Improper access control in libvirt libvirt

1) Improper access control

EUVDB-ID: #VU32019

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-2019-10167

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

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

The virConnectGetDomainCapabilities() libvirt API, versions 4.x.x before 4.10.1 and 5.x.x before 5.4.1, accepts an "emulatorbin" argument to specify the program providing emulation for a domain. Since v1.2.19, libvirt will execute that program to probe the domain's capabilities. Read-only clients could specify an arbitrary path for this argument, causing libvirtd to execute a crafted executable with its own privileges.

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-2019-10167
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.