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CVE-2021-33285

Date: September 6, 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.

Severity Score

Related Resources (17)

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/766ISTT3KCARKFUIQT7N6WV6T63XOKG3/
https://bugzilla.redhat.com/show_bug.cgi?id=2001608
https://nvd.nist.gov/vuln/detail/CVE-2021-33285
https://www.debian.org/security/2021/dsa-4971
https://access.redhat.com/security/cve/CVE-2021-33285
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-33285
https://www.openwall.com/lists/oss-security/2021/08/30/1
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/766ISTT3KCARKFUIQT7N6WV6T63XOKG3/
https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jp
https://security-tracker.debian.org/tracker/CVE-2021-33285
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988386
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HSEKTKHO5HFZHWZNJNBJZA56472KRUZI/
http://www.openwall.com/lists/oss-security/2021/08/30/1
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HSEKTKHO5HFZHWZNJNBJZA56472KRUZI/
https://lists.debian.org/debian-lts-announce/2021/11/msg00013.html
https://security.gentoo.org/glsa/202301-01
https://www.mend.io/vulnerability-database/CVE-2021-33285

Severity Score

Weakness Type (CWE)

Out-of-bounds Read

CWE-125

Out-of-bounds Write

CWE-787

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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