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.
The product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended.
| Link | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2023-1386 | third party advisory vdb entry |
| https://bugzilla.redhat.com/show_bug.cgi?id=2223985 | third party advisory issue tracking |
| https://github.com/advisories/GHSA-ppj8-867g-rgjr | |
| https://github.com/v9fs/linux/issues/29 | |
| https://security.netapp.com/advisory/ntap-20230831-0005/ |