CVE-2009-0778
HighSummary
Funkcja icmp_send w jądrze Linux przed wersją 2.6.25, skonfigurowana jako router z trasą REJECT, nie zarządza poprawnie pamięcią podręczną docelową niezależną od protokołu w niektórych sytuacjach. To może prowadzić do odmowy usługi poprzez wysyłanie dużej liczby pakietów do wielu adresów IP w tej trasie REJECT.
Risk Assessment
Atakujący mogą spowodować przerwy w łączności, co wpływa na dostępność usług w organizacji. Wykorzystanie tej podatności może prowadzić do poważnych zakłóceń w działaniu sieci.
Recommendation
Zaleca się aktualizację jądra Linux do wersji 2.6.25 lub nowszej, aby usunąć tę podatność. Dodatkowo, warto monitorować ruch sieciowy w celu wykrywania potencjalnych ataków DDoS.
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Original NVD description (English source)
The icmp_send function in net/ipv4/icmp.c in the Linux kernel before 2.6.25, when configured as a router with a REJECT route, does not properly manage the Protocol Independent Destination Cache (aka DST) in some situations involving transmission of an ICMP Host Unreachable message, which allows remote attackers to cause a denial of service (connectivity outage) by sending a large series of packets to many destination IP addresses within this REJECT route, related to an "rt_cache leak."

