CVE-2023-40549 Shim: out-of-bounds read in verify_buffer_authenticode() malformed pe file

What is CVE-2023-40549?

CVE-2023-40549 is a medium-severity memory corruption 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

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.

Weakness: CWE-125

Which versions are affected by CVE-2023-40549?

It affects 3 products.

Products include Fedoraproject Fedora, Redhat Enterprise Linux, Redhat Shim.

How do I fix CVE-2023-40549?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2023-40549 being exploited?

There is no known exploitation of CVE-2023-40549 in the wild and no public exploit code.

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• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

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

Also known as AZL-34095, AZL-34158, AZL-35256, AZL-35264, AZL-35273, BELL-CVE-2023-40549 and 3 more.