CVE-2021-33285

moderate-risk

Published 2021-09-07

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.

Do I need to act?

0.04% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.8/10 High

LOCAL / LOW complexity

Affected Products (10)

Ntfs-3G

Enterprise Linux

Fedora

Debian Linux

Affected Vendors

Debian Redhat Fedoraproject Tuxera

References (20)

Mailing List http://www.openwall.com/lists/oss-security/2021/08/30/1

Issue Tracking https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988386

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2001608

Third Party Advisory https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jp

Mailing List https://lists.debian.org/debian-lts-announce/2021/11/msg00013.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

Third Party Advisory https://security.gentoo.org/glsa/202301-01

Third Party Advisory https://www.debian.org/security/2021/dsa-4971

Mailing List https://www.openwall.com/lists/oss-security/2021/08/30/1