National Vulnerability Database (NVD) National Vulnerability Database (CVE-2009-4445)

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Last updated: Thu May 23 10:52:27 EDT 2013

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Vulnerability Summary for CVE-2009-4445

Original release date:12/29/2009

Last revised:03/18/2010

Source: US-CERT/NIST

Overview

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.

Impact

CVSS Severity (version 2.0):

CVSS v2 Base Score:6.0 (MEDIUM) (AV:N/AC:M/Au:S/C:P/I:P/A:P) (legend)

Impact Subscore: 6.4

Exploitability Subscore: 6.8

CVSS Version 2 Metrics:

Access Vector: Network exploitable

Access Complexity: Medium

Authentication: Required to exploit

Impact Type:Provides unauthorized access, Allows partial confidentiality, integrity, and availability violation; Allows unauthorized disclosure of information; Allows disruption of service

References to Advisories, Solutions, and Tools

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External Source: XF

Name: ms-iis-colon-security-bypass(55308)

Hyperlink:http://xforce.iss.net/xforce/xfdb/55308

External Source: MISC

Name: http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf

Hyperlink:http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf

External Source: SECTRACK

Name: 1023387

Hyperlink:http://securitytracker.com/id?1023387