CVE-2026-21878
HighSummary
W bibliotece BACnet Stack, przed wersją 1.5.0.rc3, odkryto podatność w funkcjonalności zapisu plików, która nie weryfikuje ścieżek plików podawanych przez użytkownika. Umożliwia to atakującym zapis plików w dowolnych katalogach.
Risk Assessment
Podatność ta może prowadzić do nieautoryzowanego dostępu do systemu plików, co stwarza ryzyko wycieku danych lub złośliwego oprogramowania w systemach wbudowanych.
Recommendation
Zaleca się aktualizację do wersji 1.5.0.rc3 lub nowszej, aby usunąć tę podatność oraz wprowadzenie dodatkowych mechanizmów weryfikacji ścieżek plików.
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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 1.5.0.rc3, a vulnerability has been discovered in BACnet Stack's file writing functionality where there is no validation of user-provided file paths, allowing attackers to write files to arbitrary directories. This affects apps/readfile/main.c and ports/posix/bacfile-posix.c. This vulnerability is fixed in 1.5.0.rc3.