CVE-2025-20136
HighSummary
Podatność w funkcji inspekcji DNS dla translacji adresów sieciowych IPv4 i IPv6 w oprogramowaniu Cisco Secure Firewall ASA i FTD może umożliwić nieautoryzowanemu, zdalnemu atakującemu spowodowanie niespodziewanego przeładowania urządzenia, co prowadzi do stanu odmowy usługi (DoS). Problem wynika z nieskończonej pętli, która występuje podczas przetwarzania pakietów DNS z włączoną inspekcją DNS.
Risk Assessment
Atakujący może wykorzystać tę podatność, wysyłając spreparowane pakiety DNS, co może prowadzić do awarii urządzenia i przerwy w dostępności usług. To stwarza poważne ryzyko dla ciągłości działania organizacji.
Recommendation
Zaleca się aktualizację oprogramowania Cisco Secure Firewall ASA i FTD do najnowszej wersji, aby usunąć tę podatność. Dodatkowo, warto rozważyć ograniczenie dostępu do inspekcji DNS tylko dla zaufanych źródeł.
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Original NVD description (English source)
A vulnerability in the function that performs IPv4 and IPv6 Network Address Translation (NAT) DNS inspection for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to an infinite loop condition that occurs when a Cisco Secure ASA or Cisco Secure FTD device processes DNS packets with DNS inspection enabled and the device is configured for NAT44, NAT64, or NAT46. An attacker could exploit this vulnerability by sending crafted DNS packets that match a static NAT rule with DNS inspection enabled through an affected device. A successful exploit could allow the attacker to create an infinite loop and cause the device to reload, resulting in a DoS condition.

