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CVE-2020-27779

CVE-2020-27779

This page contains facts from public vulnerability sources. Check the original advisory before updating.

A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS 7.5 · High · EPSS 0.4% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • grub2

    Versions
    • grub 2.06: Affected

    No fix published

  • grub2 Debian:12

    Affected ranges
    • ECOSYSTEM: < 2.04-16

    Update to 2.04-16

  • grub2 Debian:13

    Affected ranges
    • ECOSYSTEM: < 2.04-16

    Update to 2.04-16

  • grub2 Debian:14

    Affected ranges
    • ECOSYSTEM: < 2.04-16

    Update to 2.04-16

  • grub2-signed Ubuntu:Pro:14.04:LTS

    Versions
    • 1.22
    • 1.23
    • 1.24
    • 1.25
    • 1.26
    • 1.27
    • 1.30
    • 1.31
    • 1.32
    • 1.33
    • 1.34
    • 1.34.1
    • 1.34.2
    • 1.34.3
    • 1.34.4
    • 1.34.5
    • 1.34.6
    • 1.34.7
    • 1.34.8
    • 1.34.9
    • 1.34.13
    • 1.34.14
    • 1.34.16
    • 1.34.17
    • 1.34.18
    • 1.34.20
    • 1.34.22
    • 1.34.24
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • grub2-signed Ubuntu:18.04:LTS

    Versions
    • 1.85
    • 1.86
    • 1.87
    • 1.89
    • 1.91
    • 1.92
    • 1.93
    • 1.93.1
    • 1.93.2
    • 1.93.3
    • 1.93.4
    • 1.93.5
    • 1.93.7
    • 1.93.8
    • 1.93.10
    • 1.93.11
    • 1.93.13
    • 1.93.14
    • 1.93.15
    • 1.93.16
    • 1.93.18
    • 1.93.19
    • 1.93.20
    • 1.93.21
    • 1.93.22
    • 1.93.24
    • 1.167~18.04.1
    • 1.167~18.04.3
    Affected ranges
    • ECOSYSTEM: < 1.167~18.04.5

    Update to 1.167~18.04.5

  • grub2-unsigned Ubuntu:18.04:LTS

    Versions
    • 2.04-1ubuntu44
    • 2.04-1ubuntu44.1
    Affected ranges
    • ECOSYSTEM: < 2.04-1ubuntu44.1.2

    Update to 2.04-1ubuntu44.1.2

  • grub2-signed Ubuntu:20.04:LTS

    Versions
    • 1.128
    • 1.129
    • 1.130
    • 1.131
    • 1.133
    • 1.134
    • 1.135
    • 1.136
    • 1.137
    • 1.138
    • 1.139
    • 1.140
    • 1.141
    • 1.142
    • 1.142.1
    • 1.142.3
    • 1.142.4
    • 1.142.5
    • 1.142.6
    • 1.142.8
    • 1.142.9
    • 1.142.10
    • 1.142.11
    • 1.167
    Affected ranges
    • ECOSYSTEM: < 1.167.2

    Update to 1.167.2

  • grub2-unsigned Ubuntu:20.04:LTS

    Versions
    • 2.04-1ubuntu44
    Affected ranges
    • ECOSYSTEM: < 2.04-1ubuntu44.2

    Update to 2.04-1ubuntu44.2

Original sources

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