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FreeBSD : FreeBSD -- Uninitialized kernel stack leaks in several file systems (a9c6e9be-61fb-11eb-b87a-901b0ef719ab)

medium Nessus Plugin ID 145563

Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

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. This problem is not present in FreeBSD 11.

Additionally, msdosfs(5) was failing to zero-fill a pair of padding fields in the dirent structure, resulting in a leak of three uninitialized bytes. Impact : Kernel stack disclosures may leak sensitive information which could be used to compromise the security of the system.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?a1aad08b

Plugin Details

Severity: Medium

ID: 145563

File Name: freebsd_pkg_a9c6e9be61fb11ebb87a901b0ef719ab.nasl

Version: 1.3

Type: local

Published: 1/29/2021

Updated: 4/6/2021

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2020-25579

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:freebsd, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Settings/ParanoidReport, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 1/29/2021

Vulnerability Publication Date: 1/29/2021

Reference Information

CVE: CVE-2020-25578, CVE-2020-25579

FreeBSD: SA-21:01.fsdisclosure