PT-2019-2029 · Qemu+5 · Libvirt+5

Published 2019-02-01 · Updated 2019-08-30 · CVE-2019-3840

Positive Technologies (AI Summary)

CVSS v3.1

6.3

Medium

Base vector

AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions libvirt versions prior to 5.0.0

Description A NULL pointer dereference flaw was discovered in the way libvirt gets interface information through the QEMU agent. This issue can be exploited by an attacker in a guest VM to crash libvirtd, causing a denial of service. The flaw is related to the virJSONValueObjectHasKey() function.

Recommendations For versions prior to 5.0.0, update to version 5.0.0 or later to resolve the issue. As a temporary workaround, consider restricting access to the QEMU agent to minimize the risk of exploitation.

Exploit

Fix

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALT-PU-2019-1163

BDU:2019-01742

CESA-2019_2294

CVE-2019-3840

ELSA-2019-2294

MGASA-2019-0138

OPENSUSE-SU-2019:1288-1

OPENSUSE-SU-2019_1288-1

OPENSUSE-SU-2019_1294-1

RHSA-2019:2294

RHSA-2019_2294

SUSE-SU-2019:0553-1

SUSE-SU-2019:0936-1

SUSE-SU-2019:0948-1

SUSE-SU-2019:1042-1

SUSE-SU-2019_0553-1

SUSE-SU-2019_0936-1

SUSE-SU-2019_0948-1

SUSE-SU-2019_1042-1

USN-3909-1

Affected Products

Alt Linux

Centos

Red Hat

Suse

Ubuntu

Libvirt

References · 72

• 🔥 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3840 · Exploit
• 🔥 https://redhat.com/archives/libvir-list/2019-January/msg00241.html · Exploit
• 🔥 https://bugzilla.redhat.com/show_bug.cgi?id=1663051 · Exploit
• https://bdu.fstec.ru/vul/2019-01742 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2019-3840 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2019:2294 · Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00101.html · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2019-3840 · Security Note
• http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00105.html · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2019:0936-1 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2019-0138 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-3840 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2019-0138.html · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2019:0553-1 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2019-2294.html · Vendor Advisory