Resource management error in libvirt - CVE-2019-20485

Vulnerability identifier: #VU27545

CSH Severity: Medium

CVSS v4: 7.1 [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]

CVE-ID: CVE-2019-20485

CWE-ID: CWE-399

Exploitation vector: Remote access

Exploit availability: No public exploit available

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).

libvirt
libvirt (Red Hat package)
libvirt
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Fedora

Install updates from vendor's website.

libvirt - update to 6.0.0
libvirt (Red Hat package) - update to 4.5.0-36.el7
libvirt - update to 5.6.0-7.fc31

• 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

• Denial of service in libvirt
• Red Hat Enterprise Linux 7 update for libvirt
• Red Hat Enterprise Linux 8 update for the virt:rhel and virt-devel:rhel modules
• Fedora 31 update for libvirt