CVE-2023-40547 | Date: (C)2024-01-25 (M)2024-05-16 |
A remote code execution vulnerability was found in Shim. The Shim boot support trusts attacker-controlled values when parsing an HTTP response. This flaw allows an attacker to craft a specific malicious HTTP request, leading to a completely controlled out-of-bounds write primitive and complete system compromise. This flaw is only exploitable during the early boot phase, an attacker needs to perform a Man-in-the-Middle or compromise the boot server to be able to exploit this vulnerability successfully.
CVSS Score and Metrics +CVSS Score and Metrics -CVSS V3 Severity: | CVSS V2 Severity: |
CVSS Score : 8.3 | CVSS Score : |
Exploit Score: 1.6 | Exploit Score: |
Impact Score: 6.0 | Impact Score: |
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CVSS V3 Metrics: | CVSS V2 Metrics: |
Attack Vector: ADJACENT_NETWORK | Access Vector: |
Attack Complexity: HIGH | Access Complexity: |
Privileges Required: NONE | Authentication: |
User Interaction: NONE | Confidentiality: |
Scope: CHANGED | Integrity: |
Confidentiality: HIGH | Availability: |
Integrity: HIGH | |
Availability: HIGH | |
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