GLSA-201705-15 : sudo: Privilege escalation

medium Nessus Plugin ID 100523

Synopsis

The remote Gentoo host is missing one or more security-related patches.

Description

The remote host is affected by the vulnerability described in GLSA-201705-15 (sudo: Privilege escalation)

Qualys discovered a vulnerability in sudo’s get_process_ttyname() for Linux, that via sudo_ttyname_scan() can be directed to use a user-controlled, arbitrary tty device during its traversal of “/dev”
by utilizing the world-writable /dev/shm.
For further information, please see the Qualys Security Advisory Impact :

A local attacker can pretend that his tty is any character device on the filesystem, and after two race conditions, an attacker can pretend that the controlled tty is any file on the filesystem allowing for privilege escalation Workaround :

There is no known workaround at this time.

Solution

All sudo users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=app-admin/sudo-1.8.20_p1'

See Also

http://www.nessus.org/u?b66177f6

https://security.gentoo.org/glsa/201705-15

Plugin Details

Severity: Medium

ID: 100523

File Name: gentoo_GLSA-201705-15.nasl

Version: 3.12

Type: local

Published: 5/31/2017

Updated: 1/11/2021

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.9

Temporal Score: 5.4

Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C

Temporal Vector: E:POC/RL:OF/RC:C

CVSS v3

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5.8

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

Temporal Vector: E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:sudo, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/30/2017

Reference Information

CVE: CVE-2017-1000367

GLSA: 201705-15