Microsoft Windows up to Vista TLS Schannel input validation

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CVSS Meta Temp Score
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4.6$5k-$25k0.00

A vulnerability, which was classified as critical, has been found in Microsoft Windows up to Vista (Operating System). Affected by this issue is an unknown function of the component TLS Schannel. The manipulation with an unknown input leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-20. Impacted is confidentiality, and integrity.

The weakness was shared 11/10/2015 with Microsoft as MS15-121 as confirmed bulletin (Technet). The advisory is shared for download at technet.microsoft.com. This vulnerability is handled as CVE-2015-6112 since 08/14/2015. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 05/03/2019).

The vulnerability scanner Nessus provides a plugin with the ID 86827 (MS15-121: Security Update for Schannel to Address Spoofing (3081320)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins.

Applying the patch MS15-121 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 databases at SecurityFocus (BID 77484), Vulnerability Center (SBV-54327) and Tenable (86827). The entries 79185, 79183 and 79182 are related to this item.

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

VulDB Base Score: 4.8
VulDB Temp Score: 4.6
VulDB Vector: 🔍
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Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-20
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Current Price Estimation: 🔍

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Nessus ID: 86827
Nessus Name: MS15-121: Security Update for Schannel to Address Spoofing (3081320)
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Countermeasuresinfoedit

Recommended: Patch
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Patch: MS15-121

Timelineinfoedit

08/14/2015 🔍
11/10/2015 +88 days 🔍
11/10/2015 +0 days 🔍
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11/11/2015 +1 days 🔍
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11/11/2015 +0 days 🔍
01/11/2017 +427 days 🔍
05/03/2019 +842 days 🔍

Sourcesinfoedit

Vendor: https://www.microsoft.com/
Product: https://www.microsoft.com/en-us/windows

Advisory: MS15-121
Organization: Microsoft
Status: Confirmed

CVE: CVE-2015-6112 (🔍)
SecurityFocus: 77484 - Microsoft Windows SChannel CVE-2015-6112 Man in the Middle Security Bypass Vulnerability
Vulnerability Center: 54327 - [MS15-121] Microsoft Windows Schannel Remote Spoofing Vulnerability, Medium

scip Labs: https://www.scip.ch/en/?labs.20161215
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Entryinfoedit

Created: 11/11/2015 05:08 PM
Updated: 05/03/2019 06:55 AM
Changes: (10) vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai advisory_company_name source_cve_assigned source_securityfocus_date source_securityfocus_class
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