Microsoft Windows
CVE-2018-0886 — CredSSP Remote Code Execution Vulnerability
Executive Summary
A remote code execution vulnerability exists in the Credential Security Support Provider protocol (CredSSP). An attacker who successfully exploited this vulnerability could relay user credentials and use them to execute code on the target system. CredSSP is an authentication provider which processes authentication requests for other applications; any application which depends on CredSSP for authentication may be vulnerable to this type of attack. As an example of how an attacker would exploit this vulnerability against Remote Desktop Protocol, the attacker would need to run a specially crafted application and perform a man-in-the-middle attack against a Remote Desktop Protocol session. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. The security update addresses the vulnerability by correcting how Credential Security Support Provider protocol (CredSSP) validates requests during the authentication process. To be fully protected against this vulnerability users must enable Group Policy settings on their systems and update their Remote Desktop clients. The Group Policy settings are disabled by default to prevent connectivity problems and users must follow the instructions documented HERE to be fully protected.
Overview
7.1
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
Low
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.4
EPSS Score
No EPSS score available for this CVE.
View on FIRST.orgAffected Products
35 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4103716 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 for x64-based Systems | 4103716 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1511 for 32-bit Systems | 4088779 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1511 for x64-based Systems | 4088779 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4103723 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4103723 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1703 for 32-bit Systems | 4103731 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1703 for x64-based Systems | 4103731 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4103727 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4103727 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4103721 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4103721 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4551853 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4551853 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4551853 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1903 for 32-bit Systems | 4556799 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1903 for ARM64-based Systems | 4556799 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4556799 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 4556799 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 4556799 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for x64-based Systems | 4556799 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 4103718 (Monthly Rollup) 4103712 (Security Only) Important Remote Code Execution 4093118 Base: 7.1 Temporal: 6.4 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows 7 for x64-based Systems Service Pack 1 4103718 (Monthly Rollup) 4103712 (Security Only) Important Remote Code Execution 4093118 Base: 7.1 Temporal: 6.4 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows 8.1 for 32-bit systems 4103725 (Monthly Rollup) 4103715 (Security Only) Important Remote Code Execution 4093114 Base: 7.1 Temporal: 6.4 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows 8.1 for x64-based systems 4103725 (Monthly Rollup) 4103715 (Security Only) Important Remote Code Execution 4093114 Base: 7.1 Temporal: 6.4 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows RT 8.1 | 4103725 (Monthly Rollup) |
Important | Remote Code Execution | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 | 4056564 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | 4056564 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2008 for Itanium-Based Systems Service Pack 2 | 4056564 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 | 4056564 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | 4056564 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 4103718 (Monthly Rollup) 4103712 (Security Only) Important Remote Code Execution 4093118 Base: 7.1 Temporal: 6.4 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 4103718 (Monthly Rollup) 4103712 (Security Only) Important Remote Code Execution 4093118 Base: 7.1 Temporal: 6.4 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4103718 (Monthly Rollup) 4103712 (Security Only) Important Remote Code Execution 4093118 Base: 7.1 Temporal: 6.4 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 4103730 (Monthly Rollup) 4103726 (Security Only) Important Remote Code Execution 4093123 Base: 7.1 Temporal: 6.4 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 (Server Core installation) 4103730 (Monthly Rollup) 4103726 (Security Only) Important Remote Code Execution 4093123 Base: 7.1 Temporal: 6.4 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 4103725 (Monthly Rollup) 4103715 (Security Only) Important Remote Code Execution 4093114 Base: 7.1 Temporal: 6.4 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4103725 (Monthly Rollup) 4103715 (Security Only) Important Remote Code Execution 4093114 Base: 7.1 Temporal: 6.4 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2016 | 4103723 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2016 (Server Core installation) | 4103723 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 | 4551853 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 (Server Core installation) | 4551853 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 1709 (Server Core Installation) | 4103727 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4103721 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 1903 (Server Core installation) | 4556799 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 1909 (Server Core installation) | 4556799 (Security Update) |
Important | Remote Code Execution | Yes |
Patches
10 patches
| Article | Type | Restart |
|---|---|---|
4103716 |
Security Update | Yes |
4088779 |
Security Update | Yes |
4103723 |
Security Update | Yes |
4103731 |
Security Update | Yes |
4103727 |
Security Update | Yes |
4103721 |
Security Update | Yes |
4551853 |
Security Update | Yes |
4556799 |
Security Update | Yes |
4103725 |
Monthly Rollup | Yes |
4056564 |
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
Eyal Karni, Yaron Zinar, Roman Blachman @ Preempt, Research Labs
References
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