PT-2021-11155 · Freebsd · Freebsd

Published 2021-01-29 · Updated 2021-06-03 · CVE-2020-25578

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions: FreeBSD versions 12.2-STABLE before r368969 FreeBSD versions 11.4-STABLE before r369047 FreeBSD versions 12.2-RELEASE before p3 FreeBSD versions 12.1-RELEASE before p13 FreeBSD versions 11.4-RELEASE before p7

Description: The issue affects several file systems in FreeBSD, including tmpfs(5), smbfs(5), autofs(5), and mqueuefs(5), which were not properly initializing the d off field of the dirent structures returned by VOP READDIR. This results in the potential leak of eight uninitialized kernel stack bytes to userspace.

Recommendations: For FreeBSD versions 12.2-STABLE before r368969, update to a version after r368969. For FreeBSD versions 11.4-STABLE before r369047, update to a version after r369047. For FreeBSD versions 12.2-RELEASE before p3, update to a version after p3. For FreeBSD versions 12.1-RELEASE before p13, update to a version after p13. For FreeBSD versions 11.4-RELEASE before p7, update to a version after p7.

Exploit

Fix

Improper Initialization

Weakness Enumeration

CWE-665

Related Identifiers

CVE-2020-25578

FREEBSD-SA-21_01

Affected Products

Freebsd

References · 9

• 🔥 https://github.com/farazsth98/freebsd-dirent-info-leak-bugs · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2020-25578 · Security Note
• https://security.freebsd.org/advisories/FreeBSD-SA-21:01.fsdisclosure.asc · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-25578 · Vendor Advisory
• https://t.me/cybersecuritytechnologies/2603 · Telegram Post
• https://security.netapp.com/advisory/ntap-20210423-0002 · Note
• https://t.me/cvenotify/12128 · Telegram Post
• https://t.me/cvenotify/13571 · Telegram Post
• https://freebsd.org/security/advisories/FreeBSD-SA-21:01.fsdisclosure.asc · Note