-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 TransSoft's Broker FTP Server 3.x & 4.x Remote DoS attack Vulnerability USSR Advisory Code: USSR-2000054 Public Disclosure Date: October 18, 2000 Vendors Affected: TransSoft's: http://www.transsoft.com/ Systems Affected: Broker FTP Server, all releases prior to 4.3.0.1 are affected Problem: The USSR Team has found a buffer overflow in the Broker FTP Server, which can enable an attacker to execute a denial of service attack against it. If the FTP server is running as a service, an attacker can cause the server to consume _all_ memory and computer resources by inputing a username that is 6000 characters or greater. Note: We take no responsibility for this code. It is for educational purposes only. Example: [pic@peludita]$ telnet example.com 21 Trying example.com... Connected to example.com. Escape character is '^]'. 220 FTP Server ready [***] [buffer] Where [buffer] is aprox. 6000 characters. Date of Vendor Notification: 29-9-2000 Status: Fixed, in versions up to, 4.3.0.1 Fix: http://www.transsoft.com/broker/updates/broker40nt.exe ftp://ftp-broker.com/pub/broker40nt.exe Related Links: Underground Security Systems Research: http://www.ussrback.com CrunchSp Product: http://www.crunchsp.com About: USSR is an emerging security company based in South America devoted to research about network security, vulnerability research, and software protection systems. One of the main objectives of USSR is to develop and implement new security and protection systems based on our knowledge and experience. However, we believe that the way we implement security solutions, can make a difference, CrunchSP is a good example. In our day-to-day research we detect vulnerability issues in different applications that we publish on our advisory board. Most of USSR programmers and partners have more than 12 years of experience in different computer based applications, with great knowledge in high and low level programming languages. For further information on USSR, feel free to contact us by email. USSR has assembled some of the world's greatest software developers and security consultants to help us provide our customers this great range of security services: * Network Penetration Testing * Security Application development * Application Security Testing and Certification * Security Based on Security Tools * Cryptography * Emergency Response Team * Firewalling * Virtual Private Networking * Intrusion Detection * Support and maintenance Copyright (c) 1999-2000 Underground Security Systems Research. Permission is hereby granted for the redistribution of this alert electronically. It is not to be edited in any way without explicit consent of USSR. If you wish to reprint whole or any part of this alert in any other medium excluding electronic medium, please e-mail labs@ussrback.com for permission. Disclaimer: The information within this paper may change without notice. We may not be held responsible for the use and/or potential effects of these programs or advisories. Use them and read them at your own risk or not at all. You solely are responsible for this judgment. Feedback: If you have any questions, comments, concerns, updates, or suggestions please feel free to send them to: Underground Security Systems Research mail:labs@ussrback.com http://www.ussrback.com -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOe4dpNybEYfHhkiVEQICwACgge+J96Gpq+VGCGgiAIiZquNjBFkAoMGW Jhh8gLbFesefKAHIgj98Xgs7 =MSm/ -----END PGP SIGNATURE-----