CVE-2016-8649
First published: Wed Nov 23 2016(Updated: )
<a href="https://access.redhat.com/security/cve/CVE-2016-8649">CVE-2016-8649</a> was assigned to the issue that allows an attacker inside of an unprivileged container to use an inherited file descriptor, of the host's /proc, to access the rest of the host's filesystem via the openat() family of syscalls. The file descriptor is needed to write to /proc/<PID>/attr/current or /proc/<PID>/attr/exec to set the AppArmor/SELinux label of the attached process. Upstream bug: <a href="https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1639345">https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1639345</a> Upstream patch: <a href="https://github.com/lxc/lxc/commit/81f466d05f2a89cb4f122ef7f593ff3f279b165c">https://github.com/lxc/lxc/commit/81f466d05f2a89cb4f122ef7f593ff3f279b165c</a> References: <a href="http://seclists.org/oss-sec/2016/q4/515">http://seclists.org/oss-sec/2016/q4/515</a>
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/lxc | <=1:1.0.6-6+deb8u4<=1:2.0.5-3<=1:1.0.6-6+deb8u3 | 1:2.0.6-1 1:1.0.6-6+deb8u5 |
| Linuxcontainers Lxc | <1.0.9 | |
| Linuxcontainers Lxc | >=2.0.0<2.0.6 | |
| debian/lxc | 1:4.0.6-2+deb11u2 1:5.0.2-1+deb12u2 1:6.0.1-1 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2016-8649
- https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1639345
- https://github.com/lxc/lxc/commit/81f466d05f2a89cb4f122ef7f593ff3f279b165c
- http://seclists.org/oss-sec/2016/q4/515
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1398243
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1398245
- https://bugzilla.redhat.com/show_bug.cgi?id=1398242
- https://security-tracker.debian.org/tracker/CVE-2016-8649
- https://launchpad.net/bugs/1639345
- http://www.openwall.com/lists/oss-security/2016/11/23/6
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=845465
- http://www.securityfocus.com/bid/94498
Frequently Asked Questions
What is the severity of CVE-2016-8649?
CVE-2016-8649 is considered a high severity vulnerability due to its potential to allow attackers to access the host's filesystem.
How do I fix CVE-2016-8649?
To fix CVE-2016-8649, upgrade the lxc package to versions 1:2.0.6-1, 1:4.0.6-2+deb11u2, 1:5.0.2-1+deb12u2, or 1:6.0.1-1.
Which platforms are affected by CVE-2016-8649?
CVE-2016-8649 affects various versions of the lxc package on Debian and Linux Containers.
What is the impact of CVE-2016-8649 on system security?
CVE-2016-8649 compromises system security by enabling unprivileged containers to access sensitive files on the host.
Is there a workaround for CVE-2016-8649 if I cannot update?
A recommended workaround for CVE-2016-8649 is to limit access permissions for unprivileged containers until a fix can be applied.
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