CVE-2020-35517 Privilege escalation in qemu
High 8.2
Published
Updated
Check this codebase for CVE-2020-35517 and fix it if it is affected.
What it is: CVE-2020-35517 is a high-severity vulnerability in Qemu Qemu, published on 28 Jan 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-35517 in the wild and no public exploit code.
Affected product: Qemu Qemu. 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-2020-35517/ (Markdown: https://insights.sbomify.com/CVE-2020-35517/index.md)
A privileged guest user can escalate privileges on the host by creating a device special file in a virtio-fs shared directory to access host devices.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-35517?
CVE-2020-35517 is a high-severity vulnerability in Qemu Qemu, published on 28 Jan 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was found in qemu. A host privilege escalation issue was found in the virtio-fs shared file system daemon where a privileged guest user is able to create a device special file in the shared directory and use it to r/w access host devices.
Weakness: CWE-269
Which versions are affected by CVE-2020-35517?
It affects 1 product.
Linux distribution packages (40)
hivex AlmaLinux:8 | All versions | 1.3.18-20.module_el8.3.0+2048+e7a0a3ea |
hivex-devel AlmaLinux:8 | All versions | 1.3.18-20.module_el8.3.0+2048+e7a0a3ea |
libguestfs-winsupport AlmaLinux:8 | All versions | 8.2-1.module_el8.3.0+2048+e7a0a3ea |
libguestfs-winsupport AlmaLinux:8 | All versions | 8.2-1.module_el8.5.0+2608+72063365 |
libiscsi AlmaLinux:8 | All versions | 1.18.0-8.module_el8.3.0+2048+e7a0a3ea |
libiscsi AlmaLinux:8 | All versions | 1.18.0-8.module_el8.5.0+2608+72063365 |
libiscsi AlmaLinux:8 | All versions | 1.18.0-8.module_el8.6.0+2880+7d9e3703 |
libiscsi-devel AlmaLinux:8 | All versions | 1.18.0-8.module_el8.3.0+2048+e7a0a3ea |
libiscsi-devel AlmaLinux:8 | All versions | 1.18.0-8.module_el8.5.0+2608+72063365 |
libiscsi-devel AlmaLinux:8 | All versions | 1.18.0-8.module_el8.6.0+2880+7d9e3703 |
libiscsi-utils AlmaLinux:8 | All versions | 1.18.0-8.module_el8.3.0+2048+e7a0a3ea |
libiscsi-utils AlmaLinux:8 | All versions | 1.18.0-8.module_el8.5.0+2608+72063365 |
libiscsi-utils AlmaLinux:8 | All versions | 1.18.0-8.module_el8.6.0+2880+7d9e3703 |
libnbd AlmaLinux:8 | All versions | 1.2.2-1.module_el8.3.0+2048+e7a0a3ea |
libnbd AlmaLinux:8 | All versions | 1.2.2-1.module_el8.5.0+2608+72063365 |
libnbd-devel AlmaLinux:8 | All versions | 1.2.2-1.module_el8.3.0+2048+e7a0a3ea |
libnbd-devel AlmaLinux:8 | All versions | 1.2.2-1.module_el8.5.0+2608+72063365 |
libvirt AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-admin AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-bash-completion AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-client AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-config-network AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-config-nwfilter AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-interface AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-network AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-nodedev AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-nwfilter AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-secret AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-storage AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-storage-core AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-storage-disk AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-storage-iscsi AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-storage-iscsi-direct AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-storage-logical AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-storage-mpath AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-storage-rbd AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-daemon-driver-storage-scsi AlmaLinux:8 | All versions | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea |
libvirt-dbus AlmaLinux:8 | All versions | 1.3.0-2.module_el8.3.0+2048+e7a0a3ea |
libvirt-dbus AlmaLinux:8 | All versions | 1.3.0-2.module_el8.5.0+2608+72063365 |
Products include Qemu Qemu.
How do I fix CVE-2020-35517?
Apply the vendor's patch.
Is CVE-2020-35517 being exploited?
There is no known exploitation of CVE-2020-35517 in the wild and no public exploit code.
Other vulnerabilities in Qemu Qemu
Sources
Also known as ALSA-2021:0711, DEBIAN-CVE-2020-35517, GHSA-jgxm-7vmw-79h7, RHSA-2021:0711, RHSA-2021:0743, RLSA-2021:0711.