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FreeBSD : FreeBSD -- Cross-mount links between nullfs(5) mounts (b72bad1c-20ed-11e3-be06-000c29ee3065)

low Nessus Plugin ID 70263

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Synopsis

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

Description

Problem Description :

The nullfs(5) implementation of the VOP_LINK(9) VFS operation does not check whether the source and target of the link are both in the same nullfs instance. It is therefore possible to create a hardlink from a location in one nullfs instance to a file in another, as long as the underlying (source) filesystem is the same.

Impact :

If multiple nullfs views into the same filesystem are mounted in different locations, a user with read access to one of these views and write access to another will be able to create a hard link from the latter to a file in the former, even though they are, from the user's perspective, different filesystems. The user may thereby gain write access to files which are nominally on a read-only filesystem.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?dee9af20

Plugin Details

Severity: Low

ID: 70263

File Name: freebsd_pkg_b72bad1c20ed11e3be06000c29ee3065.nasl

Version: 1.8

Type: local

Published: 10/2/2013

Updated: 1/6/2021

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.8

CVSS v2

Risk Factor: Low

Base Score: 3.7

Temporal Score: 2.7

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

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: 9/19/2013

Vulnerability Publication Date: 9/10/2013

Reference Information

CVE: CVE-2013-5710

BID: 62303

FreeBSD: SA-13:13.nullfs