CVE-2021-33285

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.

• CWE-787
• CWE-20

• http://www.openwall.com/lists/oss-security/2021/08/30/1Mailing List, Third Party Advisory
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988386Issue Tracking, Mailing List, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2001608Issue Tracking, Third Party Advisory
• https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jpThird Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/11/msg00013.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/766ISTT3KCARKFUIQT7N6WV6T63XOKG3/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HSEKTKHO5HFZHWZNJNBJZA56472KRUZI/
• https://security.gentoo.org/glsa/202301-01Third Party Advisory
• https://www.debian.org/security/2021/dsa-4971Third Party Advisory
• https://www.openwall.com/lists/oss-security/2021/08/30/1Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/08/30/1Mailing List, Third Party Advisory
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988386Issue Tracking, Mailing List, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2001608Issue Tracking, Third Party Advisory
• https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jpThird Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/11/msg00013.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/766ISTT3KCARKFUIQT7N6WV6T63XOKG3/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HSEKTKHO5HFZHWZNJNBJZA56472KRUZI/
• https://security.gentoo.org/glsa/202301-01Third Party Advisory
• https://www.debian.org/security/2021/dsa-4971Third Party Advisory
• https://www.openwall.com/lists/oss-security/2021/08/30/1Mailing List, Third Party Advisory

Published

Sep 7, 2021

Last Modified

Jun 17, 2026

Status

Modified

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