Out-of-bounds Write Affecting shim-x64 package, versions <0:15-14.el8_2


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.07% (32nd percentile)

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  • Snyk IDSNYK-RHEL8-SHIMX64-1434532
  • published26 Jul 2021
  • disclosed29 Jul 2020

Introduced: 29 Jul 2020

CVE-2020-10713  (opens in a new tab)
CWE-787  (opens in a new tab)
CWE-78  (opens in a new tab)

How to fix?

Upgrade RHEL:8 shim-x64 to version 0:15-14.el8_2 or higher.
This issue was patched in RHSA-2020:3216.

NVD Description

Note: Versions mentioned in the description apply only to the upstream shim-x64 package and not the shim-x64 package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper the GRUB verification process. This flaw also allows the bypass of Secure Boot protections. In order to load an untrusted or modified kernel, an attacker would first need to establish access to the system such as gaining physical access, obtain the ability to alter a pxe-boot network, or have remote access to a networked system with root access. With this access, an attacker could then craft a string to cause a buffer overflow by injecting a malicious payload that leads to arbitrary code execution within GRUB. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS Scores

version 3.1