Slackware 14.2: SSA:2019-043-01 High: LXC Code Execution Risk

Here are the details from the Slackware 14.2 ChangeLog: patches/packages/lxc-2.0.9_d3a03247-i586-1_slack14.2.txz: Upgraded. This update fixes a security issue where a malicious privileged container could overwrite the host binary and thus gain root-level code execution on the host. As the LXC project considers privileged containers to be unsafe no CVE has been assigned for this issue for LXC. To prevent this attack, LXC has been patched to create a temporary copy of the calling binary itself when it starts or attaches to containers. To do this LXC creates an anonymous, in-memory file using the memfd_create() system call and copies itself into the temporary in-memory file, which is then sealed to prevent further modifications. LXC then executes this sealed, in-memory file instead of the original on-disk binary. For more information, see: https://seclists.org/oss-sec/2019/q1/119 (* Security fix *)