| Name | CVE-2018-6556 |
| 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 905586 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| lxc (PTS) | jessie, jessie (lts) | 1:1.0.6-6+deb8u6 | fixed |
| stretch | 1:2.0.7-2+deb9u2 | fixed | |
| buster (security), buster, buster (lts) | 1:3.1.0+really3.0.3-8+deb10u1 | fixed | |
| bullseye | 1:4.0.6-2+deb11u2 | fixed | |
| bookworm | 1:5.0.2-1+deb12u2 | fixed | |
| sid, trixie | 1:6.0.2-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| lxc | source | wheezy | (unfixed) | end-of-life | ||
| lxc | source | jessie | (not affected) | |||
| lxc | source | stretch | (not affected) | |||
| lxc | source | (unstable) | 1:2.0.9-6.1 | 905586 |
[stretch] - lxc <not-affected> (Vulnerable code introduced later)
[jessie] - lxc <not-affected> (Vulnerable code introduced later)
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1783591
Prerequisite: https://github.com/lxc/lxc/commit/f96f5f3c1341e73ee51c8b49bef4ba571c562d8c
Fixed by: https://github.com/lxc/lxc/commit/5eb45428b312e978fb9e294dde16efb14dd9fa4d