CVE-2009-4445: Input Validation
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2009-4445?
CVE-2009-4445 has a medium severity level due to its potential for file manipulation.
How do I fix CVE-2009-4445?
To fix CVE-2009-4445, ensure that updates for Microsoft Internet Information Services are applied and review third-party upload applications for safe configurations.
What are the implications of CVE-2009-4445?
CVE-2009-4445 allows attackers to create empty files with arbitrary extensions, which can lead to security breaches.
Which versions of IIS are affected by CVE-2009-4445?
CVE-2009-4445 affects Microsoft Internet Information Services versions up to and including 6.0.
Can CVE-2009-4445 be exploited remotely?
Yes, CVE-2009-4445 can be exploited remotely by attackers using special crafted filenames.