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ubuntucveUbuntu.comUB:CVE-2020-15707
HistoryJul 29, 2020 - 12:00 a.m.

CVE-2020-15707

2020-07-2900:00:00
ubuntu.com
ubuntu.com
10

6.4 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

4.4 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:M/Au:N/C:P/I:P/A:P

0.001 Low

EPSS

Percentile

46.2%

JSON

Integer overflows were discovered in the functions grub_cmd_initrd and
grub_initrd_init in the efilinux component of GRUB2, as shipped in Debian,
Red Hat, and Ubuntu (the functionality is not included in GRUB2 upstream),
leading to a heap-based buffer overflow. These could be triggered by an
extremely large number of arguments to the initrd command on 32-bit
architectures, or a crafted filesystem with very large files on any
architecture. An attacker could use this to execute arbitrary code and
bypass UEFI Secure Boot restrictions. This issue affects GRUB2 version 2.04
and prior versions.

Notes

Author Note
sbeattie efilinux: Fix integer overflows in grub_cmd_initrd e961f8f8cdb25245900dc0884047e856346035b3 Title: grub2: integer overflows in efilinux grub_cmd_initrd and grub_initrd_init leads to heap based buffer overflow code is not upstream in grub2 but carried as part of patches by Ubuntu, Debian, Red Hat and possibly others.
alexmurray grub2-signed is not supported in Ubuntu 12.04 ESM (precise/esm) and so marking the priority for grub2 in this release as low
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchgrub2< 2.02-2ubuntu8.16UNKNOWN
ubuntu20.04noarchgrub2< 2.04-1ubuntu26.1UNKNOWN
ubuntu14.04noarchgrub2< 2.02~beta2-9ubuntu1.20) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu16.04noarchgrub2< 2.02~beta2-36ubuntu3.26UNKNOWN
ubuntu18.04noarchgrub2-signed< 1.93.18UNKNOWN
ubuntu20.04noarchgrub2-signed< 1.142.3UNKNOWN
ubuntu14.04noarchgrub2-signed< 1.34.22) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu16.04noarchgrub2-signed< 1.66.26UNKNOWN
ubuntu16.04noarchgrub2-unsigned< anyUNKNOWN

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6.4 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

4.4 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:M/Au:N/C:P/I:P/A:P

0.001 Low

EPSS

Percentile

46.2%

JSON
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