Microsoft Windows up to Vista Schannel code injection

CVSS Meta Temp Score
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CTI Interest Score
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8.7$5k-$25k0.00

Summaryinfo

A vulnerability has been found in Microsoft Windows up to Vista and classified as very critical. Impacted is an unknown function of the component Schannel. The manipulation leads to code injection. This vulnerability is listed as CVE-2014-6321. The attack may be initiated remotely. There is no available exploit. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability was found in Microsoft Windows up to Vista (Operating System). It has been rated as very critical. This issue affects an unknown part of the component Schannel. The manipulation with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability.

The weakness was presented 11/11/2014 with Microsoft as MS14-066 as confirmed bulletin (Technet). It is possible to read the advisory at technet.microsoft.com. The identification of this vulnerability is CVE-2014-6321 since 09/11/2014. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 01/10/2025). The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

We expect the 0-day to have been worth approximately $100k and more. The vulnerability scanner Nessus provides a plugin with the ID 79127 (MS14-066: Vulnerability in Schannel Could Allow Remote Code Execution (2992611)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins. The security flaw can be detected with the following NASL code:

if (
  # Windows 8.1 / Windows Server 2012 R2
  hotfix_is_vulnerable(os:"6.3", sp:0, file:"Schannel.dll", version:"6.3.9600.17385", min_version:"6.3.9600.16000", dir:"\system32", bulletin:bulletin, kb:kb) ||

  # Windows 8 / Windows Server 2012
  hotfix_is_vulnerable(os:"6.2", sp:0, file:"Schannel.dll", version:"6.2.9200.21241", min_version:"6.2.9200.20000", dir:"\system32", bulletin:bulletin, kb:kb) ||
  hotfix_is_vulnerable(os:"6.2", sp:0, file:"Schannel.dll", version:"6.2.9200.17124", min_version:"6.2.9200.16000", dir:"\system32", bulletin:bulletin, kb:kb) ||

  # Windows 7 / Server 2008 R2
  hotfix_is_vulnerable(os:"6.1", sp:1, file:"Schannel.dll", version:"6.1.7601.22814", min_version:"6.1.7601.22000", dir:"\system32", bulletin:bulletin, kb:kb) ||
  hotfix_is_vulnerable(os:"6.1", sp:1, file:"Schannel.dll", version:"6.1.7601.18606", min_version:"6.1.7600.18000", dir:"\system32", bulletin:bulletin, kb:kb) ||

  # Vista / Windows Server 2008
  hotfix_is_vulnerable(os:"6.0", sp:2, file:"Schannel.dll", version:"6.0.6002.23555", min_version:"6.0.6002.23000", dir:"\system32", bulletin:bulletin, kb:kb) ||
  hotfix_is_vulnerable(os:"6.0", sp:2, file:"Schannel.dll", version:"6.0.6002.19247", min_version:"6.0.6002.18000", dir:"\system32", bulletin:bulletin, kb:kb) ||

  # Windows Server 2003
  hotfix_is_vulnerable(os:"5.2", sp:2, file:"Schannel.dll", version:"5.2.3790.5462", dir:"\system32", bulletin:bulletin, kb:kb)
)
The commercial vulnerability scanner Qualys is able to test this issue with plugin 90996 (Microsoft SChannel Remote Code Execution Vulnerability (MS14-066)).

Applying the patch MS14-066 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 16961.

The vulnerability is also documented in the databases at X-Force (98342), Tenable (79127), SecurityFocus (BID 70954†), Secunia (SA59800†) and SecurityTracker (ID 1031186†). See VDB-68184 for similar entry. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

Video

Youtube: Not available anymore

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 8.7

VulDB Base Score: 10.0
VulDB Temp Score: 8.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Code injection
CWE: CWE-94 / CWE-74 / CWE-707
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 79127
Nessus Name: MS14-066: Vulnerability in Schannel Could Allow Remote Code Execution (2992611)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus 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: MS14-066
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

ISS Proventia IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

09/11/2014 🔍
11/11/2014 +61 days 🔍
11/11/2014 +0 days 🔍
11/11/2014 +0 days 🔍
11/11/2014 +0 days 🔍
11/11/2014 +0 days 🔍
11/11/2014 +0 days 🔍
11/12/2014 +1 days 🔍
11/12/2014 +0 days 🔍
01/10/2025 +3712 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: MS14-066
Organization: Microsoft
Status: Confirmed

CVE: CVE-2014-6321 (🔍)
GCVE (CVE): GCVE-0-2014-6321
GCVE (VulDB): GCVE-100-68183

OVAL: 🔍

CERT: 🔍
X-Force: 98342 - Microsoft Secure Channel code execution, High Risk
SecurityFocus: 70954 - Microsoft Secure Channel CVE-2014-6321 Remote Code Execution Vulnerability
Secunia: 59800
SecurityTracker: 1031186 - Windows Schannel Unspecified Flaw Lets Remote Users Execute Arbitrary Code
Vulnerability Center: 46988 - [MS14-066] Microsoft Schannel Security Package Remote Code Execution Vulnerability, Critical

scip Labs: https://www.scip.ch/en/?labs.20140213
See also: 🔍

Entryinfo

Created: 11/12/2014 17:16
Updated: 01/10/2025 15:20
Changes: 11/12/2014 17:16 (81), 08/19/2018 20:04 (9), 02/24/2022 15:11 (3), 02/24/2022 15:17 (1), 12/14/2024 21:33 (16), 01/10/2025 15:20 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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