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ubuntucveUbuntu.comUB:CVE-2020-14309
HistoryJul 29, 2020 - 12:00 a.m.

CVE-2020-14309

2020-07-2900:00:00
ubuntu.com
ubuntu.com
6

6.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

4.6 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

0.001 Low

EPSS

Percentile

17.6%

JSON

There’s an issue with grub2 in all versions before 2.06 when handling
squashfs filesystems containing a symbolic link with name length of UINT32
bytes in size. The name size leads to an arithmetic overflow leading to a
zero-size allocation further causing a heap-based buffer overflow with
attacker controlled data.

Notes

Author Note
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
ubuntu18.04noarchgrub2-unsigned< 2.04-1ubuntu47.4UNKNOWN
ubuntu20.04noarchgrub2-unsigned< 2.04-1ubuntu47.4UNKNOWN
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6.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

4.6 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

0.001 Low

EPSS

Percentile

17.6%

JSON
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