grub2: grub 2.05 reintroduced CVE-2020-15705
Published Mar 15, 2021
6.4
MEDIUMCVSS 3.1
EPSS 0.47%
Description
If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grub2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism.
Affected products
- Vendor n/a Product Grub2 Defaultn/a
- Version Fixed in 2.06StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Grub2 | n/a |
|
No data.
Red Hat Enterprise Linux 7
grub2
Not affected
Red Hat Enterprise Linux 8
grub2
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | grub2 | Not affected | n/a |
| Red Hat Enterprise Linux 8 | grub2 | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Enterprise Linux 7 and 8 are not affected by this issue, as both versions doesn't ship the shim_lock mechanism.
References (4)
- https://access.redhat.com/security/cve/CVE-2021-3418 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1933757 x_refsource_MISCIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2021-3418
- https://www.cve.org/CVERecord?id=CVE-2021-3418
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2021-3418 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1933757 | x_refsource_MISCIssue TrackingThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2021-3418 | ||
| https://www.cve.org/CVERecord?id=CVE-2021-3418 |
Change history (0)
No recorded changes yet.