""ET EXPLOIT Realtek SDK - Command Execution/Backdoor Access Inbound (CVE-2021-35395)""

SID: 2033839

Revision: 2

Class Type: attempted-user

Metadata: attack_target Server, created_at 2021_08_30, cve CVE_2021_35395, deployment Perimeter, deployment Internal, signature_severity Major, tag Exploit, updated_at 2021_08_30, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application

Reference:

• cve

• 2021-35395

Protocol: tcp

Source Network: any

Source Port: any

Destination Network: [$HOME_NET,$HTTP_SERVERS]

Destination Port: any

Flow: established,to_server

Contents:

• Value: "POST"

• Value: "/formSysCmd"

• Value: "sysCmd="

Within:

PCRE: "/\/formSysCmd$/U"

Special Options:

• http_method

• fast_pattern

• http_uri

• http_client_body

source