[1][USEMAP:frame_r1_c1.gif] [frame_r1_c3.gif] [2]Japanese SNS Advisory [title2_r1_c1.gif] [3][GoIndex.gif] [4][GoBack.gif] 20 [5][GoNext.gif] [6]Japanese Edition SNS Advisory No.20 Virus Buster 2001 Denial of Service Vulnerability Problem first discovered: 11 Jan 2001 Published: 26 Jan 2001 Last Updated: 26 Jan 2001 _________________________________________________________________ Overview: A vulnerability exists in the feature of virus scan for e-mail in Virus Buster 2001 from Trend Micro Inc. Problem Description: Virus Buster 2001 is a Japanese software package that has similar functions of PC-cillin 2000 such as eMail Virus Scanning and Browser Scanning. The feature of virus scan for e-mail in this software, called "eMail Virus Scanning" on PC-cillin, is used in order not to receive e-mail including virus by scanning every e-mail whenever MUA (Mail User Agent) imports e-mail by using POP3 protocol. The function is running as a proxy between MUA and MRA (Mail Retrieval Agent) as well. The buffer overflow occurs when MUA receives email with the header defined in RFC 822 including unusually long strings. As a result, the user of this software is not able to receive e-mail(s) anymore. A restart of the computer is required in order to gain normal functionality. Example of Issue: From: ichinose@lac.co.jp To: aaaaaaaaaaaaaaaaaaaaa(about 16,000 charactors)aaaaaaaaa Date: Fri, 26 Jan 2001 16:07:23 +0900 Subject: TEST I've seen at all. [20_1.gif] Fig1:Application error Tested Version of Virus Buster: Virus Buster 2001 Program Version 8.00 Tested on: Windows 2000 Professional(Japanese) Status of fixes: This problem does not affect Program Version 8.01. You can update to Program Version 8.01 by using the feature of automatically updating software called intelligent update. If you use a trial version of Virus Buster 2001 installed from supplement to a magazine or CD-ROM, it is strongly recommended to confirm the Program Version and you should purchase the license and update it if it is a vulnerable version. Also, if you have not done user registration and used original one, you must be registered as a customer and update your software with intelligent update(feature to update software automatically). Required conditions for updating are: 1) using product version as registered user. 2) updating the software with Intelligent Update. (License key is necessary to do this.) Vendor Information: Trend Micro Inc.: [7]http://www.trendmicro.com/ Trend Micro Inc.(Japan): [8]http://www.trendmicro.co.jp/ Disclaimer: All information in these advisories are subject to change without any advanced notices neither mutual consensus, and each of them is released as it is. LAC Co.,Ltd. is not responsible for any risks of occurrences caused by applying those information. _________________________________________________________________ Copyright(c) 1995-2002 Little eArth Corporation References 1. LYNXIMGMAP:http://www.lac.co.jp/security/english/snsadv_e/20_e.html#r1_c1Map 2. http://www.lac.co.jp/security/index.html 3. http://www.lac.co.jp/security/english/snsadv_e/index.html 4. http://www.lac.co.jp/security/english/snsadv_e/19_e.html 5. http://www.lac.co.jp/security/english/snsadv_e/21_e.html 6. http://www.lac.co.jp/security/intelligence/SNSAdvisory/20.html 7. http://www.trendmicro.com/ 8. http://www.trendmicro.co.jp/