Vulnerability in GRUB 2 Affects Various Linux Distributions
CVE-2020-10713

8.2HIGH

Key Information:

Vendor
Gnu
Status
Grub
Vendor
CVE Published:
30 July 2020

Badges

👾 Exploit Exists🟡 Public PoC

Summary

A vulnerability in GRUB 2, prior to version 2.06, allows an attacker to hijack the boot verification process and bypass Secure Boot protections. To exploit this flaw, an attacker must gain physical access, alter PXE-boot networks, or have remote root access to a networked system. Once access is established, a malicious payload can be crafted to trigger a buffer overflow in GRUB, leading to arbitrary code execution. The primary risks involve threats to data confidentiality, integrity, and system availability.

Affected Version(s)

Grub All grub2 versions before 2.06

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

BootHole
Created by eclypsium

References

https://www.debian.org/security/2020/dsa-4735
vendor-advisoryx_refsource_DEBIAN
http://www.openwall.com/lists/oss-security/2020/07/29/3
mailing-listx_refsource_MLIST
https://bugzilla.redhat.com/show_bug.cgi?id=1825243
x_refsource_MISC

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability Reserved

.