Actively exploited in the wild
Cisco IOS Software for Cisco Industrial Ethernet Switches PROFINET 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-2017-12235
HighCVSS 7.5KEVSummary
Podatność w implementacji protokołu PROFINET Discovery and Configuration (PN-DCP) w systemie Cisco IOS w wersjach od 12.2 do 15.6 może pozwolić nieautoryzowanemu, zdalnemu atakującemu na spowodowanie ponownego załadowania urządzenia, co prowadzi do stanu odmowy usługi (DoS). Problem wynika z nieprawidłowego parsowania pakietów PN-DCP Identify Request kierowanych do podatnego urządzenia.
Risk Assessment
Podatność ta może prowadzić do zakłócenia działania urządzeń Cisco, które są skonfigurowane do przetwarzania wiadomości PROFINET, co może wpłynąć na dostępność usług w organizacji.
Recommendation
Zaleca się aktualizację oprogramowania Cisco IOS do wersji, w której ta podatność została naprawiona, oraz monitorowanie ruchu sieciowego w celu wykrywania podejrzanych pakietów PN-DCP.
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Original NVD description (English source)
A vulnerability in the implementation of the PROFINET Discovery and Configuration Protocol (PN-DCP) for Cisco IOS 12.2 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to the improper parsing of ingress PN-DCP Identify Request packets destined to an affected device. An attacker could exploit this vulnerability by sending a crafted PN-DCP Identify Request packet to an affected device and then continuing to send normal PN-DCP Identify Request packets to the device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. This vulnerability affects Cisco devices that are configured to process PROFINET messages. Beginning with Cisco IOS Software Release 12.2(52)SE, PROFINET is enabled by default on all the base switch module and expansion-unit Ethernet ports. Cisco Bug IDs: CSCuz47179.