Critical Vulnerabilities Dubbed URGENT/11 Place Devices Running VxWorks at Risk of RCE Attacks

Ryan Seguin

Eleven vulnerabilities, including RCEs, denials of service, information leaks and logical flaws, were recently disclosed, impacting the RTOS VxWorks

Background

The Armis Research Team has released an advisory for URGENT/11, which contains six critical RCE and five additional vulnerabilities in VxWorks, a Real-Time Operating System (RTOS) found in over 2 billion devices, including critical industrial, medical and enterprise hardware. Wind River, the maintainer of VxWorks, released patches on July 19 for all 11 of the vulnerabilities.

Analysis

VxWorks is an RTOS found in a wide array of devices like firewalls, medical equipment and industrial control systems. The vulnerabilities found affect VxWorks’ TCP/IP stack (IPnet) and could allow attackers to circumvent Network Address Translation (NAT) and Firewalls via maliciously crafted IP packets. Wind River acquired the IPnet networking stack in 2006. Prior to this, the stack was licensed and used by other real-time operating system vendors, which potentially widens the number of affected devices that have yet to be patched. The scale and potential impact of these vulnerabilities create similar threats on par with the likes of WannaCry and ETERNALBLUE.

The following video from Armis provides an overview of URGENT/11 and its potential impact:

From Wind River's URGENT/11 security advisory, the following vulnerabilities and their respective details are:

CVE CVSSv3 Score Component Title CVE-2019-12256 9.8 TCP/IP Stack Stack overflow in the parsing of IPv4 packets’ IP options CVE-2019-12257 8.8 DHCP Client Heap overflow in DHCP Offer/ACK parsing inside ipdhcpc CVE-2019-12255 9.8 TCP Urgent Pointer TCP Urgent Pointer = 0 leads to integer underflow CVE-2019-12260 9.8 TCP Urgent Pointer TCP Urgent Pointer state confusion caused by malformed TCP AO option CVE-2019-12261 8.8 TCP Urgent Pointer TCP Urgent Pointer state confusion during connect() to a remote host CVE-2019-12263 8.1 TCP Urgent Pointer TCP Urgent Pointer state confusion due to race condition CVE-2019-12258 7.5 TCP Connection DoS of TCP connection via malformed TCP options CVE-2019-12259 6.3 TCP/IP Stack DoS via NULL dereference in IGMP parsing CVE-2019-12262 7.1 ARP Handler Handling of unsolicited Reverse ARP replies (Logical Flaw) CVE-2019-12264 7.1 DHCP Logical flaw in IPv4 assignment by the ipdhcpc DHCP client CVE-2019-12265 5.4 IGMP IGMP Information leak via IGMPv3 specific membership report

Proof of Concept

While no Proof of Concept (PoC) code has been released for these vulnerabilities, the Armis team has provided two videos demonstrating how an attacker could compromise internal assets from other internet-facing devices:

Solution

Organizations and individual users will need to apply updates from their respective device vendors in order to fix these vulnerabilities within their environments. Vendors like SonicWall and Xerox have reportedly released updates for their affected devices. Detection and mitigation may take some time, however, given the  sheer magnitude of the number of devices utilizing VxWorks.

Tenable will add active and passive plugins as patches and updates become available from different vendors. Our OS Identification plugin can enumerate hosts running VxWorks, which will be available in the plugin output section in the scan results for a given asset. Tenable Nessus Network Monitor (NNM) currently offers multiple VxWorks detection plugins, and proactively detects assets that may be running vulnerable versions of VxWorks.

For users seeking guidance on configuring NNM and creating useful notifications for VxWorks devices, please see our NNM configuration and usage documentation or reach out to our support team at https://support.tenable.com.

Identifying affected systems

A list of plugins to identify these vulnerabilities will appear here as they’re released. Please note that vulnerability detection plugin creation also relies on vendor support for any given device. We encourage organizations to examine the plugin output section of our informational detection plugins in their scan results to identify vulnerable systems in addition to scanning with direct vulnerability detection plugins.

Get more information

Join Tenable's Security Response Team on the Tenable Community.

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.

Read more >

Published on Jul 29, 2019

People also viewed

Business Cost Analyst - Cloud Infrastructure

San Jose California United States E Santa Clara St., San Jose, California, United States, 95113 Engineering Engineering
Your Role:Tenable is seeking a Business Cost Analyst of Cloud Infrastructure with strong MS Excel experience to assess, analyze and compile current costs and potentially determine initiatives to reduce and improve our cloud infrastructure cost for...

Professional Services Engagement Manager

Singapore Singapore Singapore North Bridge Road, Parkview Square, Singapore, 188788 Professional Services Professional Services
Your Role:The Professional Services Engagement Manager assists in the professional services business development and oversees the delivery of projects. The Professional Services Engagement Manager’s roles include tactical project management oversi...

UX Designer

Columbia Maryland United States Columbia Gateway Drive, Columbia, Maryland, United States, 21046 Engineering Engineering
Your Role:Tenable is looking for an extraordinary Senior UX Designer to join our team. Our group is chartered with creating the next generation of security products while at the same time pioneering unprecedented user experience in the digital sec...

Commercial Territory Manager - West

Columbia Maryland United States Columbia Gateway Drive, Columbia, Maryland, United States, 21046 Sales Sales
Your Role:The Commercial Territory Manager will meet and exceed quarterly sales quota by developing new opportunities within specific geographical territory.  Researching and identifying potential accounts; outbound cold calling to soliciting new ...

Senior Software Engineer (Java & Kotlin)

San Jose California United States E Santa Clara St., San Jose, California, United States, 95113 Engineering Engineering
Your Role:Tenable is looking for a Senior Software Engineer to join the Lumin product development team. As a Sr. Software Engineer you will drive projects end-to-end, collaborate on product requirements with Product Managers, architect and impleme...

Public Sector Channel Manager - Distribution

Reston Virginia United States Reston, Virginia, United States Channel Sales Sales
Your Role:The Public Sector Channel Manager-Distribution is responsible for establishing and managing relationships with the Distribution Partner(s).  The CM-Disty will act as a sales liaison between distributor and Tenable Channel Manager personn...

We have big plans for continued global growth, and we’re looking for people who are creative, flexible and dedicated to helping us build something great – something that matters.