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35 lines
1.3 KiB
YAML
35 lines
1.3 KiB
YAML
title: Citrix Netscaler Attack CVE-2019-19781
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id: ac5a6409-8c89-44c2-8d64-668c29a2d756
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status: experimental
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description: Detects CVE-2019-19781 exploitation attempt against Citrix Netscaler, Application Delivery Controller and Citrix Gateway Attack
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author: Arnim Rupp, Florian Roth
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date: 2020/01/02
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modified: 2020/09/03
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references:
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- https://support.citrix.com/article/CTX267679
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- https://support.citrix.com/article/CTX267027
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- https://isc.sans.edu/diary/25686
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- https://twitter.com/mpgn_x64/status/1216787131210829826
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- https://github.com/x1sec/x1sec.github.io/blob/master/CVE-2019-19781-DFIR.md
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logsource:
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category: webserver
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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.'
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detection:
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selection:
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c-uri:
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- '*/../vpns/*'
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- '*/vpns/cfg/smb.conf'
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- '*/vpns/portal/scripts/*.pl*'
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condition: selection
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fields:
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- client_ip
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- vhost
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- url
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- response
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falsepositives:
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- Unknown
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level: critical
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tags:
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- attack.initial_access
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- attack.t1190
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