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安全漏洞
ArGoSoft Mail Server Pro 1.8.1.7远程拒绝服务漏洞
发布日期:2002-08-05
更新日期:2002-08-08
受影响系统:
ArGoSoft Mail Server Pro 1.8.1.6描述:
ArGoSoft Mail Server Pro 1.8.1.5
ArGoSoft Mail Server Pro 1.8.1.4
ArGoSoft Mail Server Pro 1.8.1.3
ArGoSoft Mail Server Pro 1.8.1.2
ArGoSoft Mail Server Pro 1.8.1.1
ArGoSoft Mail Server Pro 1.8.1.7
- Microsoft Windows NT 4.0
- Microsoft Windows 98
- Microsoft Windows 95
- Microsoft Windows 2000 SP3
BUGTRAQ ID: 5395
CVE(CAN) ID: CVE-2002-1005
ArGoSoft Mail Server Pro是一款支持POP3/SMTP/FINGER的邮件服务程序,可使用在Microsoft windows操作系统下。
ArGoSoft Mail Server Pro在处理转发和自动应答时存在问题,远程攻击者可以利用这个漏洞进行拒绝服务攻击。
ArGoSoft Mail Server Pro系统中用户可以配置他/她的WEB帐户发送邮件给自己,然后再转发给自己,这样的配置下,管理控制台会出现如下现象:
...
8/4/2002 11:22:42 AM - [ 39] Delivering to test
8/4/2002 11:22:42 AM - [ 39] Forwarding mail to test
8/4/2002 11:22:43 AM - [ 40] Delivering to test
8/4/2002 11:22:43 AM - [ 40] Forwarding mail to test
8/4/2002 11:22:44 AM - [ 41] Delivering to test
8/4/2002 11:22:44 AM - [ 41] Forwarding mail to test
8/4/2002 11:22:44 AM - [ 41] Too many Received headers. Mailing loop
suspected
8/4/2002 11:22:45 AM - [ 42] Delivering to test
8/4/2002 11:22:45 AM - [ 42] Forwarding mail to test
8/4/2002 11:22:45 AM - [ 42] Too many Received headers. Mailing loop
suspected
这种情况下,服务程序在尝试20次后就会判断出是信息发生了环路,并进行终止,不会产生拒绝服务,但是,如果用户配置成EMAIL转发给自己,并在WEB设置中配置一个自动应答方式,就会出现如下问题:
/4/2002 11:27:22 AM - [ 47] Delivering to 2 recipients
8/4/2002 11:27:22 AM - [ 47] Forwarding mail to test
8/4/2002 11:27:22 AM - [ 47] Sending auto response...
8/4/2002 11:27:22 AM - [ 47] Autoresponse from test has been relayed
to test
8/4/2002 11:27:22 AM - [ 48] Delivering to test
8/4/2002 11:27:22 AM - [ 47] Forwarding mail to test
8/4/2002 11:27:22 AM - [ 48] Forwarding mail to test
8/4/2002 11:27:22 AM - [ 47] Sending auto response...
8/4/2002 11:27:22 AM - [ 47] Autoresponse not sent, because it has
been recently sent to test
8/4/2002 11:27:22 AM - [ 48] Sending auto response...
8/4/2002 11:27:22 AM - [ 48] Message seems to be autoresponse itself.
Will ignore to avoid loops
...
8/4/2002 11:28:37 AM - [ 133] Message seems to be autoresponse itself.
Will ignore to avoid loops
8/4/2002 11:28:38 AM - [ 134] Delivering to test
8/4/2002 11:28:38 AM - [ 134] Forwarding mail to test
8/4/2002 11:28:38 AM - [ 134] Sending auto response...
8/4/2002 11:28:38 AM - [ 134] Autoresponse from test has been relayed
to test
8/4/2002 11:28:38 AM - [ 135] Delivering to test
8/4/2002 11:28:38 AM - [ 135] Forwarding mail to test
8/4/2002 11:28:38 AM - [ 135] Sending auto response...
<turned off server to avoid problems>
8/4/2002 11:28:39 AM - Web server stopped
8/4/2002 11:28:39 AM - Finger server stopped
8/4/2002 11:28:39 AM - POP3 server stopped
8/4/2002 11:28:39 AM - SMTP server stopped
在上面这种情况下,服务器不能转发信息是否出现环路,导致无限循环,多种这样的邮件发送给服务器处理,可导致服务崩溃,产生拒绝服务。
<*来源:Stan Bubrouski (stan@ccs.neu.edu)
链接:http://marc.theaimsgroup.com/?l=bugtraq&m=102857592309228&w=2
*>
建议:
临时解决方法:
如果您不能立刻安装补丁或者升级,NSFOCUS建议您采取以下措施以降低威胁:
* 禁止不可信用户访问ArGoSoft Mail Server Pro。
厂商补丁:
ArGoSoft
--------
目前厂商还没有提供补丁或者升级程序,我们建议使用此软件的用户随时关注厂商的主页以获取最新版本:
http://www.argosoft.com/applications/mailserver/
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