Описание
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it validates a destination rectangle that is clamped to UINT16_MAX, but then performs the copy using the original cacheEntry->width/height. This can cause a large out-of-bounds heap write and may lead to client crashes or code execution. This bug is reachable from a malicious RDP server, but only when the client has RDPGFX enabled. This vulnerability is fixed in 3.26.0.
A heap-buffer-overflow vulnerability exists in FreeRDP when handling Remote Desktop Protocol Graphics (RDPGFX). A malicious or compromised RDP server can exploit this flaw by sending specially crafted graphics packets to a connected client, potentially crashing the client application (Denial of Service) or executing arbitrary code on the user's machine.
Отчет
An Important-rated heap-buffer-overflow vulnerability exists in FreeRDP clients using the RDPGFX feature. If a user connects to a malicious RDP server, the server can trigger this flaw to cause a client crash (Denial of Service) or execute arbitrary code on the client machine. The risk is limited to users connecting to untrusted hosts with RDPGFX enabled.
Меры по смягчению последствий
To mitigate this vulnerability, disable the RDPGFX graphics acceleration feature in your FreeRDP client configuration. Additionally, avoid using FreeRDP to connect to untrusted or unknown external servers. This may cause a temporary disruption in service for your users.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 6 | freerdp | Out of support scope | ||
| Red Hat Enterprise Linux 7 | freerdp | Affected | ||
| Red Hat Enterprise Linux 8 | freerdp | Affected | ||
| Red Hat Enterprise Linux 9 | freerdp | Affected | ||
| Red Hat Enterprise Linux 10 | freerdp | Fixed | RHSA-2026:36203 | 07.07.2026 |
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Дополнительная информация
Статус:
EPSS
8.8 High
CVSS3
Связанные уязвимости
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it validates a destination rectangle that is clamped to UINT16_MAX, but then performs the copy using the original cacheEntry->width/height. This can cause a large out-of-bounds heap write and may lead to client crashes or code execution. This bug is reachable from a malicious RDP server, but only when the client has RDPGFX enabled. This vulnerability is fixed in 3.26.0.
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it validates a destination rectangle that is clamped to UINT16_MAX, but then performs the copy using the original cacheEntry->width/height. This can cause a large out-of-bounds heap write and may lead to client crashes or code execution. This bug is reachable from a malicious RDP server, but only when the client has RDPGFX enabled. This vulnerability is fixed in 3.26.0.
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior ...
Уязвимость функции gdi_CreateSurface() RDP-клиента FreeRDP, позволяющая нарушителю выполнить произвольный код и вызвать отказ в обслуживании
EPSS
8.8 High
CVSS3