The version of microcode_ctl installed on the remote host is prior to 2.1-47.40. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2022-1606 advisory.

    2024-05-09: CVE-2021-33117 was added to this advisory.

    Improper access control for some 3rd Generation Intel(R) Xeon(R) Scalable Processors before BIOS version     MR7, may allow a local attacker to potentially enable information disclosure via local access.
    (CVE-2021-33117)

    A flaw was found in hw. Processor optimization removal or modification of security-critical code for some     Intel(R) processors may potentially allow an authenticated user to enable information disclosure via local     access. (CVE-2022-21151)

    A flaw was found in hw. Incomplete cleanup in specific special register write operations for some     Intel Processors may allow an authenticated user to enable information disclosure via local access.
    (CVE-2022-21166)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5486-1 advisory.

    It was discovered that some Intel processors did not implement sufficient control flow management. A local     attacker could use this to cause a denial of service. (CVE-2021-0127)

    Joseph Nuzman discovered that some Intel processors did not properly initialise shared resources. A local     attacker could use this to obtain sensitive information. (CVE-2021-0145)

    Mark Ermolov, Dmitry Sklyarov and Maxim Goryachy discovered that some Intel processors did not prevent     test and debug logic from being activated at runtime. A local attacker could use this to escalate     privileges. (CVE-2021-0146)

    It was discovered that some Intel processors did not properly restrict access in some situations. A local     attacker could use this to obtain sensitive information. (CVE-2021-33117)

    Brandon Miller discovered that some Intel processors did not properly restrict access in some situations.
    A local attacker could use this to obtain sensitive information or a remote attacker could use this to     cause a denial of service. (CVE-2021-33120)

    It was discovered that some Intel processors did not completely perform cleanup actions on multi-core     shared buffers. A local attacker could possibly use this to expose sensitive information. (CVE-2022-21123,     CVE-2022-21127)

    Alysa Milburn, Jason Brandt, Avishai Redelman and Nir Lavi discovered that some Intel processors     improperly optimised security-critical code. A local attacker could possibly use this to expose sensitive     information. (CVE-2022-21151)

    It was discovered that some Intel processors did not properly perform cleanup during specific special     register write operations. A local attacker could possibly use this to expose sensitive information.
    (CVE-2022-21166)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 ESM host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5535-1 advisory.

    Joseph Nuzman discovered that some Intel processors did not properly initialise shared resources. A local     attacker could use this to obtain sensitive information. (CVE-2021-0145)

    Mark Ermolov, Dmitry Sklyarov and Maxim Goryachy discovered that some Intel processors did not prevent     test and debug logic from being activated at runtime. A local attacker could use this to escalate     privileges. (CVE-2021-0146)

    It was discovered that some Intel processors did not implement sufficient control flow management. A local     attacker could use this to cause a denial of service (system crash). (CVE-2021-0127)

    It was discovered that some Intel processors did not completely perform cleanup actions on multi-core     shared buffers. A local attacker could possibly use this to expose sensitive information. (CVE-2022-21123,     CVE-2022-21127)

    It was discovered that some Intel processors did not completely perform cleanup actions on     microarchitectural fill buffers. A local attacker could possibly use this to expose sensitive information.
    (CVE-2022-21125)

    Alysa Milburn, Jason Brandt, Avishai Redelman and Nir Lavi discovered that some Intel processors     improperly optimised security-critical code. A local attacker could possibly use this to expose sensitive     information. (CVE-2022-21151)

    It was discovered that some Intel processors did not properly perform cleanup during specific special     register write operations. A local attacker could possibly use this to expose sensitive information.
    (CVE-2022-21166)

    It was discovered that some Intel processors did not properly restrict access in some situations. A local     attacker could use this to obtain sensitive information. (CVE-2021-33117)

    Brandon Miller discovered that some Intel processors did not properly restrict access in some situations.
    A local attacker could use this to obtain sensitive information or a remote attacker could use this to     cause a denial of service (system crash). (CVE-2021-33120)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Improper access control for some 3rd Generation Intel(R) Xeon(R) Scalable Processors before BIOS version     MR7, may allow a local attacker to potentially enable information disclosure via local access.
    (CVE-2021-33117)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of microcode_ctl installed on the remote host is prior to 2.1-47. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2022-1762 advisory.

    2024-05-09: CVE-2021-33117 was added to this advisory.

    A flaw was found in microcode. Under complex microarchitectural conditions, an unexpected code breakpoint     may cause a system hang. The hang was observed on a Skylake server processor, and subsequent analysis     indicated additional potentially affected processors. This flaw allows a possible temporary denial of     service (TDOS) to occur. (CVE-2021-0127)

    Hardware allows activation of test and debug logic at runtime for some Intel(R) processors which may allow     an unauthenticated user to potentially enable escalation of privilege via physical access. (CVE-2021-0146)

    Improper access control for some 3rd Generation Intel(R) Xeon(R) Scalable Processors before BIOS version     MR7, may allow a local attacker to potentially enable information disclosure via local access.
    (CVE-2021-33117)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-055 advisory.

    2024-06-06: CVE-2021-33117 was added to this advisory.

    Improper access control for some 3rd Generation Intel(R) Xeon(R) Scalable Processors before BIOS version     MR7, may allow a local attacker to potentially enable information disclosure via local access.
    (CVE-2021-33117)

    add (CVE-2022-0005)

    A flaw was found in hw. Improper access control for some Intel(R) Xeon(R) processors may potentially allow     an authenticated user to enable information disclosure via local access. (CVE-2022-21131)

    A flaw was found in hw. Improper input validation for some Intel(R) Xeon(R) processors may allow a     privileged user to enable a denial of service via local access. (CVE-2022-21136)

    A flaw was found in hw. Processor optimization removal or modification of security-critical code for some     Intel(R) processors may potentially allow an authenticated user to enable information disclosure via local     access. (CVE-2022-21151)

    A flaw was found in hw. The APIC can operate in xAPIC mode (also known as a legacy mode), in which APIC     configuration registers are exposed through a memory-mapped I/O (MMIO) page. This flaw allows an attacker     who can execute code on a target CPU to query the APIC configuration page. When reading the APIC     configuration page with an unaligned read from the MMIO page, the registers may return stale data from     previous requests made by the same processor core to the same configuration page, leading to unauthorized     access. (CVE-2022-21233)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
162834	Amazon Linux AMI : microcode_ctl (ALAS-2022-1606)	Nessus	Amazon Linux Local Security Checks	7/8/2022	12/11/2024	medium
162404	Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS : Intel Microcode vulnerabilities (USN-5486-1)	Nessus	Ubuntu Local Security Checks	6/20/2022	8/29/2024	medium
163520	Ubuntu 16.04 ESM : Intel Microcode vulnerabilities (USN-5535-1)	Nessus	Ubuntu Local Security Checks	7/28/2022	8/28/2024	medium
223888	Linux Distros Unpatched Vulnerability : CVE-2021-33117	Nessus	Misc.	3/5/2025	9/29/2025	medium
158724	Amazon Linux 2 : microcode_ctl (ALAS-2022-1762)	Nessus	Amazon Linux Local Security Checks	3/8/2022	12/11/2024	medium
173107	Amazon Linux 2023 : microcode_ctl (ALAS2023-2023-055)	Nessus	Amazon Linux Local Security Checks	3/21/2023	12/11/2024	medium

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