Detections
Analytics

FreeBSD : sudo -- Potential bypass of Runas user restrictions (3a1474ba-f646-11e9-b0af-b888e347c638)

high Nessus Plugin ID 130239

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Synopsis

The remote FreeBSD host is missing a security-related update.

Description

Todd C. Miller reports :

When sudo is configured to allow a user to run commands as an arbitrary user via the ALL keyword in a Runas specification, it is possible to run commands as root by specifying the user ID -1 or 4294967295.

This can be used by a user with sufficient sudo privileges to run commands as root even if the Runas specification explicitly disallows root access as long as the ALL keyword is listed first in the Runas specification.

Log entries for commands run this way will list the target user as 4294967295 instead of root. In addition, PAM session modules will not be run for the command.

Solution

Update the affected package.

See Also

https://www.sudo.ws/alerts/minus_1_uid.html

http://www.nessus.org/u?b7e71c95

Plugin Details

Severity: High

ID: 130239

File Name: freebsd_pkg_3a1474baf64611e9b0afb888e347c638.nasl

Version: 1.5

Type: local

Published: 10/25/2019

Updated: 1/23/2023

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7.4

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

CVSS Score Source: CVE-2019-14287

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 8.2

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

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

Vulnerability Information

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

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/24/2019

Vulnerability Publication Date: 10/15/2019

Exploitable With

Core Impact

Reference Information

CVE: CVE-2019-14287