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CVE-2018-6556

3.3 · LOW

lxc-user-nic when asked to delete a network interface will unconditionally open a user provided path.

Published Aug 10, 2018CWE-417EPSS 0.35%

Overview

CVE-2018-6556 is a low-severity vulnerability. It was published on August 10, 2018 and has a CVSS 3.0 base score of 3.3 (LOW).

This vulnerability has a CVSS 3.0 base score of 3.3, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

lxc-user-nic when asked to delete a network interface will unconditionally open a user provided path. This code path may be used by an unprivileged user to check for the existence of a path which they wouldn't otherwise be able to reach. It may also be used to trigger side effects by causing a (read-only) open of special kernel files (ptmx, proc, sys). Affected releases are LXC: 2.0 versions above and including 2.0.9; 3.0 versions above and including 3.0.0, prior to 3.0.2.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-security-announce/2019-04/msg00074.htmlReflists.opensuse.org/opensuse-security-announce/2019-04/msg00076.htmlReflists.opensuse.org/opensuse-security-announce/2019-04/msg00091.htmlReflists.opensuse.org/opensuse-security-announce/2019-05/msg00073.htmlRefbugs.launchpad.net/ubuntu/+source/lxc/+bug/1783591Refbugzilla.suse.com/show_bug.cgi?id=988348Refsecurity.gentoo.org/glsa/201808-02Refusn.ubuntu.com/usn/usn-3730-1Reflists.opensuse.org/opensuse-security-announce/2019-04/msg00074.htmlReflists.opensuse.org/opensuse-security-announce/2019-04/msg00076.html

How CyberStrike helps

Frequently asked questions

What is CVE-2018-6556?

CVE-2018-6556 is a low-severity vulnerability. It was published on August 10, 2018 and has a CVSS 3.0 base score of 3.3 (LOW).

How severe is CVE-2018-6556?

This vulnerability has a CVSS 3.0 base score of 3.3, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2018-6556?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-6556?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-6556 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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