CVE-2017-7269
CRITICALCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5Tags
Description
Buffer overflow in the ScStoragePathFromUrl function in the WebDAV service in Internet Information Services (IIS) 6.0 in Microsoft Windows Server 2003 R2 allows remote attackers to execute arbitrary code via a long header beginning with "If: <http://" in a PROPFIND request, as exploited in the wild in July or August 2016.
Analysis
Microsoft IIS 6.0 WebDAV service contains a buffer overflow in the ScStoragePathFromUrl function that allows unauthenticated remote code execution via crafted PROPFIND requests, exploited in the wild since mid-2016.
Technical Context
The CWE-120 buffer overflow in ScStoragePathFromUrl is triggered by an overly long header beginning with 'If: <http://' in a PROPFIND request. The overflow in the WebDAV URL parsing code allows attackers to overwrite the return address and execute shellcode with SYSTEM privileges.
Affected Products
['Microsoft IIS 6.0 on Windows Server 2003 R2']
Remediation
Migrate from Windows Server 2003/IIS 6.0 immediately (end-of-life since 2015). If migration is impossible, disable WebDAV. There is no official patch as the product is unsupported.
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External POC / Exploit Code
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