_____________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | / \ / \___ __|__ /___\ \___ _____________________________________________________ Advisory Notice wuarchive ftpd Trojan Horse April 6, 1994 1640 PST Number E-14 ______________________________________________________________________________ PROBLEM: Some copies of wuarchive FTP daemon (ftpd) source have been modified and contain a Trojan horse. PLATFORM: UNIX machines running wuarchive ftpd version 2.2 or earlier. DAMAGE: Root access may be obtained. SOLUTION: Disable the wuarchive ftpd, then retrieve and install wuarchive ftpd version 2.3 ASSESSMENT OF VULNERABILITY: Intruders have used this Trojan horse to obtain root access to computers on the Internet. ______________________________________________________________________________ Critical Information about wuarchive ftpd Trojan Horse CIAC has received information that some copies of of the wuarchive FTP daemon (ftpd) versions 2.2 and 2.1f have been modified at the source code level to contain a Trojan horse. This Trojan allows any user, local or remote, to become root on the affected UNIX system. CIAC strongly recommends that all sites running these or older versions of the wuarchive ftpd retrieve and install version 2.3. It is possible that versions previous to 2.2 and 2.1f contain the Trojan as well. If the new version cannot be installed in a timely manner, all FTP service should be disabled, since this Trojan affects all systems that are running the wuarchive ftpd, whether or not the system provides anonymous ftp service. Sites can obtain version 2.3 via anonymous FTP from ftp.uu.net, in the file /networking/ftp.wuarchive-ftpd/wu-ftpd-2.3.tar.Z. The BSD Checksum for this file is 24416 181, the SVR4 Checksum for this file is 30488 361, and the MD5 Digital Signature is e58adc5ce0b6eae34f3f2389e9dc9197. ______________________________________________________________________________ For additional information or assistance, please contact CIAC: Voice: 510-422-8193 FAX: 510-423-8002 STU-III: 510-423-2604 E-mail: ciac@llnl.gov Previous CIAC Bulletins and other information are available via anonymous FTP from irbis.llnl.gov (IP address 128.115.19.60). ______________________________________________________________________________ CIAC has two self-subscribing mailing lists for its two types of electronic publications: 1. Advisories (highest priority, time critical information) or Bulletins (important computer security information) and 2. Notes (computer security articles of general interest). Our mailing lists are managed by a public domain software package called ListProcessor, which ignores E-mail header subject lines. To subscribe (add yourself) to one of our mailing lists, send E-mail to: ciac-listproc@llnl.gov with the following request as the E-mail message body, substituting CIAC-BULLETIN or CIAC-NOTES for (service) and valid information for the other items in parentheses: subscribe (service) (Full_Name) (Phone_number) You will receive an acknowledgment containing address, initial PIN, and information on how to change either of them, cancel your subscription, or get help. Currently, to subscribe to both you must send two separate requests. To subscribe an address which is a distribution list, first subscribe the person responsible for your distribution list. You will receive an acknowledgment, containing address and initial PIN. Change the address to the distribution list by sending a second E-mail request. As the body of this message, send the following request, substituting valid information for items in parenthesis: set (service) address (PIN) (distribution_list_address) ______________________________________________________________________________ CIAC wishes to acknowledge and thank the contribution of the CERT Coordination Center for their timely advisory on this vulnerability. ______________________________________________________________________________ PLEASE NOTE: Many users outside of the DOE and ESnet 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 by sending E-mail to first-request@first.org with an empty subject line and a message body containing the line: send first-contacts. 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, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, 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 nor the University of California, and shall not be used for advertising or product endorsement purposes. ______________________________________________________________________________