""ET WEB_CLIENT Spectre Kernel Memory Leakage JavaScript""

SID: 2025185

Revision: 4

Class Type: attempted-user

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_01_04, cve CVE_2017_5753, deployment Perimeter, performance_impact Low, signature_severity Major, updated_at 2018_02_06

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,from_server

Contents:

  • Value: "<script"

  • Value: "<"

  • Value: ".length"

  • Value: "^="

Within:

PCRE: "/^\s[^\s]+\x5b\s?[^\x5d\x7c]+\x7c\s?0\s?\x5d\s?\x7c\s?0\s*?\x3b/Rsi"

Special Options:

  • file_data

  • nocase

  • nocase

  • fast_pattern

source