CVE-2020-5756 Command injection in Grandstream GWN7000
Authenticated attackers can execute arbitrary OS commands on Grandstream GWN7000 routers via an undocumented API that modifies the system crontab.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-5756?
CVE-2020-5756 is a high-severity command injection vulnerability in Tenable Grandstream GWN7000, published on 17 Jul 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Grandstream GWN7000 firmware version 1.0.9.4 and below allows authenticated remote users to modify the system's crontab via undocumented API. An attacker can use this functionality to execute arbitrary OS commands on the router.
Which versions are affected by CVE-2020-5756?
It affects 1 product.
Products include Grandstream Gwn7000 Firmware.
How do I fix CVE-2020-5756?
No fix has been published for CVE-2020-5756 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2020-5756 being exploited?
There is no known exploitation of CVE-2020-5756 in the wild and no public exploit code.
Other vulnerabilities in Tenable Grandstream GWN7000
Sources
Also known as GHSA-hcrv-c4wc-hj94.