attackers without filesystem access code execution is potentially possible. NOTE: The "nfs-server" package is obsolete and has been replaced by the "nfs-utils" package (kernel NFS server) in all currently supported SUSE Linux products already and is only included for completeness. The "nfs-utils" package itself is NOT affected by this problem. This issue is tracked by the Mitre CVE ID CVE-2006-0043. 2) Solution or Work-Around If you are still using the old user space nfs-server package, consider switching to the kernel level nfs-utils package which is not affected by this problem. If you are not using NFS serving at all, deinstall the RPM. Otherwise install the updated 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 to apply the update, replacing with the filename of the downloaded RPM package. x86 Platform: SUSE LINUX 10.0: ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/nfs-server-2.2beta51-212.2.i586.rpm 5e37fe16b2c59ecd4f5296ab63710080 SUSE LINUX 9.3: ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/nfs-server-2.2beta51-209.2.i586.rpm 12d423a4df41149131c184ba98cd139f SUSE LINUX 9.2: ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/nfs-server-2.2beta51-208.2.i586.rpm 4df2803717ec4404204f2550c3aa8240 SUSE LINUX 9.1: ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/nfs-server-2.2beta51-206.4.i586.rpm 0e4b9814cfc427d708ed664fcb2d5e83 Power PC Platform: SUSE LINUX 10.0: ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/nfs-server-2.2beta51-212.2.ppc.rpm e64aa29d0b1cdbf8c7801592df9bf199 x86-64 Platform: SUSE LINUX 10.0: ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/nfs-server-2.2beta51-212.2.x86_64.rpm 961bef35240193e56c5f3bf6828611c8 SUSE LINUX 9.3: ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/nfs-server-2.2beta51-209.2.x86_64.rpm 8cacbd583e70f204897f5f4449f4dedd SUSE LINUX 9.2: ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/nfs-server-2.2beta51-208.2.x86_64.rpm 24a0186b5f57fadd1fb7753e416d3d2a SUSE LINUX 9.1: ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/nfs-server-2.2beta51-206.4.x86_64.rpm 33b5dddc7a9e717fa229661efa9592d5 Sources: SUSE LINUX 10.0: ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/nfs-server-2.2beta51-212.2.src.rpm 2fc9d81e214d444cb305f8a485930a48 SUSE LINUX 9.3: ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/nfs-server-2.2beta51-209.2.src.rpm 3d21171dda052e1e744d08ba7dd39742 SUSE LINUX 9.2: ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/nfs-server-2.2beta51-208.2.src.rpm 0f7c7a1eea16a9eb1c444c54805d9ccd SUSE LINUX 9.1: ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/nfs-server-2.2beta51-206.4.src.rpm e88cb3eae24d151197fc2a3e7731fd71 ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/nfs-server-2.2beta51-206.4.src.rpm bceb7a43b4ad42cec21be4da14988d45 ______________________________________________________________________________ 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 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. 2) If you need an alternative means of verification, use the md5sum command to verify the authenticity of the packages. Execute the command md5sum 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-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 . 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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