CVE-2009-4444

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Summary

CVECVE-2009-4444
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2009-12-29 21:00:24 UTC
Updated2026-04-23 00:35:47 UTC
DescriptionMicrosoft 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.

Risk And Classification

Primary CVSS: v2.0 6 from [email protected]

AV:N/AC:M/Au:S/C:P/I:P/A:P

Problem Types: NVD-CWE-noinfo | n/a

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
Single
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:M/Au:S/C:P/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Microsoft Internet Information Services 5.0 All All All
Application Microsoft Internet Information Services 6.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
soroush.secproject.com/downloadable/iis-semicolon-report.pdf af854a3a-2127-422b-91ae-364da2661108 soroush.secproject.com Third Party Advisory
Webmail : Solution de messagerie professionnelle - OVHcloud- OVH af854a3a-2127-422b-91ae-364da2661108 www.vupen.com Third Party Advisory
Microsoft IIS ASP Multiple Extensions Security Bypass - Secunia Advisories - Vulnerability Information - Secunia.com af854a3a-2127-422b-91ae-364da2661108 secunia.com Third Party Advisory
Microsoft Internet Information Services (IIS) Filename Extension Parsing Configuration Error May Let Users Bypass Security Controls - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 securitytracker.com Third Party Advisory, VDB Entry
RETIRED: Microsoft IIS Malformed Local Filename Security Bypass Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Third Party Advisory, VDB Entry
The Microsoft Security Response Center (MSRC) : New Reports of a Vulnerability in IIS af854a3a-2127-422b-91ae-364da2661108 blogs.technet.com Broken Link
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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