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FreeBSD : FreeBSD -- Memory disclosure by stale virtual memory mapping (13d37672-9791-11eb-b87a-901b0ef719ab)

medium Nessus Plugin ID 148511

Synopsis

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

Description

A particular case of memory sharing is mishandled in the virtual memory system. It is possible and legal to establish a relationship where multiple descendant processes share a mapping which shadows memory of an ancestor process. In this scenario, when one process modifies memory through such a mapping, the copy-on-write logic fails to invalidate other mappings of the source page. These stale mappings may remain even after the mapped pages have been reused for another purpose. Impact : An unprivileged local user process can maintain a mapping of a page after it is freed, allowing that process to read private data belonging to other processes or the kernel.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?e7ca164d

Plugin Details

Severity: Medium

ID: 148511

File Name: freebsd_pkg_13d37672979111ebb87a901b0ef719ab.nasl

Version: 1.3

Type: local

Published: 4/14/2021

Updated: 4/20/2021

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

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

CVSS Score Source: CVE-2021-29626

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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: 4/7/2021

Vulnerability Publication Date: 4/6/2021

Reference Information

CVE: CVE-2021-29626

FreeBSD: SA-21:08.vm