CVE-2026-4747
HighSummary
Podatność CVE-2026-4747 dotyczy błędu w walidacji pakietów RPCSEC_GSS, który prowadzi do przepełnienia bufora na stosie. Złośliwy klient może wykorzystać tę lukę, aby wywołać przepełnienie bufora, co umożliwia zdalne wykonanie kodu w jądrze.
Risk Assessment
Organizacja narażona jest na zdalne wykonanie kodu w jądrze przez nieautoryzowanych użytkowników, co może prowadzić do poważnych naruszeń bezpieczeństwa systemu. W przypadku aplikacji użytkowych z załadowanym librpcgss_sec, ryzyko to dotyczy również zdalnych ataków z dowolnego klienta.
Recommendation
Zaleca się monitorowanie i aktualizację systemu, aby usunąć tę podatność, a także ograniczenie dostępu do serwera NFS tylko dla zaufanych użytkowników. Warto również przeanalizować aplikacje korzystające z librpcgss_sec w celu oceny ich bezpieczeństwa.
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Original NVD description (English source)
Each RPCSEC_GSS data packet is validated by a routine which checks a signature in the packet. This routine copies a portion of the packet into a stack buffer, but fails to ensure that the buffer is sufficiently large, and a malicious client can trigger a stack overflow. Notably, this does not require the client to authenticate itself first. As kgssapi.ko's RPCSEC_GSS implementation is vulnerable, remote code execution in the kernel is possible by an authenticated user that is able to send packets to the kernel's NFS server while kgssapi.ko is loaded into the kernel. In userspace, applications which have librpcgss_sec loaded and run an RPC server are vulnerable to remote code execution from any client able to send it packets. We are not aware of any such applications in the FreeBSD base system.