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SUSE LINUX 10.0: SUSE-SA:2007:015 Low: AppArmor Language Changes

Two new language features have been added to improve the Two new language features have been added to improve the confinement provided to applications executing other applications will confinement provided to applications executing other applications will confined by AppArmor. - Two new execute modifiers: 'P' and 'U' are provided and are flavorsof the existing 'p' and 'u' modifiers but indicate t [More...]. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ______________________________________________________________________________ SUSE Security Announcement Package: AppArmor Announcement ID: SUSE-SA:2007:015 Date: Thu, 15 Feb 2007 10:00:00 +0000 Affected Products: SUSE LINUX 10.0 SUSE SLES 9 Novell Linux Desktop 9 Open Enterprise Server Novell Linux POS 9 Vulnerability Type: AppArmor language additions Severity (1-10): 2 SUSE Default Package: yes Cross-References: Content of This Advisory: 1) Security Vulnerability Resolved: AppArmor language additions to avoid security related pitfalls 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 Two new language features have been added to improve the confinement provided to applications executing other applications will confined by AppArmor. - Two new execute modifiers: 'P' and 'U' are provided and are flavors of the existing 'p' and 'u' modifiers but indicatethat the environment should be stripped across the execute transition. Using "Ux" and "Px" avoids injecting code using LD_PRELOAD and similar variables into the started executables by a infected profiled program. The environment variable filtering is the same as used for setuid applications. - A new permission 'm' is required when an application executes mmap(2) with protection PROT_EXEC. This avoids infected binaries escalating the "r" privilege to a file into a "rx" privilege. Note that both issues are not directly security fixes, they instead avoid common problems during profile creation. These changes also require a new kernel, which we released in December 2006, tracked by our advisory SUSE-SA:2006:079. Only SUSE Linux Enterprise Server 9 (and related products) and SUSE Linux 10.0 are affected by this change. SUSE Linux 10.1, SUSE Linux Enterprise 10 and newer products already contain the new profile syntax and behavior. 2) Solution or Work-Around There is no known workaround, please install the update packages. 3) Special Instructions and Notes Please verify your profiles still work after installation. Pay close attention to custom developed profiles and locally modified Novell supplied profiles - which may require additional privileges when used on a system supporting these new language features. Please check your existing profiles if "ux" and "px" can be replaced by the safer "Ux" and "Px" inheritance modifiers. In general, try to avoid the unconfined modifiers ("ux" and "Ux") if possible when writing profiles. 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 inSection 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: 936fed12b33b8621caab56733c7b1393 c84f2b888bbe77a934196ba2e04b4ed6 Platform Independent: SUSE LINUX 10.0: b4de70184a97aa091f5856ecb2e3e347 49cabaf9ca52a9fb353d6f4a7a994643 f914bd72cec24ffe5236e9f8d60bc6ca x86-64 Platform: SUSE LINUX 10.0: 8cb73b545b92e0b472214ae3c3e64fa8 165acf23c827c810e2338c71e8cf6449 Sources: SUSE LINUX 10.0: 7e728d2c935286b5633054f2c6fdda65 626b105772b193af7b88531ff903871f 2352ccba90fb77b964cd39d82155033e Our maintenance customers are notified individually. The packages are offered for installation from the maintenance web: Open Enterprise Server Novell Linux POS 9 Novell Linux Desktop 9 SUSE SLES 9 http://support.novell.com/techcenter/psdb/8107eb1c77a60d367936528fd6414aa1.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 replacing with the name of the file where you saved the announcement. The output for a valid signature looks like: gpg: Signature made usingRSA key ID 3D25D3D9 gpg: Good signature from "SuSE Security Team " where 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 This email address is being protected from spambots. You need JavaScript enabled to view it. 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 iscryptographically signed (by This email address is being protected from spambots. You need JavaScript enabled to view it.), 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: This email address is being protected from spambots. You need JavaScript enabled to view it. - General Linux and SUSE security discussion. All SUSE security announcements are sent to this list. To subscribe, send an e-mail to . This email address is being protected from spambots. You need JavaScript enabled to view it. - 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. ==================================================================== . SUSE enhances AppArmor by introducing additional execution modifiers aimed at improving application security and confinement strategies.. AppArmor, Security Update, Execution Modifiers, Application Confinement. . Severity: Low. LinuxSecurity.com Team

Feb 15, 2007 •Low SuSE