#VU27545 Resource management error in libvirt - CVE-2019-20485

Vulnerability identifier: #VU27545

Vulnerability risk: Medium

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

CVE-ID: CVE-2019-20485

CWE-ID: CWE-399

Exploitation vector: 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 improper management of internal resources with the qemu/qemu_driver.c in libvirt while holding of a monitor job during a query to a guest agent, which allows attackers to cause a denial of service (API blockage).

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libvirt: 4.0.0 - 5.10.0

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External links
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=953078
https://bugzilla.redhat.com/show_bug.cgi?id=1809740
https://libvirt.org/git/?p=libvirt.git;a=commit;h=a663a860819287e041c3de672aad1d8543098ecc
https://security-tracker.debian.org/tracker/CVE-2019-20485
https://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg1730509.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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