Rule History

alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS [Perch Security] Nagios XI Web SSH Terminal sshterm Cross-Site Scripting (CVE-2021-25299)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/nagiosxi/admin/sshterm.php?"; startswith; fast_pattern; content:"url="; nocase; pcre:"/^.+(script|onerror|onmouse[a-z]+|onkey[a-z]+|onload|onunload|ondragdrop|onblur|onfocus|onclick|ondblclick|onsubmit|onreset|onselect|onchange|style\x3D)/Ri"; reference:url,www.connectwise.com/resources/cve-spotlight-nagios-xi-cve-2021-25296-25297-25298-25299; reference:cve,2021-25299; classtype:web-application-attack; sid:2059094; rev:2; metadata:affected_product Nagios, attack_target Web_Server, tls_state plaintext, created_at 2025_01_09, cve CVE_2021_25299, deployment Perimeter, deployment Internal, deployment Datacenter, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2025_01_10, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)