FreeRDP before 3.32.2 X11 Client Crash via Zero-Width RDPGFX ResetGraphics

Summary

FreeRDP before 3.32.2 contains a NULL pointer dereference vulnerability that allows malicious RDP servers to crash xfreerdp clients by sending a zero-width RDPGFX ResetGraphics PDU. The failed resize in gdi_resize_ex leaves the primary display null without ending the session, so a later bitmap update crashes the client in gdi_Bitmap_Paint.

Remediation

1. Inventory every FreeRDP FreeRDP deployment, including staging.
2. Upgrade FreeRDP FreeRDP to 3.32.2.
3. Confirm the running version after the upgrade.

References

• Advisoryhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-c426-ppvf-jpfg
• Advisoryhttps://www.vulncheck.com/advisories/freerdp-before-3.32.2-x11-client-crash-via-zero-width-rdpgfx-resetgraphics