Buffer overflow in Tuxera Ntfs-3g
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (33.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Tuxera Ntfs-3g
- Debian Linux — versions 9.0, 10.0, 11.0
- Fedoraproject Fedora — versions 33, 34, 35
- Red Hat Enterprise Linux — versions 7.0, 8.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.openwall.com/lists/oss-security/2021/08/30/1 (mailing-list, Mailing List, Third Party Advisory)
- github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jp (Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/08/30/1 (Mailing List, Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- bugs.debian.org/cgi-bin/bugreport.cgi (Mailing List, Third Party Advisory, Issue Tracking)
- www.debian.org/security/2021/dsa-4971 (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.debian.org/debian-lts-announce/2021/11/msg00013.html (mailing-list, Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202301-01 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-33285?
- CVE-2021-33285 is a high-severity vulnerability in Tuxera Ntfs-3g, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2021-09-07.
- How severe is CVE-2021-33285?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-33285 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.