alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Possible CrushFTP as2-to Anonymous User Rename Attempt (CVE-2023-43177)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/WebInterface/"; http.header; content:"as2-to|3a 20|"; nocase; http.cookie; content:"CrushAuth|3d|"; startswith; fast_pattern; reference:cve,2023-43177; reference:url,convergetp.com/2023/11/16/crushftp-zero-day-cve-2023-43177-discovered/; classtype:attempted-user; sid:2049265; rev:1; metadata:attack_target FTP_Server, created_at 2023_11_20, cve CVE_2023_43177, deployment Perimeter, deployment Internet, former_category WEB_SPECIFIC_APPS, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2023_11_20; target:dest_ip;)

Reference
CVE	CVE-2023-43177
URL	http://convergetp.com/2023/11/16/crushftp-zero-day-cve-2023-43177-discovered/

Metadata
attack_target	FTP_Server
created_at	2023_11_20
cve	CVE_2023_43177
deployment	Perimeter
deployment	Internet
former_category	WEB_SPECIFIC_APPS
performance_impact	Low
confidence	Medium
signature_severity	Major
updated_at	2023_11_20