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Last updated: 9/3/2014 1:06:18 AM

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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: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service

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External Source: XF
Name: ms-iis-colon-security-bypass(55308)
External Source: MISC
Name: http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf
External Source: SECTRACK
Name: 1023387

Technical Details

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