Security restrictions bypass in libvirt

1) Security restrictions bypass

EUVDB-ID: #VU10793

Risk: Low

CVSSv4.0: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-6764

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows an adjacent attacker to bypass security restrictions on the target system.

The weakness exists in the util/virlog.c source code file due to improper determination of hostnames during LXC container startup. An adjacent attacker can bypass security restrictions and execute arbitrary commands.

Mitigation

Update to version 4.0.0-2.

Vulnerable software versions

libvirt: 3.7.0 - 4.0.0

CPE2.3

• cpe:2.3:a:libvirt_org:libvirt:3.7.0:*:*:*:*:*:*:*
• cpe:2.3:a:libvirt_org:libvirt:3.8.0:*:*:*:*:*:*:*
• cpe:2.3:a:libvirt_org:libvirt:3.9.0:*:*:*:*:*:*:*

External links

https://libvirt.org/git/?p=libvirt.git;a=commit;h=759b4d1b0fe5f4d84d98b99153dfa7ac289dd167

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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