CVE-2020-35517
First published: Wed Jan 13 2021(Updated: )
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.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU qemu | >=5.0.0<=5.2.50 | |
| debian/qemu | 1:5.2+dfsg-11+deb11u3 1:5.2+dfsg-11+deb11u2 1:7.2+dfsg-7+deb12u7 1:9.2.0+ds-2 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1915823
- https://github.com/qemu/qemu/commit/ebf101955ce8f8d72fba103b5151115a4335de2c
- https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg05461.html
- https://security.gentoo.org/glsa/202208-27
- https://security.netapp.com/advisory/ntap-20210312-0002/
- https://www.openwall.com/lists/oss-security/2021/01/22/1
- https://launchpad.net/bugs/cve/CVE-2020-35517
- https://virtio-fs.gitlab.io/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1919106
- https://access.redhat.com/errata/RHSA-2021:0711
- https://access.redhat.com/security/cve/cve-2020-35517
- https://access.redhat.com/errata/RHSA-2021:0743
- https://security-tracker.debian.org/tracker/CVE-2020-35517
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-35517
- https://nvd.nist.gov/vuln/detail/CVE-2020-35517
- https://ubuntu.com/security/CVE-2020-35517
Frequently Asked Questions
What is CVE-2020-35517?
CVE-2020-35517 is a vulnerability in qemu that allows a privileged guest user to create a device special file in the shared directory and use it to read/write access host devices, leading to a host privilege escalation.
What is the severity of CVE-2020-35517?
The severity of CVE-2020-35517 is high with a CVSS score of 8.2.
How does CVE-2020-35517 affect QEMU?
CVE-2020-35517 affects QEMU versions 5.0.0 to 5.2.50 and potentially allows a privileged guest user to gain host privilege by creating a device special file in the shared directory.
How can I fix CVE-2020-35517 on Ubuntu?
To fix CVE-2020-35517 on Ubuntu, update the `qemu` package to version 1:5.2+dfsg-6ubuntu2 or later.
How can I fix CVE-2020-35517 on Debian?
To fix CVE-2020-35517 on Debian, update the `qemu` package to the latest available version.
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