CVE-2020-3284 Cisco IOS XR Software Enhanced Preboot eXecution Environment Unsigned Code Execution Vulnerability
An unauthenticated remote attacker can execute unsigned code on Cisco IOS XR devices by compromising or impersonating the PXE boot server during the boot process.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-3284?
CVE-2020-3284 is a high-severity code injection vulnerability in Cisco Ios Xr, published on 6 Nov 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the enhanced Preboot eXecution Environment (PXE) boot loader for Cisco IOS XR 64-bit Software could allow an unauthenticated, remote attacker to execute unsigned code during the PXE boot process on an affected device. The PXE boot loader is part of the BIOS and runs over the management interface of hardware platforms that are running Cisco IOS XR Software only. The vulnerability exists because internal commands that are issued when the PXE network boot process is loading a software image are not properly verified. An attacker could exploit this vulnerability by compromising the PXE boot server and replacing a valid software image with a malicious one. Alternatively, the attacker could impersonate the PXE boot server and send a PXE boot reply with a malicious file. A successful exploit could allow the attacker to execute unsigned code on the affected device. Note: To fix this vulnerability, both the Cisco IOS XR Software and the BIOS must be upgraded. The BIOS code is included in Cisco IOS XR Software but might require additional installation steps. For further information, see the Fixed Software section of this advisory.
Weakness: CWE-284
Which versions are affected by CVE-2020-3284?
It affects 44 products.
Products include Cisco A99-Rp2-Se Firmware, Cisco A99-Rp2-Tr Firmware, Cisco A99-Rp3-Se Firmware, Cisco A99-Rp3-Tr Firmware, Cisco A99-Rsp-Se Firmware, Cisco A99-Rsp-Tr Firmware and 38 more.
How do I fix CVE-2020-3284?
No fix has been published for CVE-2020-3284 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2020-3284 being exploited?
There is no known exploitation of CVE-2020-3284 in the wild and no public exploit code.
Sources
Also known as GHSA-5xjq-f58j-4hph.