Vulnerability in FreeBSD
CVE-2020-25578
In FreeBSD 12.2-STABLE before r368969, 11.4-STABLE before r369047, 12.2-RELEASE before p3, 12.1-RELEASE before p13 and 11.4-RELEASE before p7 several file systems were not properly initializing the d_off field of the dirent structures returned by VOP_READDIR. In particular, tmpfs(5), smbfs(5), autofs(5) and mqueuefs(5) were failing to do so. As a result, eight uninitialized kernel stack bytes may be leaked to userspace by these file systems.
Vulnerability class: Dirty Pipe (CVE-2022-0847)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.023 (82.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 82.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000
Affected products
- FreeBSD — versions 11.4, 12.1, 12.2
- FreeBSD — versions FreeBSD 12.2-RELEASE before p3, 12.1-RELEASE before p13, 11.4-RELEASE before p7
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security.FreeBSD.org/advisories/FreeBSD-SA-21:01.fsdisclosure.asc (Vendor Advisory)
- security.netapp.com/advisory/ntap-20210423-0002/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-25578?
- CVE-2020-25578 is a medium-severity vulnerability in FreeBSD, classified under Improper Initialization. CVSS score: 5.3/10. Published 2021-03-26.
- How severe is CVE-2020-25578?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2020-25578 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.