CVE-2020-15705
GRUB2: avoid loading unsigned kernels when GRUB is booted directly under secureboot without shim
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 2.04-1ubuntu26.1, 2.02-2ubuntu8.16, 2.02~beta2-36ubuntu3.26, 2.02~beta2-9ubuntu1.20
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions.
Timeline
- CVE published
- Record last updated
Affected versions
- Ubuntu grub2 in Ubuntu
From 20.04 LTS · fixed in 2.04-1ubuntu26.1; From 18.04 LTS · fixed in 2.02-2ubuntu8.16; From 16.04 LTS · fixed in 2.02~beta2-36ubuntu3.26; From 14.04 ESM · fixed in 2.02~beta2-9ubuntu1.20