Vulnerability · Published Jul 20, 2023 · Assigned by canonical
CVE-2022-28733Integer underflow in grub_net_recv_ip4_packets
High 8.1
In plain English
A high-severity security flaw in GNU GRUB from GNU Project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 70% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)1.3%top 30.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet can lead to an integer underflow in grub_net_recv_ip4_packets() function on rsm->total_len value. Under certain circumstances the total_len value may end up wrapping around to a small integer number which will be used in memory allocation. If the attack succeeds in such way, subsequent operations can write past the end of the buffer.
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 |
| Debian:12 | grub2 | 2.06-3 | DEBIAN-CVE-2022-28733 |
| Debian:13 | grub2 | 2.06-3 | DEBIAN-CVE-2022-28733 |
| Debian:14 | grub2 | 2.06-3 | DEBIAN-CVE-2022-28733 |
| 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 | USN-6355-1 |
| Ubuntu:22.04:LTS | grub2-signed | 1.187.3~22.04.1 | UBUNTU-CVE-2022-28733 |
| Ubuntu:22.04:LTS | grub2-unsigned | 2.06-2ubuntu14.1 | UBUNTU-CVE-2022-28733 |
| 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)
| Vendor | Product | Versions |
|---|---|---|
| GNU Project | GNU GRUB | 0 – before 2.06-3 |
Weakness: CWE-191 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H