Vulnerability CVE-2009-4444


Published: 2009-12-29   Modified: 2012-02-13

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.

Type:

CWE-20

(Improper Input Validation)

Vendor: Microsoft
Product: Internet information server 
Version: 6.0;
Product: IIS 
Version:
6.0
5.1
5.06
5.0

CVSS2 => (AV:N/AC:M/Au:S/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
6/10
6.4/10
6.8/10
Exploit range
Attack complexity
Authentication
Remote
Medium
Single time
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial

 References:
http://blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspx
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

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