Remote Access Management service/API (RPC server) Elevation of Privilege Vulnerability

Source data

Overview

Improper authentication in Windows RPC API allows an unauthorized attacker to elevate privileges over an adjacent network.

Impact & technical details

Elevation of Privilege

According to the CVSS metric, the attack vector is adjacent (AV:A). What does that mean for this vulnerability? This vulnerability's attack is limited at the protocol level to a logically adjacent topology. This means it cannot simply be done across the internet, but instead needs something specific tied to the target. Good examples would include the same shared physical network (such as Bluetooth or IEEE 802.11), logical network (local IP subnet), or from within a secure or otherwise limited administrative domain (MPLS, secure VPN to an administrative network zone). This is common to many attacks that require machine-in-the-middle (MITM) type setups or that rely on initially gaining a foothold in another environment.

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do? To trigger this vulnerability, a user must actively connect to the affected server and run a specific command. The vulnerability cannot be triggered automatically or in the background; it only occurs when a user intentionally interacts with the server using this command.

What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

CVSS base score

8.0 / 10

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Highest base score supplied by MSRC for this record; the vector belongs to that score. Ratings can vary by product. Microsoft Important is displayed as High; Moderate is displayed as Medium.

Affected products

• Windows 10 Version 1607 for 32-bit Systems
• Windows 10 Version 1607 for x64-based Systems
• Windows 10 Version 1809 for 32-bit Systems
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 21H2 for 32-bit Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows 10 Version 22H2 for 32-bit Systems

Source guidance

Remediation

The source provides update references without a separate remediation summary. Review the applicable update links below.

At least one Microsoft vendor-fix reference is available. Check each affected product for its applicable update, prerequisites, and supported version.

Authoritative sources & updates

Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.

• Microsoft Security Response Center (opens in a new tab)
• Microsoft security update · 5099538 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5099540 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5099539 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5099536 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5101650 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5099535 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5099445 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5099444 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5101649 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)