CVE-2023-40548 Shim: interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems

What is CVE-2023-40548?

CVE-2023-40548 is a high-severity vulnerability in Fedoraproject Fedora, published on 29 Jan 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-787, CWE-190

Which versions are affected by CVE-2023-40548?

It affects 2 products.

Products include Fedoraproject Fedora, Redhat Shim.

How do I fix CVE-2023-40548?

Apply the vendor's patch.

Is CVE-2023-40548 being exploited?

There is no known exploitation of CVE-2023-40548 in the wild and no public exploit code.

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All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-34093, AZL-34197, AZL-35255, AZL-35263, AZL-35275, BELL-CVE-2023-40548 and 3 more.