CVE-2023-1386: Qemu: 9pfs: suid/sgid bits not dropped on file write
First published: Wed Jul 19 2023(Updated: )
A flaw was discovered in 9pfs. Jietao Xiao and his team found that when a local user in the guest tries to write an executable file with SUID or SGID, none of these privileged bits are correctly dropped. As a result, in rare circumstances(exist an executable file owned by root, writable by others, has SUID/SGID bits), this flaw could be used by malicious users in the guest to elevate their privileges within the guest and help a host's local user to elevate privileges on the host. Upstream issue: <a href="https://github.com/v9fs/linux/issues/29">https://github.com/v9fs/linux/issues/29</a>
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU qemu | ||
| Fedoraproject Fedora | =38 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2023-1386
- https://bugzilla.redhat.com/show_bug.cgi?id=2223985
- https://security.netapp.com/advisory/ntap-20230831-0005/
- https://github.com/v9fs/linux/issues/29
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2223986
- https://github.com/advisories/GHSA-ppj8-867g-rgjr
Frequently Asked Questions
What is the vulnerability ID for this flaw?
The vulnerability ID for this flaw is CVE-2023-1386.
What is the severity level of CVE-2023-1386?
CVE-2023-1386 has a severity level of 7.8 (high).
What is the affected software for CVE-2023-1386?
The affected software for CVE-2023-1386 is QEMU and Fedora 38.
How can this vulnerability be exploited?
This vulnerability can be exploited by a local user in the guest writing an executable file with SUID or SGID.
Are there any fixes available for CVE-2023-1386?
Yes, fixes are available. Please refer to the provided references for more information.
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