CVE-2026-41502
HighSummary
W bibliotece BACnet Stack przed wersją 1.4.3 występuje podatność typu off-by-one w dekoderze usługi ReadPropertyMultiple, która pozwala nieautoryzowanym atakującym zdalnie odczytać jeden bajt poza przydzielonym buforem. Problem występuje w funkcji rpm_decode_object_id(), gdzie sprawdzany jest długość apdu_len, ale następnie odczytywane są wszystkie 6 pozycji bajtowych.
Risk Assessment
Podatność ta może prowadzić do awarii urządzeń wbudowanych BACnet, co może zakłócić działanie systemów i usług w organizacji. Atakujący mogą wykorzystać tę lukę do zdalnego dostępu do pamięci, co stwarza ryzyko dla integralności systemu.
Recommendation
Zaleca się aktualizację biblioteki BACnet Stack do wersji 1.4.3 lub nowszej, aby usunąć tę podatność. Dodatkowo, warto rozważyć ograniczenie dostępu do usługi ReadPropertyMultiple w przypadku, gdy nie jest ona niezbędna.
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Original NVD description (English source)
BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an off-by-one out-of-bounds read vulnerability in bacnet-stack's ReadPropertyMultiple service decoder allows unauthenticated remote attackers to read one byte past an allocated buffer boundary by sending a crafted RPM request with a truncated object identifier. The vulnerability is in rpm_decode_object_id(), which checks apdu_len < 5 but then accesses all 6 byte positions (indices 0-5) — consuming 1 byte for the context tag, 4 bytes for the object ID, then reading apdu[5] for the opening tag check. A 5-byte input passes the length check but causes a 1-byte OOB read, leading to crashes on embedded BACnet devices. The vulnerability exists in src/bacnet/rpm.c and affects any deployment that enables the ReadPropertyMultiple confirmed service handler (enabled by default in the reference server). This vulnerability is fixed in 1.4.3.

