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.

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)

EPSS: 0.023 (81.6th percentile) — read the EPSS interpretation.

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.

Affected products

Freebsd — versions 11.4, 12.1, 12.2
N/a Freebsd — versions FreeBSD 12.2-RELEASE before p3, 12.1-RELEASE before p13, 11.4-RELEASE before p7

Weakness classification (CWE)

CWE-665 — Improper Initialization

Public proof-of-concept exploits

References

secteam@freebsd.org (x_refsource_MISC, Vendor Advisory)
secteam@freebsd.org (x_refsource_CONFIRM, 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.