-----BEGIN PGP SIGNED MESSAGE----- __________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Wu-ftpd Vulnerability September 1, 1999 17:00 GMT Number J-065 ______________________________________________________________________________ PROBLEM: The WU-FTPD Development Group has been informed there is a vulnerability in some versions of wu-ftpd. PLATFORM: All platforms using: wu-ftpd-2.4.2-beta-18-vr4 through wu-ftpd-2.4.2-beta-18-vr15 wu-ftpd-2.4.2-vr16 and wu-ftpd-2.4.2-vr17 wu-ftpd-2.5.0 BeroFTPD, all present versions Other derivatives of wu-ftpd may be effected. DAMAGE: Exploiting this vulnerability may lead to a root compromise. SOLUTION: Upgrade to latest version and apply patch. ______________________________________________________________________________ VULNERABILITY Risk is high. Exploit information involving this vulnerability ASSESSMENT: has been made publicly available. This vulnerability can lead to a root compromise. ______________________________________________________________________________ [ Start WU-FTPD Development Group Advisory ] WU-FTPD Security Update The WU-FTPD Development Group has been informed there is a vulnerability in some versions of wu-ftpd. This vulnerability may allow local & remote users to gain root privileges. Exploit information involving this vulnerability has been made publicly available. The WU-FTPD Development Group recommends sites take the steps outlined below as soon as possible. 1. Description Due to insufficient bounds checking on directory name lengths which can be supplied by users, it is possible to overwrite the static memory space of the wu-ftpd daemon while it is executing under certain configurations. By having the ability to create directories and supplying carefully designed directory names to the wu-ftpd, users may gain privileged access. 2. Impact This vulnerability may allow local & remote users to gain root privileges. 3. Workarounds/Solution Sites may prevent the exploitation of the vulnerability in wu-ftpd by immediately upgrading and applying available patches. 3.1 Affected versions Versions known to be effected are: wu-ftpd-2.4.2-beta-18-vr4 through wu-ftpd-2.4.2-beta-18-vr15 wu-ftpd-2.4.2-vr16 and wu-ftpd-2.4.2-vr17 wu-ftpd-2.5.0 BeroFTPD, all present versions Other derivatives of wu-ftpd may be effected. See the workarrounds (section 3.3) to determine if a derivative is vulnerable. Versions know to be not effected are: NcFTPd, all versions. wu-ftpd-2.4.2 (final, from Academ) All Washington University versions. (Please note: ALL versions of WU-FTPD prior to wu-ftpd-2.4.2-beta-18-vr10 including all WU versions, and all Academ 2.4.1 and 2.4.2 betas, are vulnerable to a remote user root-leveraging attack. See CERT Advisory CA-99-03 'FTP Buffer Overflows' at http://www.cert.org/advisories/CA-99-03-FTP-Buffer-Overflows.html and section 3.2) 3.2 Upgrade to latest wu-ftpd and apply patch The latest version of wu-ftpd from the WU-FTPD Development Group is 2.5.0; sites running earlier versions should upgrade to this version as soon as possible. The WU-FTPD Development Group has a patch available which corrects this vulnerabililty. The patch is available directly from the WU-FTPD Development Group's primary distribution site, and will be propogating to its mirrors shortly. Several other patches to version 2.5.0 are also available. The WU-FTPD Development Group recommends all available patches be applied. Patches for version 2.5.0 are available at the primary distribution site: ftp://ftp.wu-ftpd.org/pub/wu-ftpd/quickfixes/apply_to_2.5.0/ The following patches are available: CRITICAL-SECURITY.PATCH [ End WU-FTPD Development Group Advisory ] ______________________________________________________________________________ CIAC wishes to acknowledge WU-FTPD Development Group for the information contained in this bulletin. ______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@llnl.gov For emergencies and off-hour assistance, DOE, DOE contractor sites, and the NIH may contact CIAC 24-hours a day. During off hours (5PM - 8AM PST), use one of the following methods to contact CIAC: 1. Call the CIAC voice number 925-422-8193 and leave a message, or 2. Call 888-449-8369 to send a Sky Page to the CIAC duty person or 3. Send e-mail to 4498369@skytel.com, or 4. Call 800-201-9288 for the CIAC Project Leader. Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ (or http://ciac.llnl.gov -- they're the same machine) Anonymous FTP: ftp.ciac.org (or ciac.llnl.gov -- they're the same machine) Modem access: +1 (925) 423-4753 (28.8K baud) +1 (925) 423-3331 (28.8K baud) CIAC has several self-subscribing mailing lists for electronic publications: 1. CIAC-BULLETIN for Advisories, highest priority - time critical information and Bulletins, important computer security information; 2. SPI-ANNOUNCE for official news about Security Profile Inspector (SPI) software updates, new features, distribution and availability; 3. SPI-NOTES, for discussion of problems and solutions regarding the use of SPI products. Our mailing lists are managed by a public domain software package called Majordomo, which ignores E-mail header subject lines. To subscribe (add yourself) to one of our mailing lists, send the following request as the E-mail message body, substituting ciac-bulletin, spi-announce OR spi-notes for list-name: E-mail to ciac-listproc@llnl.gov or majordomo@rumpole.llnl.gov: subscribe list-name e.g., subscribe ciac-bulletin You will receive an acknowledgment email immediately with a confirmation that you will need to mail back to the addresses above, as per the instructions in the email. This is a partial protection to make sure you are really the one who asked to be signed up for the list in question. If you include the word 'help' in the body of an email to the above address, it will also send back an information file on how to subscribe/unsubscribe, get past issues of CIAC bulletins via email, etc. PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) J-055: IBM AIX Vulnerability in ptrace() system call J-056: Microsoft "Encapsulated SMTP Address" Vulnerability J-057: Windows NT(r) Terminal Servers DOS Vulnerability J-058: Microsoft "Malformed HTTP Request Header" Vulnerability J-059: IBM AIX (pdnsd) Buffer Overflow Vulnerability J-060: Microsoft Office \221ODBC\222 Vulnerabilities J-061: Lotus Notes Domino Server Denial of Service Attacks J-062: Netscape Enterprise and FastTrack Web Servers Buffer Overflow J-063: Domain Name System (DNS) Denial of Service (DoS) Attacks J-064: ActiveX Controls, Scriptlet.typlib & Eyedog, Vulnerabilities -----BEGIN PGP SIGNATURE----- Version: 4.0 Business Edition iQCVAwUBN86dL7nzJzdsy3QZAQHGJwQAk8/vTi+ZyR+RVK8r9KDim1QMoWxpQB30 0ZTdCxVkkz6rZtEFL8fd3usjGkDted1b1j1CNzXs6AgLitJ0b6XnypLY+kZHg9rj 2axmFui/VPIXPjDDZ28+Dl6vnoIRGvE2y7JYROTwNGB29i3enHP39HlKq1XLrwY2 HHBNTWZiX1c= =Ulm4 -----END PGP SIGNATURE-----