Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2009-4444

6.0 · MEDIUM

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 bypa…

Published Dec 29, 2009microsoftEPSS 63.63%

Overview

CVE-2009-4444 is a medium-severity vulnerability affecting microsoft internet_information_services. It was published on December 29, 2009 and has a CVSS 2.0 base score of 6.0 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 6.0, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories and patches from microsoft. Update internet_information_services to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refblogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspxRefsecunia.com/advisories/37831Refsecuritytracker.com/id?1023387Refsoroush.secproject.com/downloadable/iis-semicolon-report.pdfRefwww.securityfocus.com/bid/37460Refwww.vupen.com/english/advisories/2009/3634Refblogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspxRefsecunia.com/advisories/37831Refsecuritytracker.com/id?1023387Refsoroush.secproject.com/downloadable/iis-semicolon-report.pdf

How CyberStrike helps

Frequently asked questions

What is CVE-2009-4444?

CVE-2009-4444 is a medium-severity vulnerability affecting microsoft internet_information_services. It was published on December 29, 2009 and has a CVSS 2.0 base score of 6.0 (MEDIUM).

How severe is CVE-2009-4444?

This vulnerability has a CVSS 2.0 base score of 6.0, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2009-4444?

Check the references section for vendor advisories and patches from microsoft. Update internet_information_services to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-4444?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-4444 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related MEDIUM CVEs from 2009

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999