Microsoft Edge on Win10/Server 2016 Fetch API information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Microsoft Edge on Win10/Server 2016. This affects an unknown part of the component Fetch API. Executing a manipulation can lead to information disclosure. The identification of this vulnerability is CVE-2017-8504. The attack may be launched remotely. There is no exploit available. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in Microsoft Edge on Win10/Server 2016 (Web Browser) (affected version unknown). It has been declared as problematic. This vulnerability affects an unknown functionality of the component Fetch API. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

Microsoft Edge in Windows 10 1607 and 1703, and Windows Server 2016 allows an attacker to read the URL of a cross-origin request when the Microsoft Edge Fetch API incorrectly handles a filtered response type, aka "Microsoft Edge Information Disclosure Vulnerability". This CVE ID is unique from CVE-2017-8498.

The bug was discovered 06/13/2017. The weakness was shared 06/13/2017 by Ariel Zelivansky as KB4022725 as confirmed security update guide (Website). The advisory is shared for download at portal.msrc.microsoft.com. This vulnerability was named CVE-2017-8504 since 05/03/2017. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592. The advisory points out:

An information disclosure vulnerability exists when the Microsoft Edge Fetch API incorrectly handles a filtered response type. An attacker could use the vulnerability to read the URL of a cross-origin request. Websites that that do not securely populate the URL with confidential information could allow information to be disclosed to an attacker.

The vulnerability scanner Nessus provides a plugin with the ID 100760 (KB4022715: Windows 10 Version 1607 and Windows Server 2016 June 2017 Cumulative Update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 91384 (Microsoft Edge Security Update for June 2017).

Applying the patch KB4022725 is able to eliminate this problem. The bugfix is ready for download at catalog.update.microsoft.com. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (100760) and SecurityFocus (BID 98892†). The entries VDB-102376, VDB-102377, VDB-102378 and VDB-102379 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (Microsoft): 4.3
Vendor Vector (Microsoft): 🔍

NVD Base Score: 4.3
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 100760
Nessus Name: KB4022715: Windows 10 Version 1607 and Windows Server 2016 June 2017 Cumulative Update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 802136
OpenVAS Name: Microsoft Windows Multiple Vulnerabilites (KB4022725)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: KB4022725

Timelineinfo

05/03/2017 🔍
06/13/2017 +41 days 🔍
06/13/2017 +0 days 🔍
06/13/2017 +0 days 🔍
06/13/2017 +0 days 🔍
06/13/2017 +0 days 🔍
06/14/2017 +1 days 🔍
06/15/2017 +1 days 🔍
10/18/2019 +855 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: KB4022725
Researcher: Ariel Zelivansky
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-8504 (🔍)
GCVE (CVE): GCVE-0-2017-8504
GCVE (VulDB): GCVE-100-102544

OVAL: 🔍

SecurityFocus: 98892 - Microsoft Edge CVE-2017-8504 Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 06/15/2017 10:20
Updated: 10/18/2019 09:42
Changes: 06/15/2017 10:20 (90), 10/18/2019 09:42 (5)
Complete: 🔍
Cache ID: 216::103

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