Errata ALT-PU-2024-1877-3: Information
Fixes
Published: Jan. 25, 2024
BDU:2024-00725
Уязвимость UEFI-загрузчика shim, существующая из-за непринятия мер по нейтрализации специальных элементов, позволяющая нарушителю выполнить произвольный код
Severity: HIGH (8.3) Vector: AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
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Published: Jan. 29, 2024
Modified: April 29, 2024
Modified: April 29, 2024
CVE-2023-40546
A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create the new variable, it tries to print an error message to the user; however, the number of parameters used by the logging function doesn't match the format string used by it, leading to a crash under certain circumstances.
Severity: MEDIUM (5.5) Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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Published: Jan. 25, 2024
Modified: April 30, 2024
Modified: April 30, 2024
CVE-2023-40547
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.
Severity: HIGH (8.3) Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
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Published: Jan. 29, 2024
Modified: May 8, 2024
Modified: May 8, 2024
CVE-2023-40548
A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase.
Severity: HIGH (7.4) Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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Published: Jan. 29, 2024
Modified: April 29, 2024
Modified: April 29, 2024
CVE-2023-40549
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.
Severity: MEDIUM (5.5) Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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Published: Jan. 29, 2024
Modified: April 29, 2024
Modified: April 29, 2024
CVE-2023-40550
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.
Severity: MEDIUM (5.5) Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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Published: Jan. 29, 2024
Modified: April 29, 2024
Modified: April 29, 2024
CVE-2023-40551
A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or possible exposure of sensitive data during the system's boot phase.
Severity: MEDIUM (5.1) Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:H
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