CVE-2021-3696
Published: 6 July 2022
A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be considered Low as it's very complex to an attacker control the encoding and positioning of corrupted Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
grub2 Launchpad, Ubuntu, Debian |
bionic |
Needed
|
| focal |
Needed
|
|
| impish |
Ignored
(end of life)
|
|
| jammy |
Needed
|
|
| upstream |
Needs triage
|
|
| kinetic |
Not vulnerable
(2.06-2ubuntu12)
|
|
| lunar |
Not vulnerable
(2.06-2ubuntu16)
|
|
|
grub2-unsigned Launchpad, Ubuntu, Debian |
jammy |
Pending
(2.06-2ubuntu14.1)
|
| upstream |
Needs triage
|
|
| bionic |
Pending
(2.06-2ubuntu14.1)
|
|
| focal |
Pending
(2.06-2ubuntu14.1)
|
|
| lunar |
Not vulnerable
(2.06-2ubuntu16)
|
|
| xenial |
Needed
|
|
| trusty |
Does not exist
|
|
| kinetic |
Ignored
(end of life)
|
|
|
grub2-signed Launchpad, Ubuntu, Debian |
upstream |
Needs triage
|
| lunar |
Not vulnerable
(1.192)
|
|
| trusty |
Needed
|
|
| xenial |
Needed
|
|
| bionic |
Pending
(1.187.3~18.04.1)
|
|
| focal |
Pending
(1.187.3~20.04.1)
|
|
| jammy |
Pending
(1.187.3~22.04.1)
|
|
| kinetic |
Ignored
(end of life)
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 4.5 |
| Attack vector | Local |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | Low |
| Availability impact | Low |
| Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L |