SID: 2044009

Revision: 1

Class Type: attempted-admin

Metadata: affected_product IoT, attack_target Networking_Equipment, created_at 2023_01_27, cve CVE_2021_46441, deployment Perimeter, deployment Internal, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_01_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application

Reference:

  • cve

  • 2021-46442

Protocol: tcp

Source Network: any

Source Port: any

Destination Network: $HOME_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "POST"

  • Value: "/cgi-bin/webupg"

  • Value: "name|3d|shell&key|3d|twmode&cmd|3d|"

  • Value: "autoupgrade.asp|0d 0a|"

Within:

PCRE: "/^Referer\x3a\x20[^\r\n]+autoupgrade.asp/Hmi"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_client_body

  • http_header

source