CVE-2009-4444

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.

6.0

CVSS

Severity: Medium

CVSS 2.0 •

EPSS 58.58% Top 5%

Third-Party Advisory secunia.com Third-Party Advisory securitytracker.com Third-Party Advisory secproject.com Third-Party Advisory securityfocus.com Third-Party Advisory vupen.com

Affected: n/a n/a

References

Link	Tags
http://www.securityfocus.com/bid/37460	vdb entry third party advisory
http://securitytracker.com/id?1023387	vdb entry third party advisory
http://blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspx	broken link
http://secunia.com/advisories/37831	third party advisory
http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf	third party advisory
http://www.vupen.com/english/advisories/2009/3634	vdb entry third party advisory

Frequently Asked Questions

What is the severity of CVE-2009-4444?: CVE-2009-4444 has been scored as a medium severity vulnerability.
How to fix CVE-2009-4444?: To fix CVE-2009-4444, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2009-4444 being actively exploited in the wild?: It is possible that CVE-2009-4444 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~59% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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