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CVE-2020-27749

CVE-2020-27749

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. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS 7.5 · High · EPSS 0.6% · 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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