race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environment (PVE) 9.x pve-manager before…
Summary
A race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environment (PVE) 9.x pve-manager before 9.1.9 and 8.x before 8.4.19; qemu-server 9.x before 9.1.7 and 8.x before 8.4.7; and pve-container before 6.1.3 (PVE 9.x) and before 5.3.4 (PVE 8.x) allows an attacker with privileges to call "vncproxy" to hijack a VNC session that is established in parallel by a different user for a different VM.
What this means
In plain English
A race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environment (PVE) 9.x pve-manager before 9.1.9 and 8.x before 8.4.19; qemu-server 9.x before 9.1.7 and 8.x before 8.4.7; and pve-container before 6.1.3 (PVE 9.x) and before 5.3.4 (PVE 8.x) allows an attacker with privileges to call "vncproxy" to hijack a VNC session that is established in parallel by a different user for a different VM.
Recommended action
Primary action: update to a vendor-listed fixed release: 9.1.9, 8.4.19, 9.1.7, 8.4.7, 6.1.3, 5.3.4.
Rewritten locally from the scraped official advisory data above; no generative API is used. The vendor advisory is authoritative.
- before 9.1.9
- before 8.4.19
- before 9.1.7
- before 8.4.7
- before 6.1.3
- before 5.3.4
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 9.1.9
- 8.4.19
- 9.1.7
- 8.4.7
- 6.1.3
- 5.3.4
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 9.1.9, 8.4.19, 9.1.7, 8.4.7, 6.1.3, 5.3.4. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Discussion(0)
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