VulnerabilityModified

CVE-2009-4444

MEDIUM 6.0EPSS 63.6%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 63.6%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.

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.

CVSS 2.0: 6.0 MEDIUMAV:N/AC:M/Au:S/C:P/I:P/A:P
EPSS: 63.63% probability · 99th percentile
CISA KEV: Not listed
Affected: microsoft/internet information services
Source: cve@mitre.org

References

http://blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspxBroken Link
http://secunia.com/advisories/37831Third Party Advisory
http://securitytracker.com/id?1023387Third Party Advisory, VDB Entry
http://soroush.secproject.com/downloadable/iis-semicolon-report.pdfThird Party Advisory
http://www.securityfocus.com/bid/37460Third Party Advisory, VDB Entry
http://www.vupen.com/english/advisories/2009/3634Third Party Advisory
http://blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspxBroken Link
http://secunia.com/advisories/37831Third Party Advisory
http://securitytracker.com/id?1023387Third Party Advisory, VDB Entry
http://soroush.secproject.com/downloadable/iis-semicolon-report.pdfThird Party Advisory
http://www.securityfocus.com/bid/37460Third Party Advisory, VDB Entry
http://www.vupen.com/english/advisories/2009/3634Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.