rules/web/web_citrix_cve_2019_19781_exploit.yml

title: Citrix Netscaler Attack CVE-2019-19781
id: ac5a6409-8c89-44c2-8d64-668c29a2d756
status: test
description: Detects CVE-2019-19781 exploitation attempt against Citrix Netscaler, Application Delivery Controller and Citrix Gateway Attack
author: Arnim Rupp, Florian Roth
references:
  - https://support.citrix.com/article/CTX267679
  - https://support.citrix.com/article/CTX267027
  - https://isc.sans.edu/diary/25686
  - https://twitter.com/mpgn_x64/status/1216787131210829826
  - https://github.com/x1sec/x1sec.github.io/blob/master/CVE-2019-19781-DFIR.md
date: 2020/01/02
modified: 2021/11/27
logsource:
  category: webserver
  definition: 'Make sure that your Netscaler appliance logs all kinds of attacks (test with http://your-citrix-gw.net/robots.txt). The directory traversal with ../ might not be needed on certain cloud instances or for authenticated users, so we also check for direct paths. All scripts in portal/scripts are exploitable except logout.pl.'
detection:
  selection:
    c-uri:
      - '*/../vpns/*'
      - '*/vpns/cfg/smb.conf'
      - '*/vpns/portal/scripts/*.pl*'
  condition: selection
fields:
  - client_ip
  - vhost
  - url
  - response
falsepositives:
  - Unknown
level: critical
tags:
  - attack.initial_access
  - attack.t1190
rule: updated netscaler rule 2020-01-07 14:42:16 +01:00			`title: Citrix Netscaler Attack CVE-2019-19781`
add rule for Citrix Netscaler CVE-2019-19781 2020-01-03 01:48:29 +01:00			`id: ac5a6409-8c89-44c2-8d64-668c29a2d756`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`status: test`
Second round 2020-09-15 07:02:30 -06:00			`description: Detects CVE-2019-19781 exploitation attempt against Citrix Netscaler, Application Delivery Controller and Citrix Gateway Attack`
			`author: Arnim Rupp, Florian Roth`
add rule for Citrix Netscaler CVE-2019-19781 2020-01-03 00:34:52 +01:00			`references:`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`- https://support.citrix.com/article/CTX267679`
			`- https://support.citrix.com/article/CTX267027`
			`- https://isc.sans.edu/diary/25686`
			`- https://twitter.com/mpgn_x64/status/1216787131210829826`
			`- https://github.com/x1sec/x1sec.github.io/blob/master/CVE-2019-19781-DFIR.md`
			`date: 2020/01/02`
			`modified: 2021/11/27`
add rule for Citrix Netscaler CVE-2019-19781 2020-01-03 00:34:52 +01:00			`logsource:`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`category: webserver`
			`definition: 'Make sure that your Netscaler appliance logs all kinds of attacks (test with http://your-citrix-gw.net/robots.txt). The directory traversal with ../ might not be needed on certain cloud instances or for authenticated users, so we also check for direct paths. All scripts in portal/scripts are exploitable except logout.pl.'`
add rule for Citrix Netscaler CVE-2019-19781 2020-01-03 00:34:52 +01:00			`detection:`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`selection:`
			`c-uri:`
			`- '/../vpns/'`
			`- '*/vpns/cfg/smb.conf'`
			`- '/vpns/portal/scripts/.pl*'`
			`condition: selection`
add rule for Citrix Netscaler CVE-2019-19781 2020-01-03 00:34:52 +01:00			`fields:`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`- client_ip`
			`- vhost`
			`- url`
			`- response`
add rule for Citrix Netscaler CVE-2019-19781 2020-01-03 00:34:52 +01:00			`falsepositives:`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`- Unknown`
add rule for Citrix Netscaler CVE-2019-19781 2020-01-03 00:34:52 +01:00			`level: critical`
Second round 2020-09-15 07:02:30 -06:00			`tags:`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`- attack.initial_access`
			`- attack.t1190`