FreeRDP before 3.28.0 (affected 3.x through 3.27.1) contains a double-free vulnerability in freerdp_client_rdp_file_apply_to_settings() (client/common/file.c) when parsing the selectedmonitors field of a .rdp connection file. The MonitorIds array is allocated through the settings object, and a raw non-owning pointer to it is freed on the strtoul error path without clearing settings->MonitorIds, leaving it dangling; at teardown freerdp_settings_free() frees the same buffer again. An attacker who convinces a victim to open a crafted .rdp file with oversized monitor tokens can trigger a size-controlled double-free in any FreeRDP CLI client (xfreerdp/sdl-freerdp/wlfreerdp) in the default configuration.
Weakness
The product calls free() twice on the same memory address.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Freerdp | Freerdp | 3.0.0 (including) | 3.28.0 (excluding) |
| Red Hat Enterprise Linux 10 | RedHat | freerdp-2:3.10.3-12.el10_2.8 | * |
| Freerdp3 | Ubuntu | noble | * |
| Freerdp3 | Ubuntu | resolute | * |
| Freerdp3 | Ubuntu | upstream | * |
Potential Mitigations
References
- https://github.com/FreeRDP/FreeRDP/commit/1f7a716d39b5605bb8a83b0c3c97a6ce386609ef
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-f27x-frr8-j9hc
- https://www.vulncheck.com/advisories/freerdp-before-double-free-via-selectedmonitors
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-f27x-frr8-j9hc