Rule History

alert http $EXTERNAL_NET any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET HUNTING Cisco IOS XE Web Server Auth From Suspicious Username (cisco_tac_admin) (CVE-2023-20198) (Inbound)"; flow:established,to_server; http.method; content:"GET"; http.cookie; content:"Auth=cisco_tac_admin"; startswith; fast_pattern; reference:url,blog.talosintelligence.com/active-exploitation-of-cisco-ios-xe-software/; reference:cve,2023-20198; classtype:misc-activity; sid:2048938; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_10_30, cve CVE_2023_20198, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Informational, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_10_30, reviewed_at 2023_10_30;)