Very High
CVE-2022-26809
CVE ID
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Very High
(1 user assessed)
Unknown
(1 user assessed)Unknown
Unknown
Unknown
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Description
Remote Procedure Call Runtime Remote Code Execution Vulnerability. This CVE ID is unique from CVE-2022-24492, CVE-2022-24528.
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Ratings
-
Attacker ValueVery High
Technical Analysis
This vulnerability is one of the three Windows RPC related issues that were fixed in Microsoft’s April 2022 Patch Tuesday. Compared to CVE-2022-24492 and CVE-2022-24528, this one does not require user interaction. It also has the highest CVSS score (9.8) and severity (Critical). Unpatched systems that expose port 445/TCP are potentially vulnerable to Remote Code Execution. This is more likely something that would happen on an internal network, since this port is usually not exposed to the Internet (well, it should not). This bug would be very interesting for any attacker that has gained access to the internal network and needs to move laterally.
According to this article, the issue seems to be an integer overflow bug. Patch diffing reveals that many calls to some kind of sanitizing function have been added. This function checks if an integer value is still in the expected range after some arithmetic operations and should avoid a potentially heap buffer overflow. These checks have been added in multiple locations, both on RPC client-side and server-side of the execution flow.
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Vendors
- Microsoft
Products
- Windows,
- Windows Server,
- Windows 10 Version 1909 for 32-bit Systems,
- Windows 10 Version 1909 for x64-based Systems,
- Windows 10 Version 1909 for ARM64-based Systems,
- Windows 10 Version 21H1 for x64-based Systems,
- Windows 10 Version 21H1 for ARM64-based Systems,
- Windows 10 Version 21H1 for 32-bit Systems,
- Windows Server 2022,
- Windows Server 2022 (Server Core installation),
- Windows 10 Version 20H2 for x64-based Systems,
- Windows 10 Version 20H2 for 32-bit Systems,
- Windows 10 Version 20H2 for ARM64-based Systems,
- Windows Server, version 20H2 (Server Core Installation),
- Windows 11 for x64-based Systems,
- Windows 11 for ARM64-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
References
Additional Info
Technical Analysis
Report as Exploited in the Wild
CVE ID
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