CVE-2009-4445
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…
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EPSS puts the probability of exploitation in the next 30 days at 12.8%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 2.0
- 6.0 MEDIUMAV:N/AC:M/Au:S/C:P/I:P/A:P
- EPSS
- 12.76% probability · 96th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- microsoft/internet information services
- Source
- cve@mitre.org
References
- http://securitytracker.com/id?1023387Third Party Advisory, VDB Entry
- http://soroush.secproject.com/downloadable/iis-semicolon-report.pdfThird Party Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/55308
- http://securitytracker.com/id?1023387Third Party Advisory, VDB Entry
- http://soroush.secproject.com/downloadable/iis-semicolon-report.pdfThird Party Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/55308
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.