CVE-2009-4444

View on CVE.org

Published Dec 29, 2009 CVSS 2.0 · 6.0 Medium EPSS 63.6% KEV · Not listed

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

n/a

n/a

affected

Version	Status	Constraints
`n/a`	affected	—

Configuration 1 [-]

OR	cpe:2.3:a:microsoft:internet_information_services:5.0:::::::*
	cpe:2.3:a:microsoft:internet_information_services:6.0:::::::*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

Access Vector Network

Access Complexity Medium

Authentication Single

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

Exploit prediction score: 63.6% (63.627% probability within 30 days)

Key SSVC decision points have not yet been added.

References

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

History

No history.

Subscriptions

Microsoft Internet Information Services

Weaknesses

NVD-CWE-noinfo

Sources

CVE record Updated: Sep 16, 2024, 6:12 PM

Status: PUBLISHED
Assigner: mitre
Published: Dec 29, 2009, 7:00 PM
Updated: Sep 16, 2024, 6:12 PM
Reserved: Dec 29, 2009, 12:00 AM

View source JSON

Vulnrichment No data

No data.

NVD Updated: Jun 16, 2026, 11:13 PM

Status: Modified
Published: Dec 29, 2009, 9:00 PM
Modified: Jun 16, 2026, 11:13 PM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

{"containers": {"cna": {"affected": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"description": "n/a", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2009-12-29T19:00:00.000Z", "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre"}, "references": [{"name": "37460", "tags": ["vdb-entry", "x_refsource_BID"], "url": "http://www.securityfocus.com/bid/37460"}, {"name": "1023387", "tags": ["vdb-entry", "x_refsource_SECTRACK"], "url": "http://securitytracker.com/id?1023387"}, {"tags": ["x_refsource_MISC"], "url": "http://blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspx"}, {"name": "37831", "tags": ["third-party-advisory", "x_refsource_SECUNIA"], "url": "http://secunia.com/advisories/37831"}, {"tags": ["x_refsource_MISC"], "url": "http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf"}, {"name": "ADV-2009-3634", "tags": ["vdb-entry", "x_refsource_VUPEN"], "url": "http://www.vupen.com/english/advisories/2009/3634"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "cve@mitre.org", "ID": "CVE-2009-4444", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "n/a", "version": {"version_data": [{"version_value": "n/a"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "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."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "n/a"}]}]}, "references": {"reference_data": [{"name": "37460", "refsource": "BID", "url": "http://www.securityfocus.com/bid/37460"}, {"name": "1023387", "refsource": "SECTRACK", "url": "http://securitytracker.com/id?1023387"}, {"name": "http://blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspx", "refsource": "MISC", "url": "http://blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspx"}, {"name": "37831", "refsource": "SECUNIA", "url": "http://secunia.com/advisories/37831"}, {"name": "http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf", "refsource": "MISC", "url": "http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf"}, {"name": "ADV-2009-3634", "refsource": "VUPEN", "url": "http://www.vupen.com/english/advisories/2009/3634"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-07T07:01:20.317Z"}, "title": "CVE Program Container", "references": [{"name": "37460", "tags": ["vdb-entry", "x_refsource_BID", "x_transferred"], "url": "http://www.securityfocus.com/bid/37460"}, {"name": "1023387", "tags": ["vdb-entry", "x_refsource_SECTRACK", "x_transferred"], "url": "http://securitytracker.com/id?1023387"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "http://blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspx"}, {"name": "37831", "tags": ["third-party-advisory", "x_refsource_SECUNIA", "x_transferred"], "url": "http://secunia.com/advisories/37831"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf"}, {"name": "ADV-2009-3634", "tags": ["vdb-entry", "x_refsource_VUPEN", "x_transferred"], "url": "http://www.vupen.com/english/advisories/2009/3634"}]}]}, "cveMetadata": {"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "cveId": "CVE-2009-4444", "datePublished": "2009-12-29T19:00:00.000Z", "dateReserved": "2009-12-29T00:00:00.000Z", "dateUpdated": "2024-09-16T18:12:47.226Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:internet_information_services:5.0:*:*:*:*:*:*:*", "matchCriteriaId": "413C07EA-139F-4B7D-A58B-835BD2591FA0", "vulnerable": true}, {"criteria": "cpe:2.3:a:microsoft:internet_information_services:6.0:*:*:*:*:*:*:*", "matchCriteriaId": "9B4DF95D-B4B1-4FB6-9D27-A6D359EEACFA", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Microsoft Internet Information Services (IIS) 5.x y 6.x usa s\u00f3lo la porci\u00f3n de un nombre de fichero antes de un caracter ; (punto y coma) para determinar la extensi\u00f3n del fichero, lo que permite a atacantes remotos eludir las restricciones de extensi\u00f3n previstas para aplicaciones de subida de ficheros de terceros mediante un nombre de fichero con una primera extensi\u00f3n (1) .asp, (2) .cer o (3) .asa seguida de un punto y coma y una extensi\u00f3n segura, tal y como se ha quedado demostrado al usar asp.dll para manejar un fichero .asp;.jpg."}], "id": "CVE-2009-4444", "lastModified": "2026-06-16T23:13:40.793", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "PARTIAL", "baseScore": 6.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:S/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 6.8, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": true, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}]}, "published": "2009-12-29T21:00:24.327", "references": [{"source": "cve@mitre.org", "tags": ["Broken Link"], "url": "http://blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspx"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "http://secunia.com/advisories/37831"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://securitytracker.com/id?1023387"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/37460"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "http://www.vupen.com/english/advisories/2009/3634"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Broken Link"], "url": "http://blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspx"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "http://secunia.com/advisories/37831"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://securitytracker.com/id?1023387"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/37460"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "http://www.vupen.com/english/advisories/2009/3634"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}