Linux VServer Project ProcFS Weak Sharing Permissions Vulnerability

BID:10660

Info

Linux VServer Project ProcFS Weak Sharing Permissions Vulnerability

Bugtraq ID: 10660
Class: Access Validation Error
CVE:
Remote: No
Local: Yes
Published: Jul 05 2004 12:00AM
Updated: Jul 05 2004 12:00AM
Credit: Discovery of this vulnerability is credited to Veit Wahlich <[email protected]>.
Vulnerable: VServer Linux-VServer 1.27
VServer Linux-VServer 1.26
VServer Linux-VServer 1.25
VServer Linux-VServer 1.24
VServer Linux-VServer 1.23
VServer Linux-VServer 1.22
VServer Linux-VServer 1.21
VServer Linux-VServer 1.20
VServer Linux-VServer 1.9.1
VServer Linux-VServer 1.3.9
Gentoo Linux 1.4
Gentoo Linux 1.2
Not Vulnerable:

Discussion

Linux VServer Project ProcFS Weak Sharing Permissions Vulnerability

It is reported that VServer may be used in order to disclose memory contents and to deny service to the host operating system and other virtual servers. The vulnerability exists due to weak sharing permissions on procfs mounted directories. It is reported that a user residing in a VServer may make changes to a procfs mounted directory any changes made will affect the host operating system and all VServers that exist.

An attacker may exploit this issue to disclose information or initiate a denial of service.

Exploit / POC

Linux VServer Project ProcFS Weak Sharing Permissions Vulnerability

There is no exploit required.

Solution / Fix

Linux VServer Project ProcFS Weak Sharing Permissions Vulnerability

Solution:
Gentoo has released advisory GLSA 200407-16 dealing with this and other issues. They have advised that users should upgrade to the latest available sources for their system:

# emerge sync

# emerge -pv your-favorite-sources
# emerge your-favorite-sources

# # Follow usual procedure for compiling and installing a kernel.
# # If you use genkernel, run genkernel as you would do normally.

For more information please see the referenced Gentoo advisory.

The vendor has released an update, which includes a tool to provide for proc security:


VServer Linux-VServer 1.20

VServer Linux-VServer 1.21

VServer Linux-VServer 1.22

VServer Linux-VServer 1.23

VServer Linux-VServer 1.24

VServer Linux-VServer 1.25

VServer Linux-VServer 1.26

VServer Linux-VServer 1.27

References

Linux VServer Project ProcFS Weak Sharing Permissions Vulnerability

References:

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