""ET WEB_SPECIFIC_APPS Possible Skype for Business SSRF Attempt (CVE-2023-41763)""

SID: 2048538

Revision: 1

Class Type: web-application-attack

Metadata: affected_product Skype_For_Business, attack_target Web_Server, created_at 2023_10_11, cve CVE_2023_41763, deployment Internal, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Minor, updated_at 2023_10_11

Reference:

  • cve

  • 2023-41763

Protocol: tcp

Source Network: $HTTP_SERVERS

Source Port: any

Destination Network: any

Destination Port: any

Flow: established,to_server

Contents:

  • Value: "GET"

  • Value: "LCS-Server"

  • Value: "Application/vnd.microsoft.lync.meeting+xml"

Within:

PCRE: "/^Accept\x3a\x20[^\r\n]+Application\//vnd.microsoft.lync.meeting+xml/Hmi"

Special Options:

  • http_method

  • http_header

  • fast_pattern

  • http_header

source