Vulnerability · Published Jul 6, 2022 · Assigned by redhat
CVE-2021-3697
High 7.0
In plain English
A high-severity out-of-bounds write in grub2. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.0High
Exploit odds (30 days)0.5%top 59.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | grub2-common | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-common | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | grub2-efi-aa64 | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-efi-aa64 | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | grub2-efi-aa64-cdboot | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-efi-aa64-cdboot | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | grub2-efi-aa64-modules | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-efi-aa64-modules | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | grub2-efi-ia32 | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:8 | grub2-efi-ia32-cdboot | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:8 | grub2-efi-ia32-modules | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:8 | grub2-efi-x64 | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-efi-x64 | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | grub2-efi-x64-cdboot | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-efi-x64-cdboot | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | grub2-efi-x64-modules | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-efi-x64-modules | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | grub2-pc | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-pc | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | grub2-pc-modules | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-pc-modules | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:9 | grub2-ppc64le | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | grub2-ppc64le-modules | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-ppc64le-modules | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | grub2-tools | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-tools | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | grub2-tools-efi | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-tools-efi | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | grub2-tools-extra | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-tools-extra | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | grub2-tools-minimal | 1:2.02-123.el8_6.8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | grub2-tools-minimal | 1:2.06-27.el9_0.7.alma | ALSA-2022:5099 |
| AlmaLinux:8 | shim-aa64 | 15.6-1.el8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | shim-aa64 | 15.6-1.el9.alma | ALSA-2022:5099 |
| AlmaLinux:8 | shim-ia32 | 15.6-1.el8.alma | ALSA-2022:5095 |
| AlmaLinux:8 | shim-unsigned-x64 | 15.6-1.el8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | shim-unsigned-x64 | 15.6-1.el9.alma | ALSA-2022:5099 |
| AlmaLinux:8 | shim-x64 | 15.6-1.el8.alma | ALSA-2022:5095 |
| AlmaLinux:9 | shim-x64 | 15.6-1.el9.alma | ALSA-2022:5099 |
| Alpine:v3.20 | grub | 2.06-r13 | ALPINE-CVE-2021-3697 |
| Alpine:v3.21 | grub | 2.06-r13 | ALPINE-CVE-2021-3697 |
| Alpine:v3.22 | grub | 2.06-r13 | ALPINE-CVE-2021-3697 |
| Alpine:v3.23 | grub | 2.06-r13 | ALPINE-CVE-2021-3697 |
| Alpine:v3.24 | grub | 2.06-r13 | ALPINE-CVE-2021-3697 |
| Debian:12 | grub2 | 2.06-3 | DEBIAN-CVE-2021-3697 |
| Debian:13 | grub2 | 2.06-3 | DEBIAN-CVE-2021-3697 |
| Debian:14 | grub2 | 2.06-3 | DEBIAN-CVE-2021-3697 |
| Rocky Linux:8 | grub2 | 1:2.02-123.el8_6.8 | RLSA-2022:5095 |
| Rocky Linux:8 | mokutil | 1:0.3.0-11.el8_6.1 | RLSA-2022:5095 |
| Rocky Linux:9 | mokutil | 2:0.4.0-8.el9_0.1 | RLSA-2022:5099 |
| Rocky Linux:8 | shim | 0:15.6-1.el8 | RLSA-2022:5095 |
| Rocky Linux:9 | shim | 0:15.6-1.el9 | RLSA-2022:5099 |
| Rocky Linux:9 | shim | 0:15.6-1.el9.rocky.0.1 | RLSA-2022:5099 |
| Rocky Linux:8 | shim-unsigned-x64 | 0:15.6-1.el8 | RLSA-2022:5095 |
| Ubuntu:22.04:LTS | grub2-signed | 1.187.3~22.04.1 | UBUNTU-CVE-2021-3697 |
| Ubuntu:22.04:LTS | grub2-signed | 1.187.3~22.04.1 | USN-6355-1 |
| Ubuntu:22.04:LTS | grub2-unsigned | 2.06-2ubuntu14.1 | UBUNTU-CVE-2021-3697 |
| Ubuntu:22.04:LTS | grub2-unsigned | 2.06-2ubuntu14.1 | USN-6355-1 |
| Ubuntu:22.04:LTS | shim | 15.7-0ubuntu1 | USN-6355-1 |
| Ubuntu:22.04:LTS | shim-signed | 1.51.3 | USN-6355-1 |
Affected products (as reported)
Weakness: CWE-787
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1991687 x_refsource_MISC
- GLSA-202209-12 vendor-advisory, x_refsource_GENTOO
- https://security.netapp.com/advisory/ntap-20220930-0001/ x_refsource_CONFIRM