Linux VServer Project CHRoot Breakout Vulnerability

BID:9596

Info

Linux VServer Project CHRoot Breakout Vulnerability

Bugtraq ID: 9596
Class: Failure to Handle Exceptional Conditions
CVE: CVE-2005-4347
CVE-2004-2073
Remote: No
Local: Yes
Published: Feb 06 2004 12:00AM
Updated: Jul 05 2016 10:21PM
Credit: Discovery of this issue has been credited to Markus M?ller <[email protected]>.
Vulnerable: 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
Debian Linux 3.1 sparc
Debian Linux 3.1 s/390
Debian Linux 3.1 ppc
Debian Linux 3.1 mipsel
Debian Linux 3.1 mips
Debian Linux 3.1 m68k
Debian Linux 3.1 ia-64
Debian Linux 3.1 ia-32
Debian Linux 3.1 hppa
Debian Linux 3.1 arm
Debian Linux 3.1 amd64
Debian Linux 3.1 alpha
Debian Linux 3.1
Not Vulnerable: VServer Linux-VServer 1.25

Discussion

Linux VServer Project CHRoot Breakout Vulnerability

VServer is reported prone to a breakout vulnerability that allows a malicious user to escape from the context of the chrooted root directory of the virtual server. This issue is due to the VServer application failing to secure itself against a "chroot-again" style vulnerability. Successful exploitation of this issue may allow an attacker to gain access to the filesystem outside of the chrooted root directory.

Exploit / POC

Linux VServer Project CHRoot Breakout Vulnerability

The following exploit has been provided:

Solution / Fix

Linux VServer Project CHRoot Breakout Vulnerability

Solution:
The vendor has released an upgrade dealing with this issue.

Debian GNU/Linux has discovered that their original patches to address this issue were incomplete. Debian has released an advisory and fixes to properly address this issue in the util-vserver package and in the Linux kernel version 2.4 vserver patch. Please see the referenced advisory and Debian bug references for more information.


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

References

Linux VServer Project CHRoot Breakout Vulnerability

References:
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