Vulnerability in Linuxcontainers Lxc
CVE-2018-6556
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.
EPSS: 0.003 (26.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Linuxcontainers Lxc
- Canonical Ubuntu_linux — versions 18.04
- Opensuse Leap — versions 15.0
- Suse Caas_platform — versions 1.0, 2.0
- Suse Openstack_cloud — versions 6
- Suse Suse_linux_enterprise_server — versions 11
- N/a Lxc — versions 2.0.9, 3.0.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@ubuntu.com (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
- security@ubuntu.com (x_refsource_CONFIRM, Third Party Advisory, Issue Tracking)
- security@ubuntu.com (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
- security@ubuntu.com (x_refsource_CONFIRM, Patch, Issue Tracking)
- security@ubuntu.com (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- security@ubuntu.com (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- security@ubuntu.com (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- security@ubuntu.com (vendor-advisory, x_refsource_SUSE)
Frequently asked questions
- What is CVE-2018-6556?
- CVE-2018-6556 is a low-severity vulnerability in Linuxcontainers Lxc, classified under CWE-417. CVSS score: 3.3/10. Published 2018-08-10.
- How severe is CVE-2018-6556?
- Low severity. CVSS v3 base score is 3.3 out of 10.
- Is CVE-2018-6556 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.