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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4.7$0-$5k0.36

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 software 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. An attacker might be able to inject arbitrary html and script code into the web site. This would alter the appearance and would make it possible to initiate further attacks against site visitors.

The weakness was disclosed 03/14/2017 as MS17-016 as confirmed bulletin (Technet). The advisory is shared at technet.microsoft.com. 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. It is declared as proof-of-concept. The exploit is shared for download at seclists.org. 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:

http://vulniis/uncpath/%3Cimg%20onerror=alert('xss')%20src=/%3E:/

Applying the patch MS17-016 is able to eliminate this problem. The bugfix is ready for download at technet.microsoft.com. 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 seclists.org.

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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
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.1
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Exploitinginfoedit

Class: Cross site scripting
CWE: CWE-79
ATT&CK: T1059.007

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: David FM
Programming Language: 🔍
Download: 🔍

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Nessus ID: 97741
Nessus Name: MS17-016: Security Update for Windows IIS (4013074)
Nessus File: 🔍
Nessus Family: 🔍

OpenVAS ID: 802074
OpenVAS Name: Microsoft Windows IIS Privilege Escalation Vulnerability (4013074)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfoedit

Interest: 🔍
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Countermeasuresinfoedit

Recommended: Patch
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Patch: MS17-016

Timelineinfoedit

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 🔍

Sourcesinfoedit

Vendor: microsoft.com

Advisory: MS17-016
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-0055 (🔍)
OVAL: 🔍

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

scip Labs: https://www.scip.ch/en/?labs.20161013
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Entryinfoedit

Created: 03/15/2017 01:41 PM
Updated: 04/11/2017 03:32 PM
Changes: (12) vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a advisory_confirm_url source_cve_assigned source_securityfocus_date source_securityfocus_class
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