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 |
Not vulnerable
(does not affect Secure Boot)
|
| focal |
Not vulnerable
(does not affect Secure Boot)
|
|
| impish |
Ignored
(end of life)
|
|
| jammy |
Not vulnerable
(does not affect Secure Boot)
|
|
| kinetic |
Not vulnerable
(does not affect Secure Boot)
|
|
| lunar |
Not vulnerable
(does not affect Secure Boot)
|
|
| mantic |
Not vulnerable
(does not affect Secure Boot)
|
|
| trusty |
Not vulnerable
(does not affect Secure Boot)
|
|
| upstream |
Needs triage
|
|
| xenial |
Not vulnerable
(does not affect Secure Boot)
|
|
|
grub2-signed Launchpad, Ubuntu, Debian |
bionic |
Released
(1.187.3~18.04.1)
|
| focal |
Released
(1.187.3~20.04.1)
|
|
| jammy |
Released
(1.187.3~22.04.1)
|
|
| kinetic |
Ignored
(end of life)
|
|
| lunar |
Not vulnerable
(1.192)
|
|
| mantic |
Not vulnerable
(1.193)
|
|
| trusty |
Needed
|
|
| upstream |
Needs triage
|
|
| xenial |
Needed
|
|
|
grub2-unsigned Launchpad, Ubuntu, Debian |
bionic |
Released
(2.06-2ubuntu14.1)
|
| focal |
Released
(2.06-2ubuntu14.1)
|
|
| jammy |
Released
(2.06-2ubuntu14.1)
|
|
| kinetic |
Ignored
(end of life)
|
|
| lunar |
Not vulnerable
(2.06-2ubuntu16)
|
|
| mantic |
Not vulnerable
(2.06-2ubuntu17)
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Needed
|
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 |