5 - MS15-055

Executive Summary

Summary
Title	Vulnerability in Schannel Could Allow Information Disclosure (3061518)

Informations
Name	MS15-055	First vendor Publication	2015-05-12
Vendor	Microsoft	Last vendor Modification	2015-05-12
Severity (Vendor)	Important	Revision	1.0

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:P/I:N/A:N)
Cvss Base Score	5	Attack Range	Network
Cvss Impact Score	2.9	Attack Complexity	Low
Cvss Expoit Score	10	Authentication	None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Severity Rating: Important
Revision Note: V1.0 (May 12, 2015): Bulletin published.
Summary: This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow information disclosure when Secure Channel (Schannel) allows the use of a weak Diffie-Hellman ephemeral (DFE) key length of 512 bits in an encrypted TLS session. Allowing 512-bit DHE keys makes DHE key exchanges weak and vulnerable to various attacks. A server needs to support 512-bit DHE key lengths for an attack to be successful; the minimum allowable DHE key length in default configurations of Windows servers is 1024 bits.

Original Source

Url : https://technet.microsoft.com/en-us/library/security/MS15-055

CWE : Common Weakness Enumeration

%	Id	Name
100 %	CWE-200	Information Exposure

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:28672

Oval ID:	oval:org.mitre.oval:def:28672
Title:	Schannel information disclosure vulnerability - CVE-2015-1716 (MS15-055)
Description:	Schannel in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 does not properly restrict Diffie-Hellman Ephemeral (DHE) key lengths, which makes it easier for remote attackers to defeat cryptographic protection mechanisms via unspecified vectors, aka "Schannel Information Disclosure Vulnerability."
Family:	windows	Class:	vulnerability
Reference(s):	CVE-2015-1716	Version:	3
Platform(s):	Microsoft Windows 7 Microsoft Windows 8 Microsoft Windows 8.1 Microsoft Windows Server 2003 Microsoft Windows Server 2008 Microsoft Windows Server 2012 Microsoft Windows Server 2012 R2 Microsoft Windows Vista Microsoft Windows Server 2008 R2	Product(s):
Definition Synopsis:
Server 2003 and vulnerable file version Server 2003 (x86/x64/ia64) Microsoft Windows Server 2003 (x64) is installed AND Microsoft Windows Server 2003 for Itanium is installed AND Microsoft Windows Server 2003 (32-bit) is installed AND Check if the version of schannel.dll is less than 5.2.3790.5618 OR Vista/2k8 and vulnerable file version Vista/2k8 Microsoft Windows Vista (32-bit) is installed AND Microsoft Windows Vista x64 Edition is installed AND Microsoft Windows Server 2008 (32-bit) is installed AND Microsoft Windows Server 2008 (64-bit) is installed AND Microsoft Windows Server 2008 (ia-64) is installed AND Check for vulnerable versions Check if the version of schannel.dll is less than 6.0.6002.19375 OR Check for LDR Check if the version of Schannel.dll is greater than or equal to 6.0.6002.23000 AND Check if the version of schannel.dll is less than 6.0.6002.23683 OR Win 7 / R2 and vulnerable file version Win 7 / R2 Microsoft Windows 7 (32-bit) is installed AND Microsoft Windows 7 x64 Edition is installed AND Microsoft Windows Server 2008 R2 x64 Edition is installed AND Microsoft Windows Server 2008 R2 Itanium-Based Edition is installed AND Check for vulnerable version Check if the version of schannel.dll is less than 6.1.7601.18843 OR Check for LDR Check if the version of schannel.dll is greater than or equal to 6.1.7601.22000 AND Check if the version of schannel.dll is less than 6.1.7601.23045 OR Win 8 / 2k12 and vulnerable file version Win 8 / 2k12 Microsoft Windows 8 (x86) is installed AND Microsoft Windows 8 (x64) is installed AND Microsoft Windows Server 2012 (64-bit) is installed AND Check for vulnerable versions Check if the version of schannel.dll is less than 6.2.9200.17361 OR Check for LDR Check if the version of Schannel.dll is greater than or equal to 6.2.9200.21000 AND Check if the version of schannel.dll is less than 6.2.9200.21473 OR Win 8.1 / 2k12 R2 and vulnerable file version Win 8.1 / 2k12 R2 Microsoft Windows 8.1 (x86) is installed AND Microsoft Windows 8.1 (x64) is installed AND Microsoft Windows Server 2012 R2 is installed AND Check if the version of schannel.dll is less than 6.3.9600.17810

CPE : Common Platform Enumeration

Type	Description	Count
Os	Microsoft Windows 7 cpe:2.3:o:microsoft:windows_7:-:sp1::::::	1
Os	Microsoft Windows 8 cpe:2.3:o:microsoft:windows_8:-:::::::*	1
Os	Microsoft Windows 8.1 cpe:2.3:o:microsoft:windows_8.1:-:::::::*	1
Os	Microsoft Windows Rt cpe:2.3:o:microsoft:windows_rt:-:::::::*	1
Os	Microsoft Windows Rt 8.1 cpe:2.3:o:microsoft:windows_rt_8.1:-:::::::*	1
Os	Microsoft Windows Server 2003 cpe:2.3:o:microsoft:windows_server_2003:-:sp2::::::	1
Os	Microsoft Windows Server 2008 cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::x64:* cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::itanium:* cpe:2.3:o:microsoft:windows_server_2008:-:sp2::::::	3
Os	Microsoft Windows Server 2012 cpe:2.3:o:microsoft:windows_server_2012:r2:::::::* cpe:2.3:o:microsoft:windows_server_2012:-:::::::*	2
Os	Microsoft Windows Vista cpe:2.3:o:microsoft:windows_vista:-:sp2::::::	1

