Vulnerability Name:

CVE-2018-8238 (CCN-145389)

Assigned:2018-07-10
Published:2018-07-10
Updated:2019-10-03
Summary:A security feature bypass vulnerability exists when Skype for Business or Lync do not properly parse UNC path links shared via messages, aka "Skype for Business and Lync Security Feature Bypass Vulnerability." This affects Skype, Microsoft Lync.
CVSS v3 Severity:7.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
6.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/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): Local
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
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): Low
Availibility (A): Low
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
4.3 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
Vulnerability Type:CWE-noinfo
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2018-8238

Source: BID
Type: Third Party Advisory, VDB Entry
104619

Source: CCN
Type: BID-104619
Microsoft Skype for Business and Lync CVE-2018-8238 Security Bypass Vulnerability

Source: XF
Type: UNKNOWN
ms-skype-cve20188238-sec-bypass(145389)

Source: CCN
Type: Microsoft Security TechCenter - July 2018
Skype for Business and Lync Security Feature Bypass Vulnerability

Source: CONFIRM
Type: Patch, Vendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8238

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