GLSA 201705-15: sudo: Privilege escalation
Severity: | high |
Title: | sudo: Privilege escalation |
Date: | 05/30/2017 |
Bugs: |
|
ID: | 201705-15 |
Synopsis
A vulnerability in sudo allows local users to gain root privileges.Background
sudo (su “do”) allows a system administrator to delegate authority to give certain users (or groups of users) the ability to run some (or all) commands as root or another user while providing an audit trail of the commands and their arguments.
Affected packages
Package | Vulnerable | Unaffected | Architecture(s) |
---|---|---|---|
app-admin/sudo | < 1.8.20_p1 | >= 1.8.20_p1 | All supported architectures |
Description
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.
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.
Resolution
All sudo users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=app-admin/sudo-1.8.20_p1"
References
Availability
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
Concerns?
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
License
Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.