Ubuntu.comUB:CVE-2023-40546CVE-2023-40546
6.2 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.6 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
29.6%
A flaw was found in Shim when an error happened while creating a new ESL
variable. If Shim fails to create the new variable, it tries to print an
error message to the user; however, the number of parameters used by the
logging function doesn’t match the format string used by it, leading to a
crash under certain circumstances.
Bugs
Notes
| Author | Note |
|---|---|
| eslerm | UEFI Security Response Team states that dbx update is not needed secureboot-db should only ever be updated after shim secureboot-db is not updated on ESM releases as doing so would revoke install media keys Note that key revocation is required to protect against evil housekeeper attacks (such as BlackLotus) |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 18.04 | noarch | shim | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | shim | < any | UNKNOWN |
| ubuntu | 22.04 | noarch | shim | < any | UNKNOWN |
| ubuntu | 23.10 | noarch | shim | < any | UNKNOWN |
| ubuntu | 24.04 | noarch | shim | < 15.8-0ubuntu1 | UNKNOWN |
| ubuntu | 18.04 | noarch | shim-signed | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | shim-signed | < any | UNKNOWN |
| ubuntu | 22.04 | noarch | shim-signed | < any | UNKNOWN |
| ubuntu | 23.10 | noarch | shim-signed | < any | UNKNOWN |
| ubuntu | 24.04 | noarch | shim-signed | < 15.8 | UNKNOWN |
Related
6.2 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.6 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
29.6%