Microsoft Windows Web Proxy Autodiscovery Protocol (WPAD) information disclosure
| win-wpad-information-disclosure (33244) |  Medium Risk |
Description:
Microsoft Windows could allow a remote attacker from within the local network to obtain sensitive information, caused by a design error in which the Web Proxy Autodiscovery Protocol (WPAD) is used without static WPAD entries by default. By registering a specially-crafted WPAD entry in DNS or in WINS, an attacker could force the victim to route Internet traffic through a malicious proxy server.
*CVSS:
| Base Score: | 3.5 |
| Access Vector: | Remote |
| Access Complexity: | Low |
| Authentication: | Not Required |
| Confidentiality Impact: | Partial |
| Integrity Impact: | None |
| Availability Impact: | None |
| Temporal Score: | 2.7 |
| Exploitability: | Unproven |
| Remediation Level: | Workaround |
| Report Confidence: | Uncorroborated |
Consequences:
Obtain Information
Remedy:
Refer to Microsoft Knowledge Base Article 934864 for workaround information. See References.
References:
- Microsoft Knowledge Base Article 934864: How to configure Microsoft DNS and WINS to reserve WPAD registration.
- CVE-2007-1692: The default configuration of Microsoft Windows uses the Web Proxy Autodiscovery Protocol (WPAD) without static WPAD entries, which might allow remote attackers to intercept web traffic by registering a proxy server using WINS or DNS, then responding to WPAD requests, as demonstrated using Internet Explorer. NOTE: it could be argued that if an attacker already has control over WINS/DNS, then web traffic could already be intercepted by modifying WINS or DNS records, so this would not cross privilege boundaries and would not be a vulnerability. It has also been reported that DHCP is an alternate attack vector.
- OSVDB ID: 34103: Microsoft Windows Web Proxy Autodiscovery Protocol (WPAD) DNS Subversion
- OSVDB ID: 52520: Microsoft Windows WPAD WINS Server Registration Web Proxy MiTM Weakness
- VUPEN/ADV-2007-1115: Microsoft Windows Web Proxy Automatic Discovery (WPAD) Traffic Routing Vulnerability
Platforms Affected:
- Microsoft Small Business Server 2000
- Microsoft Windows 2000
- Microsoft Windows 2003 Server R2 x64 Datacenter
Reported:
Mar 27, 2007
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.
For corrections or additions please email ignore thisxforceignore this@ignore thisus.ignore thisibm.comignore this
* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.