CVE-2020-5376 Use after free in CPG BIOS
A local attacker can overwrite UEFI Boot Services to execute arbitrary code in System Management Mode, requiring a BIOS upgrade.
- 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-2020-5376?
CVE-2020-5376 is a medium-severity use after free vulnerability in Dell CPG BIOS, published on 2 Sep 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Dell Inspiron 7347 BIOS versions prior to A13 contain a UEFI BIOS Boot Services overwrite vulnerability. A local attacker with access to system memory may exploit this vulnerability by overwriting the EFI_BOOT_SERVICES structure to execute arbitrary code in System Management Mode (SMM).
Weakness: CWE-416
Which versions are affected by CVE-2020-5376?
It affects 1 product.
Products include Dell Inspiron 7347 Bios.
How do I fix CVE-2020-5376?
No fix has been published for CVE-2020-5376 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2020-5376 being exploited?
There is no known exploitation of CVE-2020-5376 in the wild and no public exploit code.
Sources
Also known as GHSA-c55q-m48j-xjc6.