发布时间 :2001-07-02 00:00:00
修订时间 :2008-09-05 16:23:37

[原文]Microsoft Internet Security and Acceleration (ISA) Server 2000 Web Proxy allows remote attackers to cause a denial of service via a long web request with a specific type.

[CNNVD]Microsoft Internet Security 和 Acceleration (ISA) Server 2000 Web Proxy服务拒绝漏洞(CNNVD-200107-043)

        Microsoft Internet Security 和 Acceleration (ISA) Server 2000 Web Proxy存在漏洞。远程攻击者可以借助具有特定类型的超长web请求导致服务拒绝。

- CVSS (基础分值)

CVSS分值: 7.5 [严重(HIGH)]
机密性影响: PARTIAL [很可能造成信息泄露]
完整性影响: PARTIAL [可能会导致系统文件被修改]
可用性影响: PARTIAL [可能会导致性能下降或中断资源访问]
攻击复杂度: LOW [漏洞利用没有访问限制 ]
攻击向量: [--]
身份认证: NONE [漏洞利用无需身份认证]

- CPE (受影响的平台与产品)


- OVAL (用于检测的技术细节)


- 官方数据库链接
(官方数据源) MITRE
(官方数据源) NVD
(官方数据源) CNNVD

- 其它链接及资源
(VENDOR_ADVISORY)  BUGTRAQ  20010427 Microsoft ISA Server Vulnerability
(VENDOR_ADVISORY)  BUGTRAQ  20010417 [SX-20010320-2b] - Followup re. Microsoft ISA Server Denial of Service
(VENDOR_ADVISORY)  BUGTRAQ  20010416 [SX-20010320-2] - Microsoft ISA Server Denial of Service
(UNKNOWN)  XF  isa-web-proxy-dos(6383)

- 漏洞信息

Microsoft Internet Security 和 Acceleration (ISA) Server 2000 Web Proxy服务拒绝漏洞
高危 未知
2001-07-02 00:00:00 2005-05-02 00:00:00
        Microsoft Internet Security 和 Acceleration (ISA) Server 2000 Web Proxy存在漏洞。远程攻击者可以借助具有特定类型的超长web请求导致服务拒绝。

- 公告与补丁


- 漏洞信息 (20763)

Microsoft ISA Server 2000 Web Proxy DoS Vulnerability (EDBID:20763)
windows dos
2001-04-16 Verified
0 SecureXpert Labs
N/A [点击下载]

It is possible for a user to cause the Web Proxy service on a host running MS ISA Server to stop responding.

If a HTTP request with an unusually long path is submitted, the Web Proxy service could stop responding.

This vulnerability is only exploitable from the internal network unless the Web Publishing service has been enabled, in which case it can be exploited from either internal or external networks. It is disabled by default.

A HTML email containing the malicious URL in an image tag or a javascript URL, could invoke a user's browser. An attempt to fulfill this request by the Web Proxy service, could instigate the denial of service condition on an internal users system. This is a potential way a remote attacker could exploit this vulnerability even if Web Publishing is disabled.

* It has been reported that the execution of arbitrary commands is possible. If this is the case the complete remote compromise of the host may be achievable. The latest findings have not been confirmed by anyone other than the person who posted about it. 

 * repeat.c -- quick-n-dirty hack to output argv[2] instances of the
 * character whose ASCII value is given as argv[1]
 * WARNING - this has absolutely no error checking!

#include <stdio.h>

main (int argc, char **argv) {
  int character;
  long repetitions, i;

  if ( argc != 3 ) {
    printf("usage: repeat char reps\n");
  character = atoi(argv[1]);
  repetitions = atol(argv[2]);

  for (i = 0L; i < repetitions; i++) {
    printf ("%c", character);

- 漏洞信息

Microsoft ISA Server Web Proxy Malformed HTTP Request Parsing Remote DoS
Remote / Network Access Denial of Service
Loss of Availability Patch / RCS
Exploit Public Vendor Verified

- 漏洞描述

- 时间线

2001-04-16 Unknow
Unknow Unknow

- 解决方案

Currently, there are no known workarounds or upgrades to correct this issue. However, Microsoft has released a patch to address this vulnerability.

- 相关参考

- 漏洞作者

Unknown or Incomplete