Microsoft Windows Server 2003 SP2 up to Server 2012 R2 Schannel cryptographic issues

CVSS Meta Temp Score
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CTI Interest Score
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4.6$0-$5k0.00

A vulnerability was found in Microsoft Windows (Operating System). It has been classified as critical. This affects an unknown function of the component Schannel. The manipulation with an unknown input leads to a cryptographic issues vulnerability. CWE is classifying the issue as CWE-310. This is going to have an impact on confidentiality, and integrity.

The weakness was disclosed 05/12/2015 with Microsoft as MS15-055 as confirmed bulletin (Technet). It is possible to read the advisory at technet.microsoft.com. This vulnerability is uniquely identified as CVE-2015-1716 since 02/17/2015. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1600 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 83360 (MS15-055: Vulnerability in Schannel Could Allow Information Disclosure (3061518)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins. The commercial vulnerability scanner Qualys is able to test this issue with plugin 91052 (Microsoft Schannel Information Disclosure Vulnerability (MS15-055)).

Applying the patch MS15-055 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. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 19886.

The vulnerability is also documented in the databases at Tenable (83360), SecurityFocus (BID 74489†), SecurityTracker (ID 1032283†) and Vulnerability Center (SBV-50066†). Further details are available at krebsonsecurity.com. The entries VDB-75247, VDB-75248, VDB-75249 and VDB-75250 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.6

VulDB Base Score: 4.8
VulDB Temp Score: 4.6
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CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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Exploitinginfo

Class: Cryptographic issues
CWE: CWE-310
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 83360
Nessus Name: MS15-055: Vulnerability in Schannel Could Allow Information Disclosure (3061518)
Nessus File: 🔍
Nessus Risk: 🔍
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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
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Patch: MS15-055
TippingPoint: 🔍

Timelineinfo

02/17/2015 🔍
05/12/2015 +84 days 🔍
05/12/2015 +0 days 🔍
05/12/2015 +0 days 🔍
05/12/2015 +0 days 🔍
05/12/2015 +0 days 🔍
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05/13/2015 +1 days 🔍
05/13/2015 +0 days 🔍
05/13/2015 +0 days 🔍
11/30/2024 +3489 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: MS15-055
Organization: Microsoft
Status: Confirmed

CVE: CVE-2015-1716 (🔍)
OVAL: 🔍

SecurityFocus: 74489 - Microsoft Windows CVE-2015-1716 Information Disclosure Vulnerability
SecurityTracker: 1032283 - Windows Schannel Weak Diffie-Hellman Ephemeral Key Length Lets Remote Users Decrypt TLS Sessions
Vulnerability Center: 50066 - [MS15-055] Microsoft Windows Schannel Remote Information Disclosure Vulnerability, Medium

scip Labs: https://www.scip.ch/en/?labs.20140213
Misc.: 🔍
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Entryinfo

Created: 05/13/2015 12:02 PM
Updated: 11/30/2024 08:58 AM
Changes: 05/13/2015 12:02 PM (72), 08/19/2018 08:13 PM (9), 05/17/2022 08:35 AM (2), 05/17/2022 08:38 AM (1), 11/30/2024 08:58 AM (16)
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Cache ID: 18:42A:40

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