CVE-2019-3840 Null dereference in libvirt
Medium 5.8
Published
Updated
Check this codebase for CVE-2019-3840 and fix it if it is affected.
What it is: CVE-2019-3840 is a medium-severity vulnerability in Opensuse Leap, published on 27 Mar 2019. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-3840 in the wild and no public exploit code.
Affected product: Opensuse Leap. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2019-3840/ (Markdown: https://insights.sbomify.com/CVE-2019-3840/index.md)
A guest VM attacker can crash the libvirt daemon via a NULL pointer dereference in QEMU agent interface handling, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2019-3840?
CVE-2019-3840 is a medium-severity vulnerability in Opensuse Leap, published on 27 Mar 2019. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A NULL pointer dereference flaw was discovered in libvirt before version 5.0.0 in the way it gets 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.
Weakness: CWE-476
Which versions are affected by CVE-2019-3840?
It affects 2 products.
Linux distribution packages (40)
libvirt Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-admin Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-bash-completion Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-client Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-config-network Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-config-nwfilter Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-interface Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-lxc Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-network Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-nodedev Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-nwfilter Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-qemu Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-secret Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-storage Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-storage-core Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-storage-disk Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-storage-gluster Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-storage-iscsi Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-storage-logical Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-storage-mpath Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-storage-rbd Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-storage-scsi Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-kvm Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-lxc Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-debuginfo Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-devel Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-docs Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-libs Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-lock-sanlock Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-login-shell Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt-nss Red Hat:enterprise_linux:7::client | All versions | 0:4.5.0-23.el7 |
libvirt Red Hat:enterprise_linux:7::computenode | All versions | 0:4.5.0-23.el7 |
libvirt-admin Red Hat:enterprise_linux:7::computenode | All versions | 0:4.5.0-23.el7 |
libvirt-bash-completion Red Hat:enterprise_linux:7::computenode | All versions | 0:4.5.0-23.el7 |
libvirt-client Red Hat:enterprise_linux:7::computenode | All versions | 0:4.5.0-23.el7 |
libvirt-daemon Red Hat:enterprise_linux:7::computenode | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-config-network Red Hat:enterprise_linux:7::computenode | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-config-nwfilter Red Hat:enterprise_linux:7::computenode | All versions | 0:4.5.0-23.el7 |
libvirt-daemon-driver-interface Red Hat:enterprise_linux:7::computenode | All versions | 0:4.5.0-23.el7 |
Products include Opensuse Leap, Redhat Libvirt.
How do I fix CVE-2019-3840?
Upgrade to a fixed version.
Is CVE-2019-3840 being exploited?
There is no known exploitation of CVE-2019-3840 in the wild and no public exploit code.
Other vulnerabilities in Opensuse Leap
Sources
Also known as DEBIAN-CVE-2019-3840, GHSA-rx4m-pcxc-jchp, MGASA-2019-0138, RHSA-2019:2294, SUSE-SU-2019:0553-1, SUSE-SU-2019:0936-1 and 3 more.