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An out-of-bounds read flaw was found in Shim when it tried to validate the SBAT information. This issue may expose sensitive data during the system's boot phase.

CVE-2023-40550 is a medium severity vulnerability identified in the Shim bootloader component of Red Hat Enterprise Linux 7. Shim is a small bootloader used to facilitate secure boot by validating signatures and ensuring trusted boot components. This vulnerability arises from an out-of-bounds read error during the validation of SBAT (Software Bill of Materials Attestation) information, a mechanism designed to attest the integrity and provenance of software components during boot. The out-of-bounds read can lead to exposure of sensitive memory contents during the early boot phase, potentially leaking confidential information. The flaw requires local access with low privileges (AV:L, PR:L) and does not require user interaction (UI:N). The vulnerability does not impact system integrity or availability but compromises confidentiality. The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) reflects these characteristics. No public exploits or active exploitation have been reported to date. The vulnerability affects Red Hat Enterprise Linux 7 systems that use Shim for secure boot, which is common in enterprise and government environments. Since the flaw occurs during boot, it could be leveraged by an attacker with local access to extract sensitive data before the OS fully loads. This could include cryptographic keys or other protected information residing in memory. The vulnerability highlights the importance of secure boot components and their validation logic. Red Hat is expected to release patches to address this issue by correcting the bounds checking in the SBAT validation code. Until patches are applied, organizations should limit local access and monitor for suspicious activity. Given the nature of the flaw, remote exploitation is not feasible, reducing the immediate risk of widespread attacks.

Detailed information about CVE-2023-40550: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 7 affecting Red Hat Red Hat Enterprise Linux 7. Get real-time 

CVE-2023-40550: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 7 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-40550: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 7

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