Microsoft IIS 4.0 discloses internal IP addresses
| iis-internal-ip-disclosure (5106) |  Low Risk |
Description:
Microsoft Internet Information Server (IIS) could allow a remote attacker to obtain the internal IP address of the server. A remote attacker can use a HTTP 1.0 request to a Web page protected by basic authentication with no realm defined to obtain the internal IP address of the Web server and possibly locate other hosts.
Platforms Affected:
- Microsoft, IIS 4.0
Remedy:
Use the adsutil utility to modify the UseHostName value in the IIS metabase and change the default behavior from exposing IP addresses to sending the Fully Qualified Domain Name (FDQN) instead. Detailed instructions on using the adsutil utility are available in Microsoft Knowledge Base Article 218180. See References.
As a workaround, set a realm string for the root level of the server and set separate realms for subdirs as needed.
Consequences:
Obtain Information
References:
- Microsoft Knowledge Base Article 218180, Internet Information Server Returns IP Address in HTTP Header (Content-Location) at http://support.microsoft.com/default.aspx?scid=kb;[LN];218180.
- NTBugTraq Mailing List, Thu, 13 Jul 2000 11:34:25, IIS4 Basic authentication realm issue at http://www.ntbugtraq.com/default.asp?pid=36&sid=1&A2=ind0007&L=ntbugtraq&F=&S=&P=3297.
- BID-1499: Microsoft IIS Internal IP Address Disclosure Vulnerability
- CVE-2000-0649: IIS 4.0 allows remote attackers to obtain the internal IP address of the server via an HTTP 1.0 request for a web page which is protected by basic authentication and has no realm defined.
Reported:
Jul 13, 2000
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