CVE-2025-24058
dwmcore.dll -- improper input validation allows elevation of privilege
Summary
| Field | Value |
|---|---|
| Driver | dwmcore.dll (Desktop Window Manager Core Library) |
| Vulnerability Class | Improper Input Validation |
| CVSS | 7.8 |
| Exploited ITW | No |
| Patch Date | June 10, 2025 |
Root Cause
The Desktop Window Manager (DWM) is the compositor responsible for rendering every visible window on modern Windows. It runs as a SYSTEM-level process, which means any code execution within DWM immediately yields the highest local privilege level. This architectural decision makes DWM bugs inherently high-impact.
CVE-2025-24058 is an input validation failure in dwmcore.dll during composition operations. When the DWM process receives composition data (surface descriptions, blend parameters, or geometry inputs), it skips validation on certain fields before using them in memory operations. Malformed input triggers a corruption path that allows an attacker to write controlled data to unintended locations within the DWM process's address space.
Because DWM runs as SYSTEM, there is no separate privilege escalation step needed after achieving code execution. The corruption itself, if it lands in the right place, directly yields SYSTEM privileges.
Exploitation
An attacker constructs malformed composition data and sends it to the DWM process through legitimate windowing APIs. The missing validation causes the DWM to process the data as though it were well-formed, resulting in memory corruption within the SYSTEM-context process.
The attacker shapes the corruption to overwrite a function pointer or vtable entry within DWM's process space. When the corrupted pointer is later called, execution diverts to attacker-controlled code running as SYSTEM.
Exploitation Primitive
Crafted composition data via windowing APIs
--> DWM skips validation
--> memory corruption in SYSTEM-context DWM process
--> function pointer overwrite --> code execution as SYSTEM
Broader Significance
DWM is an increasingly popular target for privilege escalation because of its unique position: it is a SYSTEM process that accepts complex structured input from any user session. Unlike kernel drivers, it does not benefit from kernel-mode protections like SMEP or HVCI. Unlike typical user-mode services, it runs at the highest privilege level. CVE-2025-24058, along with CVE-2025-30400, demonstrates that DWM's input validation gaps remain an active area of exploitation research.