Critical OS Command Injection Vulnerability in Citrix SD-WAN Center Discovered
Tenable Research has discovered a critical vulnerability in Citrix SD-WAN Center that could lead to remote code execution.
Background
On April 10, Citrix released a security bulletin for CVE-2019-10883, an operating system (OS) command injection vulnerability in Citrix SD-WAN Center 10.2.x before 10.2.1 and NetScaler SD-WAN Center 10.0.x before 10.0.7. Tenable Research discovered this vulnerability while developing a plugin for CVE-2017-6316 and reported it to Citrix.
Citrix Netscaler SD-WAN (software defined wide-area network) allows enterprises to manage their networks and create a virtual WAN. These types of products are used to support branch offices and remote data centers, and to maintain connectivity for cloud-based applications. According to the Citrix website, Netscaler SD-WAN is used in several industries like shipping, non-profit, hospitality and others.
Analisi
While reviewing CTX236992, Tenable Research observed that most of the vulnerabilities in this security bulletin required authentication. For the purpose of writing an uncredentialed Nessus plugin, we ended up looking at two unauthenticated command injection vulnerabilities mentioned in the writeup by the researchers who were credited in CTX236992. These vulnerabilities appeared to be linked to CVE-2017-6316, a vulnerability in the Citrix SD-WAN appliance.
Through our research of CVE-2017-6316, we discovered the Citrix SD-WAN Center 10.2.0.136.733315 was vulnerable to insufficient validation of user-supplied data ($username) in the controller located at /home/talariuser/www/app/Controller/UsersController.php (CVE-2019-10883).
Proof of concept
An unauthenticated remote attacker could exploit this vulnerability to execute arbitrary commands with root privileges. This could be achieved by running the following cURL command:
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'
The output from running this command:
root@VWC:/home/talariuser/www/app/Controller# cat /tmp/test
uid=0(root) gid=0(root) groups=0(root)
Vendor response
Tenable Research contacted Citrix in early February and confirmed they reproduced the vulnerability by the end of February. Citrix published its security bulletin for this vulnerability on April 10.
Solution
Users should upgrade to Citrix SD-WAN Center 10.2.1 or later and NetScaler SD-WAN Center 10.0.7 or later. Additionally, Citrix provided a list of best practices that should be used to harden the security of the SD-WAN Center.
Get more information
Learn more about Tenable, the first Cyber Exposure platform for holistic management of your modern attack surface.
Get a free 60-day trial of Tenable.io Vulnerability Management.
Articoli correlati
Cybersecurity Snapshot: Guide Unpacks Event-Logging Best Practices, as FAA Proposes Stronger Cyber Rules for Airplanes
August 23, 2024Looking to sharpen your team’s event logging and threat detection? A new guide offers plenty of best practices. Plus, the FAA wants airplanes to be more resilient to cyberattacks. Meanwhile, check out the critical vulnerabilities Tenable discovered in two Microsoft AI products. And get the latest on ransomware trends, vulnerability management practices and election security!
Detecting Risky Third-party Drivers on Windows Assets
August 7, 2024Kernel-mode drivers are critical yet risky components of the Windows operating system. Learn about their functionality, the dangers they pose, and how Tenable's new plugins can help identify and mitigate vulnerabilities using community-driven resources like LOLDrivers.
Never Trust User Inputs -- And AI Isn't an Exception: A Security-First Approach
August 6, 2024As AI transforms industries, security remains critical. Discover the importance of a security-first approach in AI development, the risks of open-source tools, and how Tenable's solutions can help protect your systems.
Cybersecurity Snapshot: Guide Unpacks Event-Logging Best Practices, as FAA Proposes Stronger Cyber Rules for Airplanes
August 23, 2024Looking to sharpen your team’s event logging and threat detection? A new guide offers plenty of best practices. Plus, the FAA wants airplanes to be more resilient to cyberattacks. Meanwhile, check out the critical vulnerabilities Tenable discovered in two Microsoft AI products. And get the latest on ransomware trends, vulnerability management practices and election security!
SSRFing the Web with the Help of Copilot Studio
August 20, 2024Tenable Research discovered a critical information-disclosure vulnerability in Microsoft’s Copilot Studio via a server-side request forgery (SSRF), which allowed researchers access to potentially sensitive information regarding service internals with potential cross-tenant impact.
Cybersecurity Snapshot: First Quantum-resistant Algorithms Ready for Use, While New AI Risks’ Database Is Unveiled
August 16, 2024NIST has released the first encryption algorithms that can protect data against quantum attacks. Plus, MIT launched a new database of AI risks. Meanwhile, the CSA published a paper outlining the unique risks involved in building systems that use LLMs. And get the latest on Q2’s most prevalent malware, the Radar/Dispossessor ransomware gang and CVE severity assessments!
- Threat Intelligence
- Threat Management
- Vulnerability Management
- Vulnerability Scanning