CVE-2020-5357 Path traversal in CPG BIOS
A local attacker can trick an administrator into overwriting arbitrary files via symlink attacks during firmware updates, potentially leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-5357?
CVE-2020-5357 is a high-severity path traversal vulnerability in Dell CPG BIOS, published on 28 May 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Dell Dock Firmware Update Utilities for Dell Client Consumer and Commercial docking stations contain an Arbitrary File Overwrite vulnerability. The vulnerability is limited to the Dell Dock Firmware Update Utilities during the time window while being executed by an administrator. During this time window, a locally authenticated low-privileged malicious user could exploit this vulnerability by tricking an administrator into overwriting arbitrary files via a symlink attack. The vulnerability does not affect the actual binary payload that the update utility delivers.
Weakness: CWE-427
Which versions are affected by CVE-2020-5357?
It affects 4 products.
Products include Dell Dock Wd15 Firmware, Dell Dock Wd19 Firmware, Dell Precision Dual Usb-C Thunderbolt Dock - Tb18dc Firmware, Dell Thunderbolt Dock Tb16 Firmware.
How do I fix CVE-2020-5357?
No fix has been published for CVE-2020-5357 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2020-5357 being exploited?
There is no known exploitation of CVE-2020-5357 in the wild and no public exploit code.
Sources
Also known as GHSA-mrqc-gmff-v726.