Executive Summary

Summary
Title vzctl: Security bypass
Informations
Name GLSA-201701-30 First vendor Publication 2017-01-11
Vendor Gentoo Last vendor Modification 2017-01-11
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:N/I:P/A:P)
Cvss Base Score 3.6 Attack Range Local
Cvss Impact Score 4.9 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Synopsis

A vulnerability in vzctl might allow attackers to gain control over ploop containers.

Background

vzctl is a set of control tools for the OpenVZ server virtualization solution.

Description

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 users to 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.

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.

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

Original Source

Url : http://security.gentoo.org/glsa/glsa-201701-30.xml

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-59 Improper Link Resolution Before File Access ('Link Following')

Nessus® Vulnerability Scanner

Date Description
2017-01-12 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-201701-30.nasl - Type : ACT_GATHER_INFO
2015-09-14 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-3357.nasl - Type : ACT_GATHER_INFO

Alert History

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0
1
Date Informations
2017-01-13 13:24:47
  • Multiple Updates
2017-01-11 17:22:57
  • First insertion