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CVE-2009-4445

6.0 · MEDIUM

Microsoft Internet Information Services (IIS), when used in conjunction with unspecified third-party upload applications, allows remote attackers to create empty files with arbitrary extensions via…

Published Dec 29, 2009microsoftCWE-20EPSS 12.76%

Overview

CVE-2009-4445 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), when used in conjunction with unspecified third-party upload applications, allows remote attackers to create empty files with arbitrary extensions via a filename containing an initial extension followed by a : (colon) and a safe extension, as demonstrated by an upload of a .asp:.jpg file that results in creation of an empty .asp file, related to support for the NTFS Alternate Data Streams (ADS) filename syntax. NOTE: it could be argued that this is a vulnerability in the third-party product, not IIS, because the third-party product should be applying its extension restrictions to the portion of the filename before the colon.

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
microsoftinternet_information_services0Affected

References

Refsecuritytracker.com/id?1023387Refsoroush.secproject.com/downloadable/iis-semicolon-report.pdfRefexchange.xforce.ibmcloud.com/vulnerabilities/55308Refsecuritytracker.com/id?1023387Refsoroush.secproject.com/downloadable/iis-semicolon-report.pdfRefexchange.xforce.ibmcloud.com/vulnerabilities/55308

How CyberStrike helps

Frequently asked questions

What is CVE-2009-4445?

CVE-2009-4445 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-2009-4445?

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-2009-4445?

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-2009-4445?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-4445 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.

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