cve/2019/CVE-2019-20908.md

### [CVE-2019-20908](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20908)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4. Incorrect access permissions for the efivar_ssdt ACPI variable could be used by attackers to bypass lockdown or secure boot restrictions, aka CID-1957a85b0032.

### POC

#### Reference
- http://www.openwall.com/lists/oss-security/2020/07/20/6
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e
- https://usn.ubuntu.com/4426-1/

#### Github
- https://github.com/Annavid/CVE-2020-15780-exploit