Actively exploited in the wild
Cisco IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service Vulnerability
Cisco - IOS and IOS XE 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-2017-6627
HighCVSS 7.5KEVSummary
Podatność w kodzie przetwarzania UDP w systemach Cisco IOS 15.1, 15.2, 15.4 oraz IOS XE 3.14 do 3.18 może pozwolić nieautoryzowanemu, zdalnemu atakującemu na spowodowanie zatoru w kolejce wejściowej systemu, co prowadzi do stanu odmowy usługi (DoS). Problem wynika z niezamkniętych gniazd UDP, które pozostają bezczynne.
Risk Assessment
Organizacja może doświadczyć przerwy w dostępności usług sieciowych, co może prowadzić do poważnych zakłóceń w działalności. Atakujący może wykorzystać tę podatność do zablokowania ruchu UDP, co wpłynie na funkcjonowanie systemów.
Recommendation
Zaleca się aktualizację oprogramowania Cisco IOS do najnowszej wersji, aby usunąć tę podatność. Dodatkowo, monitorowanie ruchu UDP oraz wdrożenie odpowiednich reguł zapory sieciowej może pomóc w ograniczeniu ryzyka.
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Original NVD description (English source)
A vulnerability in the UDP processing code of Cisco IOS 15.1, 15.2, and 15.4 and IOS XE 3.14 through 3.18 could allow an unauthenticated, remote attacker to cause the input queue of an affected system to hold UDP packets, causing an interface queue wedge and a denial of service (DoS) condition. The vulnerability is due to Cisco IOS Software application changes that create UDP sockets and leave the sockets idle without closing them. An attacker could exploit this vulnerability by sending UDP packets with a destination port of 0 to an affected device. A successful exploit could allow the attacker to cause UDP packets to be held in the input interfaces queue, resulting in a DoS condition. The input interface queue will stop holding UDP packets when it receives 250 packets. Cisco Bug IDs: CSCup10024, CSCva55744, CSCva95506.