#VU32531 Link following in libvirt - CVE-2013-6456

Vulnerability identifier: #VU32531

Vulnerability risk: Low

CVSSv4.0: 4.4 [CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2013-6456

CWE-ID: CWE-59

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
libvirt
Universal components / Libraries / Libraries used by multiple products

Vendor: libvirt.org

Description

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libvirt: 1.2.1

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External links
https://libvirt.org/git/?p=libvirt.git;a=commit;h=5fc590ad9f4
https://libvirt.org/news.html
https://lists.fedoraproject.org/pipermail/package-announce/2014-February/129199.html
https://lists.opensuse.org/opensuse-updates/2014-05/msg00004.html
https://secunia.com/advisories/56187
https://secunia.com/advisories/56215
https://secunia.com/advisories/60895
https://security.gentoo.org/glsa/glsa-201412-04.xml
https://security.libvirt.org/2013/0018.html
https://www.securityfocus.com/bid/65743
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=732394
https://bugzilla.redhat.com/show_bug.cgi?id=1045643

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.