______________________________________________________________________________ SuSE Security Announcement Package: wuftpd Announcement-ID: SuSE-SA:2001:043 Date: Wednesday, Nov. 28th, 2001 23:45 MET Affected SuSE versions: 6.3, 6.4, 7.0, 7.1, 7.2, 7.3 Vulnerability Type: remote root compromise Severity (1-10): 7 SuSE default package: no Other affected systems: all liunx-like systems using wu-ftpd 2.4.x / 2.6.0 / 2.6.1 Content of this advisory: 1) security vulnerability resolved: wuftpd problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information The wuftpd package as shipped with SuSE Linux distributions comes with two versions of wuftpd: wuftpd-2.4.2, installed as /usr/sbin/wuftpd, and wuftpd-2.6.0, installed as /usr/sbin/wuftpd-2.6. The admin decides which version to use by the inetd/xinetd configuration. The CORE ST Team had found an exploitable bug in all versions of wuftpd's ftpglob() function. The glob function overwrites buffer bounds while matching open and closed brackets. Due to a missing \0 at the end of the buffer a later call to a function that frees allocated memory will feed free(3) with userdefined data. This bug could be exploited depending on the implementation of the dynmaic allocateable memory API (malloc(3), free(3)) in the libc library. Linux and other system are exploitable! Some weeks ago, an internal source code audit of wu-ftpd 2.6.0 performed by Thomas Biege, SuSE Security, revealed some other security related bugs that are fixed in the new RPM packages. Additionally, code from wu-ftpd 2.6.1 were backported to version 2.6.0 to make it more stable. A temporary fix other than using a different server implementation of the ftp protocol is not available. We recommend to update the wuftpd package on your system. We thank the wuftpd team for their work on the bug, particularly because the coordination between the vendors and the wuftpd developers lacked the necessary discipline for the timely release of the information about the problem. 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 -Uhv file.rpm" to apply the update. i386 Intel Platform: SuSE-7.3 d1b549b8c2d91d66a8b35fe17a1943b3 source rpm: 9ef0e6ac850499dc0150939c62bc146f SuSE-7.2 4583443a993107b26529331fb1e6254d source rpm: aaee0343670feae70ccc9217a8e22211 SuSE-7.1 347a030a85cb5fcbe32d3d79d382e19e source rpm: aa3e53641f6ce0263196e6f1cb0447c3 SuSE-7.0 e34eec18ecc10f187f6aa1aa3b24b75b source rpm: fafc8c2bbd68dd5ca3d04228433c359a SuSE-6.4 2354abe95b056762c7f6584449291ff2 source rpm: 507b8d484b13737c9d2b6a68fda0cc26 SuSE-6.3 9851ad02e656bba8b5e02ed2ddb46845 source rpm: 5d7c4b6824836ca28b228cc5dcfc4fd6 Sparc Platform: SuSE-7.3 2d19e4ead17396a1e28fca8745f9629d source rpm: bdb0b5ddd72f8563db3c8e444a0df7f5 SuSE-7.1 f6b04f284bece6bf3700facccc015ffe source rpm: 1660547ac9a5a3b32a4070d69803cf18 SuSE-7.0 1bd905b095b9a4bb354fc190b6e54a01 source rpm: 597263eb7d0fbbf242d519d3c126a441 AXP Alpha Platform: SuSE-7.1 e608bfd2cc9e511c6eb6932c33c68789 source rpm: 34915af1ca79b27bad8bc2fd3a5cab05 SuSE-7.0 86a7d8f60d76a053873bcc13860b0bbb source rpm: 9674f9f1630b3107ac22d275705da76e SuSE-6.4 2501444a1e4241e8f6f4cdcc6fd133b0 source rpm: 34812d943900bdb902ad7edd40e1943f SuSE-6.3 429a49ef9d4d0865fbb443c212b8a8c7 source rpm: 76467dae0f460677ba80ec907eefca28 PPC Power PC Platform: SuSE-7.3 a381269b3e2fc43fda59e4d08aef57ae source rpm: 7cacb696a88e57a843402a796212aee6 SuSE-7.1 bfc39be2c09323d96f974fdd0c73fda1 source rpm: e2681b2ed4801ce14b5dfb926480ac51 SuSE-7.0 19f989e637fd9b6fa652f8a4014bb7b1 source rpm: 76c493a915691c51a2481f0925e8ce39 SuSE-6.4 ad29cf172bbd03a5e1f301cf6b9404e5 source rpm: 82338702692eba599d8c3d242aff3d1a ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - ssh/openssh exploits The wrong fix for the crc32-compensation attack is currently actively exploited in the internet for both the ssh and the openssh implementation of the ssh-1 protocol. We urge our users to upgrade their ssh or openssh packages to the latest versions that are located on our ftp server at the usual directories, referred to via SUSE – Open-Source-Lösungen für Enterprise Server und Cloud | SUSE from February earlier this year. Please note, the packages for the SuSE Linux distributions 7.0 and older containing cryptographic code are located on the German ftp server ftp.suse.de, the distributions 7.1 and newer have their crypto updates on ftp.suse.com. There are legal constraints beyond our control that lead to this situation. Openssh packages of the version 2.9.9p2 ready to download on the ftp server ftp.suse.com. They fix the security problems mentioned above, along with a set of less serious security problems. The announcement is still pending while investigations about the status of the package are in progress. - libgtop_daemon The libgtop_daemon, part of the libgtop package for gathering and monitoring process and system information, has been found vulnerable to a format string error. We are in the process of providing fixes for the affected distributions 6.4-7.3. In the meanwhile, we recommend to disable the libgtop_daemon on systems where it is running. This daemon is neither installed nor started (if installed) by default on SuSE Systems. - kernel updates A bug in the elf loader of the linux kernels version 2.4 from our announcement SSA:2001:036 can cause a system to crash if a user executes a vmlinux kernel image. We are preparing another update series to workaround this problem and will re-issue the kernel announcement as soon as possible. ______________________________________________________________________________ 3) standard appendix: SuSE runs two security mailing lists to which any interested party may subscribe: email@example.com - general/linux/SuSE security discussion. All SuSE security announcements are sent to this list. To subscribe, send an email to <firstname.lastname@example.org>. email@example.com - SuSE's announce-only mailing list. Only SuSE's security annoucements are sent to this list. To subscribe, send an email to <firstname.lastname@example.org>. For general information or the frequently asked questions (faq) send mail to: <email@example.com> or <firstname.lastname@example.org> respectively. ============================================== SuSE's security contact is <email@example.com>. ============================================== ______________________________________________________________________________ The information in this advisory may be distributed or reproduced, provided that the advisory is not modified in any way. SuSE GmbH makes no warranties of any kind whatsoever with respect to the information contained in this security advisory.