Vulnerability Name:

CVE-2017-8495 (CCN-127679)

Assigned:2017-07-11
Published:2017-07-11
Updated:2017-07-17
Summary:Microsoft Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allows an attacker to bypass Extended Protection for Authentication when Kerberos fails to prevent tampering with the SNAME field during ticket exchange, aka "Kerberos SNAME Security Feature Bypass Vulnerability" or Orpheus' Lyre.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:6.0 Medium (CVSS v2 Vector: AV:N/AC:M/Au:S/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
7.1 High (CCN CVSS v2 Vector: AV:N/AC:H/Au:S/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-287
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2017-8495

Source: BID
Type: Third Party Advisory, VDB Entry
99424

Source: CCN
Type: BID-99424
Microsoft Windows Kerberos CVE-2017-8495 Security Bypass Vulnerability

Source: SECTRACK
Type: Third Party Advisory, VDB Entry
1038862

Source: XF
Type: UNKNOWN
ms-kerberos-cve20178495-sec-bypass(127679)

Source: CCN
Type: Microsoft Security TechCenter
Security Update Guide - July 2017 Security Updates

Source: CONFIRM
Type: Patch, Vendor Advisory
https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8495

Source: MISC
Type: Third Party Advisory
https://www.orpheus-lyre.info/

Vulnerable Configuration:Configuration 1:
  • cpe:/o:microsoft:windows_10:-:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_10:1511:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_10:1607:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_10:1703:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_7:*:sp1:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_8.1:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_rt_8.1:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_server_2008:*:sp2:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_server_2012:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:microsoft:windows_server_2008:*:sp2:*:*:*:*:x32:*
  • OR cpe:/o:microsoft:windows_server_2008:*:sp2:*:*:*:*:x64:*
  • OR cpe:/o:microsoft:windows_server_2008:*:sp2:*:*:*:*:itanium:*
  • OR cpe:/o:microsoft:windows_7:-:sp1:-:*:-:-:x32:*
  • OR cpe:/o:microsoft:windows_7:*:sp1:*:*:*:*:x64:*
  • OR cpe:/o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
  • OR cpe:/o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:itanium:*
  • OR cpe:/o:microsoft:windows_server_2012:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_8.1:-:-:-:*:-:-:x32:*
  • OR cpe:/o:microsoft:windows_8.1:*:*:*:*:*:*:x64:*
  • OR cpe:/o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_rt_8.1:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_10:-:*:*:*:*:*:x32:*
  • OR cpe:/o:microsoft:windows_10:*:*:*:*:*:*:x64:*
  • OR cpe:/o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    microsoft windows 10 -
    microsoft windows 10 1511
    microsoft windows 10 1607
    microsoft windows 10 1703
    microsoft windows 7 * sp1
    microsoft windows 8.1 *
    microsoft windows rt 8.1 *
    microsoft windows server 2008 * sp2
    microsoft windows server 2008 r2 sp1
    microsoft windows server 2012 *
    microsoft windows server 2012 r2
    microsoft windows server 2016 *
    microsoft windows server 2008 sp2
    microsoft windows server 2008 sp2
    microsoft windows server 2008
    microsoft windows 7 - sp1
    microsoft windows 7 * sp1
    microsoft windows server 2008 r2
    microsoft windows server 2008 r2
    microsoft windows server 2012
    microsoft windows 8.1 - -
    microsoft windows 8.1 *
    microsoft windows server 2012 r2
    microsoft windows rt 8.1 *
    microsoft windows 10 -
    microsoft windows 10 *
    microsoft windows server 2016