CVE-2023-1386 Qemu: 9pfs: suid/sgid bits not dropped on file write
A flaw in QEMU's 9pfs allows guest users to retain SUID/SGID bits on written files, potentially enabling privilege escalation within the guest or on the host.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-1386?
CVE-2023-1386 is a low-severity vulnerability in Fedoraproject Fedora, published on 24 Jul 2023. 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 the 9p passthrough filesystem (9pfs) implementation in QEMU. When a local user in the guest writes an executable file with SUID or SGID, none of these privileged bits are correctly dropped. As a result, in rare circumstances, this flaw could be used by malicious users in the guest to elevate their privileges within the guest and help a host local user to elevate privileges on the host.
Weakness: CWE-281
Which versions are affected by CVE-2023-1386?
It affects 2 products.
Products include Fedoraproject Fedora, Qemu Qemu.
How do I fix CVE-2023-1386?
Apply the vendor's patch.
Is CVE-2023-1386 being exploited?
There is no known exploitation of CVE-2023-1386 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as AZL-27767, AZL-35165, BELL-CVE-2023-1386, DEBIAN-CVE-2023-1386, ECHO-11bd-2260-c895, GHSA-ppj8-867g-rgjr and 4 more.