SB2014052601 - Link following in libvirt (Alpine package)

Description

This security bulletin contains information about 1 security vulnerability.

1) Link following (CVE-ID: CVE-2013-6456)

The vulnerability allows a remote #AU# to damange or delete data.

The LXC driver (lxc/lxc_driver.c) in libvirt 1.0.1 through 1.2.1 allows local users to (1) delete arbitrary host devices via the virDomainDeviceDettach API and a symlink attack on /dev in the container; (2) create arbitrary nodes (mknod) via the virDomainDeviceAttach API and a symlink attack on /dev in the container; and cause a denial of service (shutdown or reboot host OS) via the (3) virDomainShutdown or (4) virDomainReboot API and a symlink attack on /dev/initctl in the container, related to "paths under /proc/$PID/root" and the virInitctlSetRunLevel function.

Remediation

Install update from vendor's website.

References

• https://git.alpinelinux.org/aports/commit/?id=0cfa1ecb03e0d2edca62c8cd9b391a8dd3535f9e
• https://git.alpinelinux.org/aports/commit/?id=d8714a39602de5077ab45918f69d5f43d26fd9c4