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SuSE: SA:2003:024 Moderate: OpenSSL Remote Key Exploitation

Researchers have discovered certain weaknesses in OpenSSL's RSA decryption algorithm.. ______________________________________________________________________________ SuSE Security Announcement Package: openssl Announcement-ID: SuSE-SA:2003:024 Date: Fri Apr 4 14:00:00 MEST 2003 Affected products: 7.1, 7.2, 7.3, 8.0, 8.1 SuSE Linux Database Server SuSE eMail Server III, 3.1 SuSE Firewall Adminhost VPN SuSE Linux Admin-CD for Firewall SuSE Firewall on CD 2 - VPN SuSE Firewall on CD 2 SuSE Linux Live-CD for Firewall SuSE Linux Connectivity Server SuSE Linux Enterprise Server 7 SuSE Linux Enterprise Server 8 SuSE Linux Office Server UnitedLinux 1.0 Vulnerability Type: remote private-key retrieval Severity (1-10): 5 SuSE default package: Yes Cross References: /index.html Content of this advisory: 1) security vulnerability resolved: Remote timing attack and "Klima-Pokorny-Rosa" attack. problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: - glibc - vnc 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information Researchers from the University of Stanford have discovered certain weaknesses in OpenSSL's RSA decryption algorithm. It allows remote attackers to compute the private RSA key of a serverby observing its timing behavior. This bug has been fixed by enabling "RSA blinding", by default. Additionally an extension of the "Bleichenbacher attack" has been developed by Czech researchers against OpenSSL. This weakness has also been fixed. Please download the update package for your distribution and verify its integrity by the methods listed in section 3) of this announcement. Then, install the package using the command "rpm -Fhv file.rpm" to apply the update. Our maintenance customers are being notified individually. The packages are being offered to install from the maintenance web. i386 Intel Platform: SuSE-8.2: b418a2f73ab572f99f156335f3cd4ef4 d0539c626612c5fcd9b1e81e529dc3af patch rpm(s): 3c8a296170b34838db459a5aefc3e104 patch rpm(s): 8978902dde74da69f72c4ff93a90f1eb source rpm(s): 6dfaa0788bcdcb99939890d4bbd62826 SuSE-8.1: 2ecce759f2806b5ab475877b0ccd1f6f aa79f7f72e503393f8fa9c34290ab497 patch rpm(s): 68e33f6f3f90234a599e7473262e4924 07ee91826db414421ad2a5a1abe27191 source rpm(s): 177ff751ecf0e5e191b36e9df28479ee SuSE-8.0: fabc6f1768cb113555690dbc26b26779 788751185ecf5c3538378de8f583c900 patch rpm(s): dc19ef5b07fcd32d060e8c6c0f11d3e1 0152c98bab2617456b7250431f37c41e source rpm(s): 66080ca41e143339ef95d7dd0c4c19fe SuSE-7.3: 7da5bae86380a034312d69e745bb1bb5 d54d7948b2a5cce732971890f51520a3 source rpm(s): 13749156d3a6fd7597407a65bf2c527b SuSE-7.2: 105d9266ea2117bfa9643eb66441f39b 5d607333a4ddae3cb1e303a8afaf2f43 source rpm(s): 7a06275dda66ea2e9da6c76425439369 SuSE-7.1: 8bb8ea69f878aa08331269bf3f38afa2 dede7c66740ab249de577e5699e8639f source rpm(s): 07bc8370887abba6db3ace2d523eeade Sparc Platform: SuSE-7.3: 1391d007fdb5b99fd71aba949aeb0310 9f0ff708c016fd62d103cadbf3f6892e source rpm(s): fac800ccac7c5f2c3eb544f5a7bf0aea AXP Alpha Platform: SuSE-7.1: c8d02c071cee8f6d70d8a9bb26b010f2 13cdfd1f3b35ee90a7d09240a2a3df40 source rpm(s): e64213b7b488d16de6152d94db9aaa99 PPC Power PC Platform: SuSE-7.3: cb2b6467cbad88c2ac4cecd889b2cb40 c11a579a40184ad6a108bfaa787b2038 source rpm(s): 889ea0f28304224329a37d12390e370b SuSE-7.1: 1694ef2f2018cfcdd4a4bab97d21978b f1b6838c46f3775d4ee6c51714247cb1 source rpm(s): 5a8af3aa4592efba1194518b9a50253e ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - glibc New glibc packages will be available soon which fix a RPC XDR integer overflow. The packages are currently being tested. - vnc VNC (Virtual Network Computing) uses a weak cookie generation process which can be exploited by an attacker to bypass authentication. New packages are currently being tested and will be available on our FTP servers soon. ______________________________________________________________________________ 3) standard appendix: authenticity verification, additional information - Package authenticity verification: SuSE update packages are available on many mirror ftp servers all over the world. While this service is being considered valuable and important to the free and open source software community, many users wish to be sure about the origin of the package and its content before installing the package. 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) md5sums as provided in the(cryptographically signed) announcement. 2) using the internal gpg signatures of the rpm package. 1) 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 announcement. Since the announcement containing the checksums is cryptographically signed (usually using the key 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. We disrecommend to subscribe to security lists which cause the email message containing the announcement to be modified so that the signature does not match after transport through the mailing list software. Downsides: You must be able to verify the authenticity of the announcement in the first place. If RPM packages are being rebuilt and a new version of a package is published on the ftp server, all md5 sums for the files are useless. 2) 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, where is the filename of the rpm package that you have downloaded. Of course, package authenticity verification can only target an un-installed rpm package file. Prerequisites: a) gpg is installed b) The package is signed using a certain key. The public part of this key must be installed by the gpg program in the directory ~/.gnupg/ under the user's home directory who performs the signature verification (usually root). You can import the key that is used by SuSE in rpm packages for SuSE Linux by saving this announcement to a file ("announcement.txt") and running the command (do "su -" to be root): gpg --batch; gpg < announcement.txt | gpg --import SuSE Linux distributions version 7.1 andthereafter install the key " This email address is being protected from spambots. You need JavaScript enabled to view it. " upon installation or upgrade, provided that the package gpg is installed. The file containing the public key is placed at the top-level directory of the first CD (pubring.gpg) and at . - 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/SuSE security discussion. All SuSE security announcements are sent to this list. To subscribe, send an email 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 email to . For general information or the frequently asked questions (faq) send mail to: or respectively. ==================================================================== 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, it is desired that the clear-text signature shows proof of the authenticity of the text. SuSE Linux AG makes 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 pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key . Critical SuSE alert concerning the OpenSSL flaw linked to RSA, emphasizing the risk of remote exploits and required updates for improved security.. SuSE OpenSSL Attack, Remote Key Exploitation, RSA Flaw Resolution. . LinuxSecurity.com Team

Apr 04, 2003 SuSE