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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.

CVE-2023-40549 is a medium-severity vulnerability identified in Shim, a component used in the boot process of Red Hat Enterprise Linux 7. The flaw arises from an out-of-bounds read caused by insufficient boundary checks when loading Portable Executable (PE) binaries. Specifically, Shim fails to properly verify the size and structure of a PE binary before processing it, allowing an attacker to craft a malicious PE binary that triggers an out-of-bounds read. This results in Shim crashing, which leads to a denial of service (DoS) condition during the boot or secure boot process. The vulnerability does not allow for code execution or data leakage, but it impacts system availability by preventing normal boot operations. The attack vector is local, meaning an attacker must have local access to the system to supply the malicious PE binary. No privileges or user interaction are required, which lowers the barrier for exploitation once local access is obtained. The CVSS v3.1 base score is 6.2, reflecting the medium severity due to the impact on availability and the ease of exploitation without privileges. No known exploits have been reported in the wild, and no patches were linked in the provided information, but it is expected that Red Hat will release updates to address this issue. Organizations running Red Hat Enterprise Linux 7, particularly those relying on secure boot mechanisms involving Shim, should be aware of this vulnerability and prepare to apply patches promptly.

Detailed information about CVE-2023-40549: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 7 affecting Red Hat Red Hat Enterprise Linux 7. Get real-time 

CVE-2023-40549: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 7 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-40549: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 7

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