CVE-2023-40548
High
Description
A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase.
SeverityHigh
CVSS7.4
Exploit probability—
Product
Redhat Shim
PublishedJan 29, 2024
First seenJan 29, 2024
Weakness typeCWE-190Integer overflow
How to fix
Update
- redhat shim15.8 or later
Vendor advisories
- access.redhat.com/errata/RHSA-2024:1834
- access.redhat.com/errata/RHSA-2024:1835
- access.redhat.com/errata/RHSA-2024:1873
- access.redhat.com/errata/RHSA-2024:1876
- access.redhat.com/errata/RHSA-2024:1883
- access.redhat.com/errata/RHSA-2024:1902
- access.redhat.com/errata/RHSA-2024:1903
- access.redhat.com/errata/RHSA-2024:1959
- access.redhat.com/errata/RHSA-2024:2086
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redhat shim | v < 15.8, 15.8 | 15.8 |
| fedoraproject fedora | 39 | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.