""ET EXPLOIT Klog Server Command Injection Inbound (CVE-2021-3317)""

SID: 2032638

Revision: 2

Class Type: attempted-admin

Metadata: attack_target Server, created_at 2021_04_09, cve CVE_2021_3317, deployment Perimeter, deployment Internal, signature_severity Major, updated_at 2021_04_09, mitre_tactic_id TA0008, mitre_tactic_name Lateral_Movement, mitre_technique_id T1210, mitre_technique_name Exploitation_Of_Remote_Services

Reference:

  • cve

  • 2021-3317

Protocol: tcp

Source Network: any

Source Port: any

Destination Network: [$HTTP_SERVERS,$HOME_NET]

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "POST"

  • Value: "/async.php?action="

  • Value: "&source=|3b|"

Within:

PCRE:

Special Options:

  • http_method

  • http_client_body

  • http_client_body

  • fast_pattern

source