CVE Vulnerabilities

CVE-2020-15707

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Published: Jul 29, 2020 | Modified: Sep 13, 2021
CVSS 3.x
6.4
MEDIUM
Source:
NVD
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
4.4 MEDIUM
AV:L/AC:M/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
5.7 MODERATE
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H
Ubuntu

Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not included in GRUB2 upstream), leading to a heap-based buffer overflow. These could be triggered by an extremely large number of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. This issue affects GRUB2 version 2.04 and prior versions.

Weakness

The program contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

Affected Software

Name Vendor Start Version End Version
Grub2 Gnu * 2.04
Red Hat Enterprise Linux 7 RedHat fwupdate-0:12-6.el7_8 *
Red Hat Enterprise Linux 7 RedHat grub2-1:2.02-0.86.el7_8 *
Red Hat Enterprise Linux 7 RedHat shim-0:15-7.el7_9 *
Red Hat Enterprise Linux 7 RedHat shim-signed-0:15-7.el7_8 *
Red Hat Enterprise Linux 7.3 Advanced Update Support RedHat grub2-1:2.02-0.86.el7 *
Red Hat Enterprise Linux 7.3 Advanced Update Support RedHat shim-0:15-8.el7 *
Red Hat Enterprise Linux 7.3 Advanced Update Support RedHat shim-signed-0:15-8.el7_3 *
Red Hat Enterprise Linux 7.3 Telco Extended Update Support RedHat grub2-1:2.02-0.86.el7 *
Red Hat Enterprise Linux 7.3 Telco Extended Update Support RedHat shim-0:15-8.el7 *
Red Hat Enterprise Linux 7.3 Telco Extended Update Support RedHat shim-signed-0:15-8.el7_3 *
Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions RedHat grub2-1:2.02-0.86.el7 *
Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions RedHat shim-0:15-8.el7 *
Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions RedHat shim-signed-0:15-8.el7_3 *
Red Hat Enterprise Linux 7.4 Advanced Update Support RedHat fwupdate-0:9-10.el7_4 *
Red Hat Enterprise Linux 7.4 Advanced Update Support RedHat grub2-1:2.02-0.86.el7_4 *
Red Hat Enterprise Linux 7.4 Advanced Update Support RedHat shim-0:15-8.el7 *
Red Hat Enterprise Linux 7.4 Advanced Update Support RedHat shim-signed-0:15-8.el7_4 *
Red Hat Enterprise Linux 7.4 Telco Extended Update Support RedHat fwupdate-0:9-10.el7_4 *
Red Hat Enterprise Linux 7.4 Telco Extended Update Support RedHat grub2-1:2.02-0.86.el7_4 *
Red Hat Enterprise Linux 7.4 Telco Extended Update Support RedHat shim-0:15-8.el7 *
Red Hat Enterprise Linux 7.4 Telco Extended Update Support RedHat shim-signed-0:15-8.el7_4 *
Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions RedHat fwupdate-0:9-10.el7_4 *
Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions RedHat grub2-1:2.02-0.86.el7_4 *
Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions RedHat shim-0:15-8.el7 *
Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions RedHat shim-signed-0:15-8.el7_4 *
Red Hat Enterprise Linux 7.6 Extended Update Support RedHat fwupdate-0:12-6.el7_6 *
Red Hat Enterprise Linux 7.6 Extended Update Support RedHat grub2-1:2.02-0.86.el7_6 *
Red Hat Enterprise Linux 7.6 Extended Update Support RedHat shim-0:15-8.el7 *
Red Hat Enterprise Linux 7.6 Extended Update Support RedHat shim-signed-0:15-8.el7_6 *
Red Hat Enterprise Linux 7.7 Extended Update Support RedHat fwupdate-0:12-6.el7_7 *
Red Hat Enterprise Linux 7.7 Extended Update Support RedHat grub2-1:2.02-0.86.el7_7 *
Red Hat Enterprise Linux 7.7 Extended Update Support RedHat shim-0:15-8.el7 *
Red Hat Enterprise Linux 7.7 Extended Update Support RedHat shim-signed-0:15-8.el7_7 *
Red Hat Enterprise Linux 8 RedHat fwupd-0:1.1.4-7.el8_2 *
Red Hat Enterprise Linux 8 RedHat grub2-1:2.02-87.el8_2 *
Red Hat Enterprise Linux 8 RedHat shim-0:15-14.el8_2 *
Red Hat Enterprise Linux 8 RedHat shim-unsigned-x64-0:15-7.el8 *
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions RedHat fwupd-0:1.1.4-2.el8_0 *
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions RedHat grub2-1:2.02-87.el8_0 *
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions RedHat shim-0:15-14.el8_0 *
Red Hat Enterprise Linux 8.1 Extended Update Support RedHat fwupd-0:1.1.4-2.el8_1 *
Red Hat Enterprise Linux 8.1 Extended Update Support RedHat grub2-1:2.02-87.el8_1 *
Red Hat Enterprise Linux 8.1 Extended Update Support RedHat shim-0:15-14.el8_1 *
Red Hat Enterprise Linux 8.1 Extended Update Support RedHat shim-unsigned-x64-0:15-7.el8 *
Grub2 Ubuntu bionic *
Grub2 Ubuntu esm-infra/xenial *
Grub2 Ubuntu focal *
Grub2 Ubuntu precise/esm *
Grub2 Ubuntu trusty *
Grub2 Ubuntu trusty/esm *
Grub2 Ubuntu xenial *
Grub2-signed Ubuntu bionic *
Grub2-signed Ubuntu esm-infra/xenial *
Grub2-signed Ubuntu focal *
Grub2-signed Ubuntu trusty *
Grub2-signed Ubuntu trusty/esm *
Grub2-signed Ubuntu xenial *

Extended Description

This can have security implications when the expected synchronization is in security-critical code, such as recording whether a user is authenticated or modifying important state information that should not be influenced by an outsider. A race condition occurs within concurrent environments, and is effectively a property of a code sequence. Depending on the context, a code sequence may be in the form of a function call, a small number of instructions, a series of program invocations, etc. A race condition violates these properties, which are closely related:

A race condition exists when an “interfering code sequence” can still access the shared resource, violating exclusivity. Programmers may assume that certain code sequences execute too quickly to be affected by an interfering code sequence; when they are not, this violates atomicity. For example, the single “x++” statement may appear atomic at the code layer, but it is actually non-atomic at the instruction layer, since it involves a read (the original value of x), followed by a computation (x+1), followed by a write (save the result to x). The interfering code sequence could be “trusted” or “untrusted.” A trusted interfering code sequence occurs within the program; it cannot be modified by the attacker, and it can only be invoked indirectly. An untrusted interfering code sequence can be authored directly by the attacker, and typically it is external to the vulnerable program.

Potential Mitigations

  • Minimize the usage of shared resources in order to remove as much complexity as possible from the control flow and to reduce the likelihood of unexpected conditions occurring.
  • Additionally, this will minimize the amount of synchronization necessary and may even help to reduce the likelihood of a denial of service where an attacker may be able to repeatedly trigger a critical section (CWE-400).

References