#VU18154 NULL pointer dereference in libvirt - CVE-2019-3840

Vulnerability identifier: #VU18154

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-3840

CWE-ID: CWE-476

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 attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dreference error in libvirt in the way it processes interface information through the QEMU agent. An attacker in a guest VM can use this flaw to crash libvirtd and cause a denial of service (DoS).

Mitigation
Update to version 5.0.0.

Vulnerable software versions

libvirt: 0.2.0 - 4.10.0

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External links
https://libvirt.org/git/?p=libvirt.git&a=commitdiff&h=9ed175fbc2deecfdaeabca7bc77c7e7ae33a3377
https://libvirt.org/git/?p=libvirt.git&a=patch&h=9ed175fbc2deecfdaeabca7bc77c7e7ae33a3377

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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.