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.
NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.
|Base Score:||8.2||Base Metrics:||AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H|
|Access Vector:||Local network||Attack Complexity:||Low|
|Privileges Required:||High||User Interaction:||None|
|Integrity Impact:||High||Availability Impact:||High|
|Oracle Linux version 7 (grub2)||ELSA-2020-5782||2020-07-29|
|Oracle Linux version 7 (grub2)||ELSA-2020-5790||2020-07-29|
|Oracle Linux version 8 (grub2)||ELSA-2020-5786||2020-07-29|
This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team