Ubuntu.comUB:CVE-2023-40549CVE-2023-40549
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
6.5 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
5.1%
An out-of-bounds read flaw was found in Shim due to the lack of proper
boundary verification during the load of a PE binary. This flaw allows an
attacker to load a crafted PE binary, triggering the issue and crashing
Shim, resulting in a denial of service.
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
6.5 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
5.1%