Information Assurance Vulnerability Management (IAVM)

Date	Description
2015-05-14	IAVM : 2015-A-0111 - Microsoft SChannel Information Disclosure Vulnerability (MS15-055) Severity : Category I - VMSKEY : V0060659

Nessus® Vulnerability Scanner

Date	Description
2015-05-12	Name : The remote Windows host is affected by an information disclosure vulnerability. File : smb_nt_ms15-055.nasl - Type : ACT_GATHER_INFO

Alert History

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Date	Informations
2015-10-18 17:26:34	Multiple Updates
2015-05-14 00:28:50	Multiple Updates
2015-05-13 17:29:43	Multiple Updates
2015-05-13 13:28:09	Multiple Updates
2015-05-12 21:30:31	Multiple Updates
2015-05-12 21:17:20	First insertion

Global Informations

Type	Count
CWE ID(s)	1
Oval ID(s)	1
CPE ID(s)	12
IAVM(s)	1
Nessus® Exploit(s)	1

	Related
10	MS15-067
10	MS15-034
10	MS15-002
9.3	MS15-134
9.3	MS15-131
9.3	MS15-130
9.3	MS15-129
9.3	MS15-128
9.3	MS15-127
9.3	MS15-126
9.3	MS15-125
9.3	MS15-124
9.3	MS15-116
9.3	MS15-115
9.3	MS15-114
9.3	MS15-113
9.3	MS15-112
9.3	MS15-110
9.3	MS15-109
9.3	MS15-108
9.3	MS15-106
9.3	MS15-101
9.3	MS15-100
9.3	MS15-099
9.3	MS15-098
9.3	MS15-097
9.3	MS15-095
9.3	MS15-094
9.3	MS15-093
9.3	MS15-092
9.3	MS15-091
9.3	MS15-090
9.3	MS15-082
9.3	MS15-081
9.3	MS15-080
9.3	MS15-079
9.3	MS15-078
9.3	MS15-070
9.3	MS15-066
9.3	MS15-065
9.3	MS15-060
9.3	MS15-059
9.3	MS15-057
9.3	MS15-056
9.3	MS15-049
9.3	MS15-048
9.3	MS15-046
9.3	MS15-045
9.3	MS15-044
9.3	MS15-043
9.3	MS15-035
9.3	MS15-033
9.3	MS15-032
9.3	MS15-022
9.3	MS15-021
9.3	MS15-020
9.3	MS15-019
9.3	MS15-018
9.3	MS15-012
9.3	MS15-009
9.3	MS15-004
9	MS15-083
8.5	MS15-058
8.3	MS15-011
7.8	MS15-030
7.8	MS15-007
7.2	MS15-135
7.2	MS15-133
7.2	MS15-132
7.2	MS15-119
7.2	MS15-117
7.2	MS15-111
7.2	MS15-102
7.2	MS15-085
7.2	MS15-077
7.2	MS15-076
7.2	MS15-073
7.2	MS15-072
7.2	MS15-068
7.2	MS15-061
7.2	MS15-051
7.2	MS15-038
7.2	MS15-037
7.2	MS15-025
7.2	MS15-023
7.2	MS15-015
7.2	MS15-010
7.2	MS15-003
7.2	MS15-001
6.9	MS15-074
6.9	MS15-069
6.9	MS15-063
6.9	MS15-050
6.9	MS15-017
6.8	MS15-120
6.8	MS15-064
6.1	MS15-005
6	MS15-047
5.8	MS15-121
5.8	MS15-040
5	MS15-107
5	MS15-103
5	MS15-075
5	MS15-026
5	CVE-2015-1716
4.9	MS15-122
4.7	MS15-008
4.6	MS15-052
4.3	MS15-123
4.3	MS15-118
4.3	MS15-104
4.3	MS15-088
4.3	MS15-087
4.3	MS15-086
4.3	MS15-084
4.3	MS15-062
4.3	MS15-053
4.3	MS15-039
4.3	MS15-036
4.3	MS15-031
4.3	MS15-029
4.3	MS15-027
4.3	MS15-024
4.3	MS15-016
4.3	MS15-013
4	MS15-096
3.3	MS15-071
3.3	MS15-014
2.6	MS15-089
2.6	MS15-041
2.1	MS15-042
2.1	MS15-028
1.9	MS15-105
1.9	MS15-054
1.9	MS15-006
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5 - MS15-055

Executive Summary

Security-Database Scoring CVSS v3

Security-Database Scoring CVSS v2

Detail

Original Source

CWE : Common Weakness Enumeration

OVAL Definitions

CPE : Common Platform Enumeration

Information Assurance Vulnerability Management (IAVM)

Nessus® Vulnerability Scanner

Alert History

Global Informations

Open Standards

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