Improper Authentication in libvirt - CVE-2016-5008
Published: August 5, 2020
Vulnerability identifier: #VU33986
CSH Severity: Medium
CVSS v4: 7.4 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2016-5008
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error in when processing authentication requests. libvirt before 2.0.0 improperly disables password checking when the password on a VNC server is set to an empty string, which allows remote attackers to bypass authentication and establish a VNC session by connecting to the server.
Affected software
libvirt
libvirt (Alpine package)
libvirt
Fedora
libvirt (Alpine package)
libvirt
Fedora
How to mitigate CVE-2016-5008
Install updates from vendor's website.
libvirt - update to 2.0.0
libvirt (Alpine package) - update to 1.2.11-r2
libvirt - addressed in versions 1.2.18.4-1.fc23, 1.3.3.2-1.fc24
libvirt (Alpine package) - update to 1.2.11-r2
libvirt - addressed in versions 1.2.18.4-1.fc23, 1.3.3.2-1.fc24
External References
- http://lists.opensuse.org/opensuse-updates/2016-07/msg00054.html
- http://lists.opensuse.org/opensuse-updates/2016-07/msg00055.html
- http://lists.opensuse.org/opensuse-updates/2016-08/msg00024.html
- http://rhn.redhat.com/errata/RHSA-2016-2577.html
- http://security.libvirt.org/2016/0001.html
- http://www.debian.org/security/2016/dsa-3613
- http://www.securityfocus.com/bid/91562
- https://bugzilla.redhat.com/show_bug.cgi?id=1180092
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DZZMOMRXNPALA34XDF5NK363KDLAYSTL/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QTQF6LXKEEMJG4VOOCIAPJAD6ACBYP4W/
- https://usn.ubuntu.com/3576-1/