Privilege Escalation Risk in Intel Microcode for Debian Systems
Summary
CVE-2023-43758: Improper input validation in UEFI firmware for some Intel(R) processors may allow a privileged user to potentially enable escalation of privilege via local access. Affects intel-ucode versions < 20250211-r0. Fixed in 20250211-r0. How to fix ↓
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Background
Intel Microcode is a critical component of Intel processors that provides updates to the processor's firmware, enhancing performance and security. It is essential for maintaining system stability and security. However, certain versions of Intel Microcode in Debian 11, 12, and 13 have been found to have an improper input validation vulnerability that could be exploited by a privileged user.
Vulnerability Detail
The vulnerability, identified as CVE-2023-43758, arises from improper input validation in UEFI firmware for some Intel processors. This flaw may allow a privileged user to escalate their privileges through local access, potentially leading to unauthorized access to sensitive system resources. The vulnerability is particularly concerning as it can be exploited without requiring remote access, making it a significant risk for systems where local access is possible.
How To Fix
Minimum fixed version
20250211-r0
This is the first release that contains the fix.
sudo apk add --upgrade intel-ucodeTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the necessary updates as soon as they are available.
Conclusion
CVE-2023-43758 presents a significant risk for systems running Intel Microcode on Debian. It is crucial for users to stay informed about updates and apply patches promptly to mitigate the potential for privilege escalation. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2023-43758 is a vulnerability in Intel Microcode that allows a privileged user to potentially escalate their privileges via local access due to improper input validation.
The vulnerability affects Intel Microcode on Debian systems, specifically versions 11, 12, and 13.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
While there are no specific workarounds, it is advisable to limit local access to the system until the patch can be applied.
More details can be found in the official CVE database or through security advisories released by Debian.
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