""ET EXPLOIT Possible Realtek SDK - Stack Buffer Overflow via UPnP SUBSCRIBE Callback Header Inbound (CVE-2021-35393)""

SID: 2033843

Revision: 2

Class Type: attempted-user

Metadata: attack_target Server, created_at 2021_08_30, cve CVE_2021_35393, 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

  • 2021-35393

Protocol: tcp

Source Network: any

Source Port: any

Destination Network: [$HOME_NET,$HTTP_SERVERS]

Destination Port: any

Flow: established,to_server

Contents:

  • Value: "SUBSCRIBE"

  • Value: "/upnp/"

  • Value: "Callback|3a 20 3c|http"

Within:

PCRE: "/^Callback\x3a\x20\x3chttp[^\x3a]+\x3a\d{1,5}[^\/]/Hmi"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_header

source