Gentoo: GLSA-201312-07 Critical: Sudo Escalation Security Risk
gentoo
May 30, 2017
A vulnerability in sudo allows local users to gain root privileges.
Summary
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.
Topics Covered
Resolution
All sudo users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-admin/sudo-1.8.20_p1"
References
[ 1 ] CVE-2017-1000367 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-1000367
Availability
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/201705-15
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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.
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Severity: High
Title: sudo: Privilege escalation
Date: May 30, 2017
Bugs: #620182
ID: 201705-15
Topics Covered
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.
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Affected Packages
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-admin/sudo < 1.8.20_p1 >= 1.8.20_p1
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.
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