Описание
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, global-buffer-overflow was observed in FreeRDP's Base64 decoding path. The root cause appears to be implementation-defined char signedness: on Arm/AArch64 builds, plain char is treated as unsigned, so the guard c <= 0 can be optimized into a simple c != 0 check. As a result, non-ASCII bytes (e.g., 0x80-0xFF) may bypass the intended range restriction and be used as an index into a global lookup table, causing out-of-bounds access. This vulnerability is fixed in 3.20.1.
A global buffer overflow flaw has been discovered in FreeRDP. This global-buffer-overflow was observed in FreeRDP's Base64 decoding path. The root cause appears to be implementation-defined char signedness: on Arm/AArch64 builds, plain char is treated as unsigned, so the guard c <= 0 can be optimized into a simple c != 0 check. As a result, non-ASCII bytes (e.g., 0x80-0xFF) may bypass the intended range restriction and be used as an index into a global lookup table, causing out-of-bounds access.
Отчет
Red Hat products in their default configuration employ Address Space Layout Randomization (ASLR) which drastically increases the complexity of the successful exploitation of this flaw.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 6 | freerdp | Affected | ||
| Red Hat Enterprise Linux 10 | freerdp | Fixed | RHSA-2026:3068 | 23.02.2026 |
| Red Hat Enterprise Linux 10 | freerdp | Fixed | RHSA-2026:19033 | 19.05.2026 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | freerdp | Fixed | RHSA-2026:4121 | 09.03.2026 |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | freerdp | Fixed | RHSA-2026:4471 | 12.03.2026 |
| Red Hat Enterprise Linux 8 | freerdp | Fixed | RHSA-2026:3334 | 25.02.2026 |
| Red Hat Enterprise Linux 8.2 Advanced Update Support | freerdp | Fixed | RHSA-2026:4433 | 12.03.2026 |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | freerdp | Fixed | RHSA-2026:4439 | 12.03.2026 |
| Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | freerdp | Fixed | RHSA-2026:4439 | 12.03.2026 |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | freerdp | Fixed | RHSA-2026:4446 | 12.03.2026 |
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Дополнительная информация
Статус:
EPSS
7.4 High
CVSS3
Связанные уязвимости
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, global-buffer-overflow was observed in FreeRDP's Base64 decoding path. The root cause appears to be implementation-defined char signedness: on Arm/AArch64 builds, plain char is treated as unsigned, so the guard c <= 0 can be optimized into a simple c != 0 check. As a result, non-ASCII bytes (e.g., 0x80-0xFF) may bypass the intended range restriction and be used as an index into a global lookup table, causing out-of-bounds access. This vulnerability is fixed in 3.20.1.
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, global-buffer-overflow was observed in FreeRDP's Base64 decoding path. The root cause appears to be implementation-defined char signedness: on Arm/AArch64 builds, plain char is treated as unsigned, so the guard c <= 0 can be optimized into a simple c != 0 check. As a result, non-ASCII bytes (e.g., 0x80-0xFF) may bypass the intended range restriction and be used as an index into a global lookup table, causing out-of-bounds access. This vulnerability is fixed in 3.20.1.
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior ...
Уязвимость RDP-клиента FreeRDP, связанная с выходом операции за границы буфера в памяти, позволяющая нарушителю вызвать отказ в обслуживании
EPSS
7.4 High
CVSS3