Gentoo GLSA 201701-30 Normal: Vzctl Bypass Threat on Ploop Containers
gentoo
January 11, 2017
A vulnerability in vzctl might allow attackers to gain control over ploop containers.
Summary
It was discovered that vzctl determined the virtual environment (VE) layout based on the presence of root.hdd/DiskDescriptor.xml in the VE private directory. This allows local simfs container (CT) root usersto change the root password for arbitrary ploop containers. This is demonstrated by a symlink attack on the ploop container root.hdd file which can then be used to access a control panel.
Topics Covered
Resolution
All vzctl users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-cluster/vzctl-4.9.4"
References
[ 1 ] CVE-2015-6927 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-6927
Availability
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/201701-30
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: vzctl: Security bypass
Date: January 11, 2017
Bugs: #560522
ID: 201701-30
Topics Covered
Background
vzctl is a set of control tools for the OpenVZ server virtualization
solution.
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Affected Packages
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-cluster/vzctl < 4.9.4 >= 4.9.4
Impact
=====
An attacker with root privileges, in a simfs-based container, could
gain control over ploop-based containers.
Workaround
There is no known workaround at this time.
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