CVE-2022-28737
Published: 20 July 2023
There's a possible overflow in handle_image() when shim tries to load and execute crafted EFI executables; The handle_image() function takes into account the SizeOfRawData field from each section to be loaded. An attacker can leverage this to perform out-of-bound writes into memory. Arbitrary code execution is not discarded in such scenario.
Notes
| Author | Note |
|---|---|
| mdeslaur | This is fixed in 15.7-0ubuntu1 that is currently in the -updates pocket of focal, jammy, and kinetic. |
| eslerm | keys not updated on ESM releases as doing so would revoke install media keys |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
shim Launchpad, Ubuntu, Debian |
bionic |
Pending
(15.7-0ubuntu1)
|
| focal |
Released
(15.7-0ubuntu1)
|
|
| impish |
Ignored
(end of life)
|
|
| jammy |
Released
(15.7-0ubuntu1)
|
|
| kinetic |
Ignored
(end of life, was needed)
|
|
| lunar |
Not vulnerable
(15.7-0ubuntu1)
|
|
| mantic |
Not vulnerable
(15.7-0ubuntu1)
|
|
| noble |
Not vulnerable
(15.7-0ubuntu1)
|
|
| trusty |
Ignored
(install media keys will never be revoked)
|
|
| upstream |
Released
(15.6)
|
|
| xenial |
Ignored
(install media keys will never be revoked)
|
|
|
Patches: upstream: https://github.com/rhboot/shim/commit/e99bdbb827a50cde019393d3ca1e89397db221a7 upstream: https://github.com/rhboot/shim/commit/159151b6649008793d6204a34d7b9c41221fb4b0 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.5 |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | High |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H |