#VU78780 Permissions, Privileges, and Access Controls in QEMU - CVE-2023-2861

Vulnerability identifier: #VU78780

Vulnerability risk: Low

CVSSv4.0: 5.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-2861

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
QEMU
Client/Desktop applications / Virtualization software

Vendor: QEMU

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to an error in the 9p passthrough filesystem (9pfs) implementation in QEMU. A local user can escape from the exported 9p tree by creating and opening a device file in the shared folder.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

QEMU: All versions

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External links
https://gitlab.com/qemu-project/qemu/-/commit/f6b0de53fb87ddefed348a39284c8e2f28dc4eda
https://bugzilla.redhat.com/show_bug.cgi?id=2219266
https://bugzilla.suse.com/show_bug.cgi?id=1212968

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.