Permissions, Privileges, and Access Controls in LXS

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU42039

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-6441

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The lxc-sshd template (templates/lxc-sshd.in) in LXC before 1.0.0.beta2 uses read-write permissions when mounting /sbin/init, which allows local users to gain privileges by modifying the init file.

Mitigation

Install update from vendor's website.

Vulnerable software versions

LXS: 0.1.0 - 0.8.0

CPE2.3

• cpe:2.3:a:linux_containers:lxc:0.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:linux_containers:lxc:0.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:linux_containers:lxc:0.2.1:*:*:*:*:*:*:*

External links

http://www.ubuntu.com/usn/USN-2104-1
http://bugs.launchpad.net/ubuntu/%2Bsource/lxc/%2Bbug/1261045
http://github.com/dotcloud/lxc/pull/1
http://github.com/lxc/lxc/commit/f4d5cc8e1f39d132b61e110674528cac727ae0e2

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.