Actively exploited in the wild
Cisco IOS Software Network Address Translation Denial-of-Service Vulnerability
Cisco - IOS software · Listed in the CISA KEV since 2022-03-03. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2017-12231
HighCVSS 7.5KEVSummary
Podatność w implementacji funkcjonalności translacji adresów sieciowych (NAT) w Cisco IOS od wersji 12.4 do 15.6 może pozwolić nieautoryzowanemu, zdalnemu atakującemu na spowodowanie stanu odmowy usługi (DoS) na podatnym urządzeniu. Problem wynika z nieprawidłowej translacji wiadomości H.323 korzystających z protokołu RAS, które są wysyłane do podatnego urządzenia przez pakiety IPv4.
Risk Assessment
Wykorzystanie tej podatności może doprowadzić do awarii i ponownego uruchomienia podatnego urządzenia, co skutkuje stanem DoS. Dotyczy to urządzeń Cisco skonfigurowanych do używania bramy warstwy aplikacji z NAT dla wiadomości H.323 RAS.
Recommendation
Zaleca się wyłączenie NAT ALG dla wiadomości H.323 RAS lub aktualizację oprogramowania do najnowszej wersji, aby zniwelować ryzyko związane z tą podatnością.
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Original NVD description (English source)
A vulnerability in the implementation of Network Address Translation (NAT) functionality in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to the improper translation of H.323 messages that use the Registration, Admission, and Status (RAS) protocol and are sent to an affected device via IPv4 packets. An attacker could exploit this vulnerability by sending a crafted H.323 RAS packet through an affected device. A successful exploit could allow the attacker to cause the affected device to crash and reload, resulting in a DoS condition. This vulnerability affects Cisco devices that are configured to use an application layer gateway with NAT (NAT ALG) for H.323 RAS messages. By default, a NAT ALG is enabled for H.323 RAS messages. Cisco Bug IDs: CSCvc57217.