""ET EXPLOIT Possible Microsoft Exchange RCE Inbound M1 (CVE-2021-34473)""

SID: 2033684

Revision: 3

Class Type: attempted-admin

Metadata: affected_product Microsoft_Exchange, attack_target Server, created_at 2021_08_09, cve CVE_2021_34473, deployment Perimeter, deployment Internal, deployment SSLDecrypt, signature_severity Major, tag Exploit, updated_at 2022_12_23, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application

Reference:

  • cve

  • 2021-34473

Protocol: tcp

Source Network: any

Source Port: any

Destination Network: [$HOME_NET,$HTTP_SERVERS]

Destination Port: [443,444]

Flow: established,to_server

Contents:

  • Value: "POST"

  • Value: "/ews/exchange.asmx"

  • Value: "<s"

  • Value: "SerializedSecurityContext>"

  • Value: "Message>"

  • Value: "Attachments>"

  • Value: "Content>"

  • Value: "|60 c2 ac c2 aa|"

Within: 200

PCRE:

Special Options:

  • http_method

  • fast_pattern

  • http_uri

  • http_client_body

  • http_client_body

  • http_client_body

  • http_client_body

  • http_client_body

  • http_client_body

source