CVE-2020-3524 Cisco IOS XE ROM Monitor Software Vulnerability
Physical attackers can bypass secure boot by exploiting a debug option in ROMMON to load unsigned software images on Cisco routers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-3524?
CVE-2020-3524 is a medium-severity vulnerability in Cisco IOS XE ROMMON Software, published on 24 Sep 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the Cisco IOS XE ROM Monitor (ROMMON) Software for Cisco 4000 Series Integrated Services Routers, Cisco ASR 920 Series Aggregation Services Routers, Cisco ASR 1000 Series Aggregation Services Routers, and Cisco cBR-8 Converged Broadband Routers could allow an unauthenticated, physical attacker to break the chain of trust and load a compromised software image on an affected device. The vulnerability is due to the presence of a debugging configuration option in the affected software. An attacker could exploit this vulnerability by connecting to an affected device through the console, forcing the device into ROMMON mode, and writing a malicious pattern using that specific option on the device. A successful exploit could allow the attacker to break the chain of trust and load a compromised software image on the affected device. A compromised software image is any software image that has not been digitally signed by Cisco.
Which versions are affected by CVE-2020-3524?
It affects 1 product.
Products include Cisco Ios Xe Rom Monitor.
How do I fix CVE-2020-3524?
No fix has been published for CVE-2020-3524 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-3524 being exploited?
There is no known exploitation of CVE-2020-3524 in the wild and no public exploit code.
Other vulnerabilities in Cisco IOS XE ROMMON Software
Sources
Also known as GHSA-wvf6-cqwc-cf6x.