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CVE-2021-33285

Published: 7 September 2021

In NTFS-3G versions < 2021.8.22, when a specially crafted NTFS attribute is supplied to the function ntfs_get_attribute_value, a heap buffer overflow can occur allowing for memory disclosure or denial of service. The vulnerability is caused by an out-of-bound buffer access which can be triggered by mounting a crafted ntfs partition. The root cause is a missing consistency check after reading an MFT record : the "bytes_in_use" field should be less than the "bytes_allocated" field. When it is not, the parsing of the records proceeds into the wild.

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
ntfs-3g
Launchpad, Ubuntu, Debian
upstream Needs triage

impish
Released (1:2017.3.23AR.3-3ubuntu5)
jammy
Released (1:2017.3.23AR.3-3ubuntu5)
bionic
Released (1:2017.3.23-2ubuntu0.18.04.3)
focal
Released (1:2017.3.23AR.3-3ubuntu1.1)
hirsute
Released (1:2017.3.23AR.3-3ubuntu4.1)
trusty
Released (1:2013.1.13AR.1-2ubuntu2+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
xenial
Released (1:2015.3.14AR.1-1ubuntu0.3+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H