Vulnerability Name:

CVE-2017-11786 (CCN-132579)

Assigned:2017-10-10
Published:2017-10-10
Updated:2019-10-03
Summary:Skype for Business in Microsoft Lync 2013 SP1 and Skype for Business 2016 allows an attacker to steal an authentication hash that can be reused elsewhere, due to how Skype for Business handles authentication requests, aka "Skype for Business Elevation of Privilege Vulnerability."
CVSS v3 Severity:8.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
7.7 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
8.2 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H)
7.1 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): Required
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:9.3 High (CVSS v2 Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
6.8 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-294
Vulnerability Consequences:Gain Privileges
References:Source: MITRE
Type: CNA
CVE-2017-11786

Source: BID
Type: Third Party Advisory, VDB Entry
101156

Source: CCN
Type: BID-101156
Microsoft Skype for Business CVE-2017-11786 Privilege Escalation Vulnerability

Source: SECTRACK
Type: Third Party Advisory, VDB Entry
1039530

Source: XF
Type: UNKNOWN
ms-skype-cve201711786-priv-esc(132579)

Source: CCN
Type: Microsoft Security TechCenter - October 2017
Skype for Business Elevation of Privilege Vulnerability

Source: CONFIRM
Type: Patch, Vendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11786

Vulnerable Configuration:Configuration 1:
  • cpe:/a:microsoft:lync:2013:sp1:*:*:*:*:*:*
  • OR cpe:/a:microsoft:skype_for_business:2016:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:microsoft:lync:2013:sp1:*:*:*:*:x64:*

    • * Denotes that component is vulnerable
    BACK
    microsoft lync 2013 sp1
    microsoft skype for business 2016
    microsoft lync 2013 sp1