CVE-2023-30312
HighSummary
W OpenWrt w wersjach 18.06, 19.07, 21.02, 22.03 i nowszych odkryto problem, który pozwala atakującym spoza ścieżki na przejęcie sesji TCP. Może to prowadzić do odmowy usługi oraz podszywania się pod klienta lub serwer.
Risk Assessment
Organizacja może być narażona na ataki, które mogą skutkować utratą danych lub dostępem do poufnych informacji, co może prowadzić do poważnych konsekwencji finansowych i reputacyjnych.
Recommendation
Zaleca się wyłączenie opcji nf_conntrack_tcp_no_window_check lub aktualizację do najnowszej wersji OpenWrt, aby zminimalizować ryzyko przejęcia sesji TCP.
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Original NVD description (English source)
An issue discovered in OpenWrt 18.06, 19.07, 21.02, 22.03, and beyond allows off-path attackers to hijack TCP sessions, which could lead to a denial of service, impersonating the client to the server (e.g., for access to files over FTP), and impersonating the server to the client (e.g., to deliver false information from a finance website). This occurs because nf_conntrack_tcp_no_window_check is true by default.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

