Improper access control in libvirt libvirt

1) Improper access control

EUVDB-ID: #VU32018

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-10166

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a local authenticated user to execute arbitrary code.

It was discovered that libvirtd, versions 4.x.x before 4.10.1 and 5.x.x before 5.4.1, would permit readonly clients to use the virDomainManagedSaveDefineXML() API, which would permit them to modify managed save state files. If a managed save had already been created by a privileged user, a local attacker could modify this file such that libvirtd would execute an arbitrary program when the domain was resumed.

Mitigation

Install update from vendor's website.

Vulnerable software versions

libvirt: 4.10.0 - 5.4.0

CPE2.3

• cpe:2.3:a:libvirt_org:libvirt:4.10.0:*:*:*:*:*:*:*
• cpe:2.3:a:libvirt_org:libvirt:5.4.0:*:*:*:*:*:*:*

External links

https://access.redhat.com/libvirt-privesc-vulnerabilities
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10166
https://security.gentoo.org/glsa/202003-18

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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