Gentoo: 201606-13 Moderate: Sudo Symlink Attack Risk and Resolution
gentoo
June 26, 2016
sudo is vulnerable to an escalation of privileges via a symlink attack.
Summary
sudoedit in sudo is vulnerable to the escalation of privileges by local users via a symlink attack. This can be exploited by a file whose full path is defined using multiple wildcards in /etc/sudoers, as demonstrated by "/home/*/*/file.txt.
Resolution
All sudo users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-admin/sudo-1.8.15-r1"
References
[ 1 ] CVE-2015-5602 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-5602
Availability
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/201606-13
style>.gentoo_availability{display:block;}
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: Normal
Title: sudo: Unauthorized privilege escalation in sudoedit
Date: June 26, 2016
Bugs: #564774
ID: 201606-13
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 < 1.8.15-r1 >= 1.8.15-r1
Impact
=====
Local users are able to gain unauthorized privileges on the system.
Workaround
There is no known work around at this time.
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