Vulnerability identifier: #VU14510

Vulnerability risk: Low

CVSSv3.1: 3.5 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-6556

CWE-ID: CWE-200

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
LXS
Client/Desktop applications / Virtualization software

Vendor: Linux Containers

Description
The vulnerability allows a local unauthenticated attacker to obtain potentially sensitive information on the target system.

The weakness exists due to lxc-user-nic unconditionally opens a user provided path when asked to delete a network interface. A local attacker can check for the existence of a path which he wouldn't otherwise be able to reach and trigger side effects by causing a (read-only) open of special kernel files (ptmx, proc, sys).

Mitigation
Update to version 3.0.2.

Vulnerable software versions

LXS: 2.0.0 - 3.0.1

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External links
http://bugzilla.suse.com/show_bug.cgi?id=988348

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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