CVE-2009-4445

Internet Information Services vulnerability

CVSS

6.0

EPSS

12.8%

EPSS pct

96th

Exploited

No known

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 vendor

Microsoft

Affected product

Internet Information Services

CVSS vector

AV:N/AC:M/Au:S/C:P/I:P/A:P

Weakness type (CWE)

CWE-20 — Improper Input Validation

Published

2009-12-29

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, medium attack complexity, requiring single-factor authentication. Successful exploitation leads to partial impact to confidentiality, partial impact to integrity, partial impact to availability.

Its EPSS score of 12.8% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2009-4445

Confirm whether Microsoft Internet Information Services is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2009-4445.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2009-4445

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2009-4445 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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