Microsoft IIS 7.0/7.5/8.0/8.5/10 /uncpath/ cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in Microsoft IIS 7.0/7.5/8.0/8.5/10 (Web Server). It has been classified as problematic. This affects some unknown processing of the file /uncpath/. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity.

The weakness was disclosed 03/14/2017 as MS17-016 as confirmed bulletin (Technet). The advisory is shared at This vulnerability is uniquely identified as CVE-2017-0055 since 09/09/2016. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details and a public exploit are known. MITRE ATT&CK project uses the attack technique T1059.007 for this issue. The advisory points out:

The vulnerability could allow elevation of privilege if a user clicks a specially crafted URL which is hosted by an affected Microsoft IIS server. An attacker who successfully exploited this vulnerability could potentially execute scripts in the user’s browser to obtain information from web sessions.

A public exploit has been developed by David FM in URL/Javascript and been published 2 days after the advisory. The exploit is shared for download at It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 97741 (MS17-016: Security Update for Windows IIS (4013074)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins. The code used by the exploit is:


Applying the patch MS17-016 is able to eliminate this problem. The bugfix is ready for download at A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (97741). Further details are available at The entries VDB-89568, VDB-89592, VDB-89597 and VDB-89653 are pretty similar.







CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.0

VulDB Base Score: 4.3
VulDB Temp Score: 3.9
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NVD Base Score: 6.1
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Class: Cross site scripting
CWE: CWE-79 / CWE-74 / CWE-707

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: David FM
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Nessus ID: 97741
Nessus Name: MS17-016: Security Update for Windows IIS (4013074)
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OpenVAS ID: 802074
OpenVAS Name: Microsoft Windows IIS Privilege Escalation Vulnerability (4013074)
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Threat Intelligenceinfo

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Recommended: Patch
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Patch: MS17-016


09/09/2016 🔍
03/14/2017 +186 days 🔍
03/14/2017 +0 days 🔍
03/14/2017 +0 days 🔍
03/15/2017 +1 days 🔍
03/16/2017 +1 days 🔍
03/16/2017 +0 days 🔍
04/11/2017 +26 days 🔍



Advisory: MS17-016
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-0055 (🔍)

SecurityFocus: 96622 - Microsoft Windows CVE-2017-0055 Cross Site Scripting Vulnerability

scip Labs:
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Created: 03/15/2017 01:41 PM
Updated: 04/11/2017 03:32 PM
Changes: 03/15/2017 01:41 PM (75), 04/11/2017 03:32 PM (12)
Complete: 🔍
Cache ID: 100:170:40


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