Vulnerability Details : CVE-2017-8495
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.
Vulnerability category: BypassGain privilege
Exploit prediction scoring system (EPSS) score for CVE-2017-8495
Probability of exploitation activity in the next 30 days: 0.43%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 71 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2017-8495
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
6.0
|
MEDIUM | AV:N/AC:M/Au:S/C:P/I:P/A:P |
6.8
|
6.4
|
NIST |
|
7.5
|
HIGH | CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.6
|
5.9
|
NIST |
CWE ids for CVE-2017-8495
-
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.Assigned by: nvd@nist.gov (Primary)
References for CVE-2017-8495
-
http://www.securityfocus.com/bid/99424
Microsoft Windows Kerberos CVE-2017-8495 Security Bypass VulnerabilityThird Party Advisory;VDB Entry
-
https://www.orpheus-lyre.info/
Orpheus' LyreThird Party Advisory
-
https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8495
CVE-2017-8495 | Kerberos SNAME Security Feature Bypass VulnerabilityPatch;Vendor Advisory
-
http://www.securitytracker.com/id/1038862
Windows Kerberos SNAME Field Integrity Validation Flaw Lets Remote Authenticated Users Bypass Extended Protection for Authentication - SecurityTrackerThird Party Advisory;VDB Entry
Products affected by CVE-2017-8495
- cpe:2.3:o:microsoft:windows_server_2008:*:sp2:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_7:*:sp1:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_8.1:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_rt_8.1:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_10:1511:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_10:1703:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*