CVE-2023-6683: Qemu: vnc: null pointer dereference in qemu_clipboard_request()
First published: Sat Dec 16 2023(Updated: )
A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. The qemu_clipboard_request() function can be reached before vnc_server_cut_text_caps() was called and had the chance to initialize the clipboard peer, leading to a NULL pointer dereference. This could allow a malicious authenticated VNC client to crash QEMU and trigger a denial of service.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/qemu-kvm | <9.0.0 | 9.0.0 |
| QEMU qemu | >=6.1.0<9.0.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =9.0 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2023-6683
- https://bugzilla.redhat.com/show_bug.cgi?id=2254825
- https://security.netapp.com/advisory/ntap-20240223-0001/
- https://lists.nongnu.org/archive/html/qemu-devel/2024-01/msg02382.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2258118
- https://gitlab.com/qemu-project/qemu/-/commit/405484b29f6548c7b86549b0f961b906337aa68a
- https://access.redhat.com/errata/RHSA-2024:2135
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