-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SUSE Security Summary Report Announcement-ID: SUSE-SR:2005:006 Date: Fri, 25 Feb 2005 15:00:00 +0000 Cross References: CAN-2005-0100 Content of this advisory: 1) solved security vulnerabilities: - emacs/XEmacs movemail helper problem - wpa_supplicant remote denial of service - FreeNX authentication bug - php4 readfile denial of service 2) pending vulnerabilities, solutions, workarounds: - cyrus-sasl buffer overflow - curl NTLM authentication buffer overflow - IMAP cram-md5 authentication problem - IDN cloaking problems with all browsers - multiple wget problems - new PostgreSQL problems - New kernel security problems 3) standard appendix (further information) ______________________________________________________________________________ 1) solved security vulnerabilities To avoid spamming lists with advisories for every small incident, we will release weekly summary advisories for issues where we have released updates without a full advisory. Since these are minor issues, md5sums and ftp URLs are not included. Fixed packages for the following incidents are already available on our FTP server and via the YaST Online Update. - emacs/XEmacs movemail helper problem Format string bugs were fixed in helper application movemail of both emacs and XEmacs which could be used to execute arbitrary code. This is tracked by the Mitre CVE ID CAN-2005-0100. All SUSE Linux based products are affected. - wpa_supplicant remote denial of service A buffer overflow was identified in the EAPOL-Key frame handling code of wpa_supplicant which can be used to remotely crash wpa_supplicant. SUSE Linux 9.2 is affected by this problem. - FreeNX authentication bug This update of FreeNX fixes the insecure handling of the X authentication. If the XAUTHORITY variable is not set nxagent falsely allows all local users access to the X server. - php4 readfile denial of service A bug in the readfile() function of php4 could be used to to crash the httpd running the php4 code when accessing files with a multiple of the architectures page size leading to a denial of service. This bug affects SUSE Linux 9.0, SUSE Linux 9.1 and SUSE Linux Enterprise Server 9. ______________________________________________________________________________ 2) Pending vulnerabilities in SUSE Distributions and Workarounds: - cyrus-sasl buffer overflow A buffer overflow in the digestmda5 code in cyrus-sasl was found which allows remote attackers to execute arbitrary code (if cyrus-sasl is used). This is tracked by the Mitre ID CAN-2005-0373. All SUSE Linux based products are affected, updated packages are currently in testing. - curl NTLM authentication buffer overflow infamous41md@hotpop.com reported a vulnerability in libcurl, the HTTP/FTP retrieval library. This library is used by lots of programs, including YaST2. The NTLM authorization in curl had a buffer overflow in the base64 decoding which allows a remote attacker using a prepared remote server to execute code for the user using curl. The Kerberos authorization has a similar bug, but is not compiled in on SUSE Linux. This affects all SUSE Linux based distributions, updated packages are currently in testing. - IMAP cram-md5 authentication problem A logical error in the challenge response authentication mechanism CRAM-MD5 was found in the University of Washington IMAP daemon. Due to this mistake a remote attacker can gain access to the IMAP server as arbitrary user. This is tracked by the Mitre CVE ID CAN-2005-0198. All SUSE Linux based distributions are affected, updated packages are currently in testing. - multiple wget problems We are currently working on updated packages for the wget issues as reported on Bugtraq: http://www.securityfocus.com/archive/1/383998 - IDN (Internationalized Domain Name) cloaking / homograph attacks Problems with the IDN / punycode handling that allows non-ASCII domain names were reported for every browser. We are aware of these issues and expect a good solution soon. - new PostgreSQL problems Additional PostgreSQL problems were reported: - A local user could bypass the EXECUTE permission check for functions by using the CREATE AGGREGATE command. CAN-2005-0244 - Multiple buffer overflows were found in PL/PgSQL. CAN-2005-0245, CAN-2005-0247 - A flaw in contrib/intagg CAN-2005-0246 We are working on updates for this problem. - New kernel security problems New kernel security problems in regards to signedness issues have been spotted by Georgi Guninski. We are working on updates for this problems. ______________________________________________________________________________ 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 <name-of-the-file.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 announcement. Since the announcement containing the checksums is cryptographically signed (usually using the key security@suse.de), the checksums show proof of the authenticity of the package. We recommend against subscribing to security lists that cause the e-mail 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 <file.rpm> to verify the signature of the package, where <file.rpm> is the file name of the rpm package that you have downloaded. Of course, package authenticity verification can only target an uninstalled 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 and thereafter install the key "build@suse.de" 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 ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de . - SUSE runs two security mailing lists to which any interested party may subscribe: suse-security@suse.com - general/linux/SUSE security discussion. All SUSE security announcements are sent to this list. To subscribe, send an email to <suse-security-subscribe@suse.com>. 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 email to <suse-security-announce-subscribe@suse.com>. For general information or the frequently asked questions (FAQ) send mail to: <suse-security-info@suse.com> or <suse-security-faq@suse.com> respectively. ===================================================================== SUSE's security contact is <security@suse.com> or <security@suse.de>. @suse.de>. The <security@suse.de> 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. 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