CVE-2023-2861: Qemu: 9pfs: improper access control on special files
First published: Fri Jun 30 2023(Updated: )
A flaw was found in the 9p passthrough filesystem (9pfs) implementation in QEMU. The 9pfs server did not prohibit opening special files on the host side, potentially allowing a malicious client to escape from the exported 9p tree by creating and opening a device file in the shared folder.
Credit: patrick@puiterwijk.org patrick@puiterwijk.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/qemu-kvm | <8.1.0 | 8.1.0 |
| ubuntu/qemu | <1:4.2-3ubuntu6.28 | 1:4.2-3ubuntu6.28 |
| ubuntu/qemu | <1:6.2+dfsg-2ubuntu6.16 | 1:6.2+dfsg-2ubuntu6.16 |
| ubuntu/qemu | <1:7.2+dfsg-5ubuntu2.4 | 1:7.2+dfsg-5ubuntu2.4 |
| debian/qemu | <=1:5.2+dfsg-11+deb11u3<=1:5.2+dfsg-11+deb11u2 | 1:7.2+dfsg-7+deb12u7 1:9.0.2+ds-2 1:9.1.0+ds-3 |
| QEMU KVM | <8.1.0 |
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Reference Links
- https://gitlab.com/qemu-project/qemu/-/commit/f6b0de53fb87ddefed348a39284c8e2f28dc4eda
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2219306
- https://access.redhat.com/security/cve/cve-2023-2861
- https://bugzilla.redhat.com/show_bug.cgi?id=2219266
- https://access.redhat.com/security/cve/CVE-2023-2861
- https://security.netapp.com/advisory/ntap-20240125-0005/
- https://security.netapp.com/advisory/ntap-20240229-0002/
- https://lists.debian.org/debian-lts-announce/2024/03/msg00012.html
- https://security-tracker.debian.org/tracker/CVE-2023-2861
- https://launchpad.net/bugs/cve/CVE-2023-2861
- https://ubuntu.com/security/notices/USN-6567-1
- https://www.cve.org/CVERecord?id=CVE-2023-2861
- https://nvd.nist.gov/vuln/detail/CVE-2023-2861
- https://ubuntu.com/security/CVE-2023-2861
Frequently Asked Questions
What is the severity of CVE-2023-2861?
CVE-2023-2861 has a high severity rating due to the potential for unauthorized file access and system escape.
How do I fix CVE-2023-2861?
To fix CVE-2023-2861, update QEMU to the latest version specified in the mitigation guidelines for your operating system.
What systems are affected by CVE-2023-2861?
CVE-2023-2861 affects multiple versions of QEMU running on Red Hat and Ubuntu systems.
Can CVE-2023-2861 be exploited remotely?
Yes, CVE-2023-2861 can be exploited by a malicious client connecting to the 9p passthrough filesystem.
What kind of vulnerability is CVE-2023-2861?
CVE-2023-2861 is a filesystem vulnerability allowing potential escape from a restricted environment.
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