Vulnerability in Microsoft Internet Information Services
CVE-2009-4444
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.
Published · last modified .
CVSS v2 metric
CVSS v2 base score 6.0 (Medium). Vector: AV:N/AC:M/Au:S/C:P/I:P/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.
EPSS exploit prediction
EPSS: 0.636 (99.2th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.636 · newest: 0.636 · change: 0.000
Affected products
- Microsoft Internet Information Services — versions 5.0, 6.0
References
- www.securityfocus.com/bid/37460 (VDB Entry, Third Party Advisory, vdb-entry)
- securitytracker.com/id (VDB Entry, Third Party Advisory, vdb-entry)
- blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis… (Broken Link)
- secunia.com/advisories/37831 (Third Party Advisory, third-party-advisory)
- soroush.secproject.com/downloadable/iis-semicolon-report.pdf (Third Party Advisory)
- www.vupen.com/english/advisories/2009/3634 (Third Party Advisory, vdb-entry)