cbcvebase.
CVE-2019-12990
published 2019-07-16

CVE-2019-12990: Citrix SD-WAN 10.2.x before 10.2.3 and NetScaler SD-WAN 10.0.x before 10.0.8 allow Directory Traversal.

PriorityP186critical9.8CVSS 3.0
AVNACLPRNUINSUCHIHAH
ITWEXPLOITVulnCheck KEV
Exploited in the wild
EPSS
39.34%
98.4th percentile
Citrix SD-WAN 10.2.x before 10.2.3 and NetScaler SD-WAN 10.0.x before 10.0.8 allow Directory Traversal.

Affected

6 ranges
VendorProductVersion rangeFixed in
citrixcitrix_sd-wan
citrixnetscaler_adc_gateway
citrixnetscaler_sd-wan>= 10.0 < 10.0.810.0.8
citrixsd-wan
citrixsd-wan>= 10.2 < 10.2.310.2.3
citrixxenserver

Detection & IOCsextracted from sources · hover to see the quote

urlPOST /Collector/appliancesettings/applianceSettingsFileTransfer HTTP/1.1
path/home/talariuser/www/app/webroot/files/
commandfilename=../../../../../../home/talariuser/www/app/webroot/files/{{randstr}}&filedata=
urlGET /talari/app/files/
otherhttp.title:"Citrix SD-WAN"
  • Detect exploitation attempts by monitoring POST requests to /Collector/appliancesettings/applianceSettingsFileTransfer with directory traversal sequences (e.g., ../../) in the 'filename' parameter.
  • Monitor for file creation under /home/talariuser/www/app/webroot/files/ by the www-data user, especially PHP files, which may indicate successful exploitation.
  • Detect follow-up GET requests to /talari/app/files/ after a suspicious POST to applianceSettingsFileTransfer, which may indicate an attacker verifying or executing a dropped webshell.
  • Traffic is routed through the Collector controller; monitor for unauthenticated access to the /Collector/ path on Citrix SD-WAN Center instances.
  • Use Shodan/FOFA queries to identify exposed Citrix SD-WAN Center instances: http.title:"Citrix SD-WAN" or title="citrix sd-wan".
  • ·The vulnerable endpoint /Collector/appliancesettings/applianceSettingsFileTransfer is exploitable without authentication (unauth), making this a critical unauthenticated RCE vector.
  • ·The vulnerability affects Citrix SD-WAN 10.2.x before 10.2.3 and NetScaler SD-WAN 10.0.x before 10.0.8; detections should be scoped to these versions.
  • ·The Content-Type for the exploit POST is application/x-www-form-urlencoded; WAF/IDS rules should inspect this content type for traversal sequences in the filename parameter.

CVSS provenance

nvdv3.09.8CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv2.010.0CRITICALAV:N/AC:L/Au:N/C:C/I:C/A:C
vulncheck9.8CRITICAL
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