Windows Authentication Methods
CVE-2018-8340 — ADFS Security Feature Bypass Vulnerability
Executive Summary
A security feature bypass vulnerability exists when Active Directory Federation Services (ADFS) improperly handles multi-factor authentication requests. To exploit this vulnerability, an attacker could send a specially crafted authentication request. An attacker who successfully exploited this vulnerability could bypass some, but not all, of the authentication factors. This security update corrects how ADFS handles multi-factor authentication requests.
Overview
6.5
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 5.9
EPSS Score
No EPSS score available for this CVE.
View on FIRST.orgAffected Products
4 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows Server 2012 R2 4343898 (Monthly Rollup) 4343888 (Security Only) Important Security Feature Bypass 4338815 Base: 6.5 Temporal: 5.9 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4343898 (Monthly Rollup) 4343888 (Security Only) Important Security Feature Bypass 4338815 Base: 6.5 Temporal: 5.9 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes None Windows Server 2016 | 4343887 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2016 (Server Core installation) | 4343887 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 1709 (Server Core Installation) | 4343897 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4343909 (Security Update) |
Important | Security Feature Bypass | Yes |
Patches
3 patches
| Article | Type | Restart |
|---|---|---|
4343887 |
Security Update | Yes |
4343897 |
Security Update | Yes |
4343909 |
Security Update | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Andrew Lee at OKTA REX Team
References
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