CVE-2009-1535: microsoft internet_information_services Improper Authentication

Vulnerability summary

CVE-2009-1535 is a high (CVSS 7.5) Improper Authentication vulnerability in microsoft internet_information_services. EPSS estimates a 98.11% chance of exploitation in the next 30 days, higher than 99.9% of scored vulnerabilities. 4 public exploits are recorded.

Timeline

1. 10-06-2009
   PublishedVulnerability first disclosed.
2. 07-08-2024
   Last modifiedVulnerability information updated.

Description

The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection mechanisms, and list folders or read, create, or modify files, via a %c0%af (Unicode / character) at an arbitrary position in the URI, as demonstrated by inserting %c0%af into a "/protected/" initial pathname component to bypass the password protection on the protected\ folder, aka "IIS 5.1 and 6.0 WebDAV Authentication Bypass Vulnerability," a different vulnerability than CVE-2009-1122.

• CWE-287Improper AuthenticationWhen an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.