CVE-2009-4444
First published: Tue Dec 29 2009(Updated: )
Microsoft Internet Information Services (IIS) 5.x and 6.x uses only the portion of a filename before a ; (semicolon) character to determine the file extension, which allows remote attackers to bypass intended extension restrictions of third-party upload applications via a filename with a (1) .asp, (2) .cer, or (3) .asa first extension, followed by a semicolon and a safe extension, as demonstrated by the use of asp.dll to handle a .asp;.jpg file.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Internet Information Services (IIS) | =5.0 | |
| Microsoft Internet Information Services (IIS) | =6.0 |
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Reference Links
- http://blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspx
- http://www.securityfocus.com/bid/37460
- http://www.vupen.com/english/advisories/2009/3634
- http://securitytracker.com/id?1023387
- http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf
- http://secunia.com/advisories/37831
Frequently Asked Questions
What is the severity of CVE-2009-4444?
CVE-2009-4444 is classified as a medium-severity vulnerability.
How do I fix CVE-2009-4444?
To mitigate CVE-2009-4444, users should apply security patches provided by Microsoft for IIS versions 5.0 and 6.0.
What does CVE-2009-4444 exploit?
CVE-2009-4444 exploits a flaw in the way IIS processes filenames containing a semicolon, allowing attackers to bypass file extension restrictions.
What software versions are affected by CVE-2009-4444?
CVE-2009-4444 affects Microsoft Internet Information Services (IIS) versions 5.0 and 6.0.
Can CVE-2009-4444 lead to remote code execution?
CVE-2009-4444 does not directly lead to remote code execution but can allow an attacker to upload malicious files.
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