Vulnerabilities in IIS Allows BASIC and/or NTLM Authentication is a Low risk vulnerability that is one of the most frequently found on networks around the world. This issue has been around since at least 1990 but has proven either difficult to detect, difficult to resolve or prone to being overlooked entirely.
| Vulnerability Name: | IIS Allows BASIC and/or NTLM Authentication |
|---|---|
| Test ID: | 2658 |
| Risk: | Low |
| Category: | Web Servers |
| Type: | Attack |
| Summary: | The remote host appears to be running a version of IIS which allows remote users to determine which authentication schemes are required for confidential webpages. That is, by requesting valid webpages with purposely invalid credentials, you can ascertain whether or not the authentication scheme is in use. This can be used for brute-force attacks against known UserIDs. $OUTPUT |
| Impact: | By requesting valid webpages with purposely invalid credentials, you can ascertain whether or not the authentication scheme is in use. This can be used for brute-force attacks against known UserIDs. |
| Solution: | Follow this procedure: 1. Open Internet Information Service Manager 2. Choose the server 3. Choose master properties 4. Choose WWW Service 5. Choose Edit 6. Choose Directory Security 7. Under Anonymous access, choose edit 8. Deselect Integrated Windows Authentication |
| CVE: | CVE-2002-0419 |
| More Information: | http://www.securityfocus.com/bid/4235 https://exchange.xforce.ibmcloud.com/vulnerabilities/8382 |
| Nist NVD (CVSS): | AV:N/AC:L/Au:N/C:P/I:N/A:N |
| CVSS Score: | 5.0 |
Scanning For and Finding Vulnerabilities in IIS Allows BASIC and/or NTLM Authentication
Use of Vulnerability Management tools are standard practice for the discovery of this vulnerability. The primary failure of VA in finding this vulnerability is related to setting the proper scope and frequency of network scans. It is vital that the broadest range of hosts (active IPs) possible are scanned and that scanning is done frequently. We recommend weekly. Your existing scanning solution or set of test tools should make this not just possible, but easy and affordable.
Penetration Testing for IIS and NTLM Vulnerabilities
The Vulnerabilities in IIS Allows BASIC and/or NTLM Authentication is prone to false positive reports by most vulnerability assessment solutions. Fortra VM uses behavior based testing that eliminates this issue. For all other VA tools security consultants will recommend confirmation by direct observation. In any case Penetration testing procedures for discovery of Vulnerabilities in IIS Allows BASIC and/or NTLM Authentication produces the highest discovery accuracy rate, but the infrequency of this expensive form of testing degrades its value. The ideal would be to have pentesting accuracy and the frequency and scope possibilities of VA solutions.
Security Updates on Vulnerabilities in IIS Allows BASIC and/or NTLM Authentication
Given that this is one of the most frequently found vulnerabilities, there is ample information regarding mitigation online and very good reason to get it fixed. Hackers are also aware that this is a frequently found vulnerability and so its discovery and repair is that much more important. It is so well known and common that any network that has it present and unmitigated indicates "low hanging fruit" to attackers.
Disclosures related to this vulnerability
http://seclists.org/fulldisclosure/2005/Jul/432
Patching/Repairing this Vulnerability
https://technet.microsoft.com/en-us/library/cc754628(v=ws.10).aspx
Vulnerabilities in IIS Allows BASIC and/or NTLM Authentication is a Low risk vulnerability that is also high frequency and high visibility. This is the most severe combination of security factors that exists and it is extremely important to find it on your network and fix it as soon as possible.
Exploits related to Vulnerabilities in IIS Allows BASIC and/or NTLM Authentication
- https://www.cvedetails.com/vulnerability-list/vendor_id-26/product_id-3436/Microsoft-IIS.html
- https://www.cvedetails.com/vulnerability-list/vendor_id-26/product_id-3436/version_id-63587/Microsoft-IIS-5.1.html
- https://www.blackhat.com/presentations/bh-usa-03/bh-us-03-daymont.pdf