#VU80015 NULL pointer dereference in QEMU - CVE-2023-3354
Vulnerability identifier: #VU80015
Vulnerability risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID:
CWE-ID:
CWE-476
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
QEMU
Client/Desktop applications /
Virtualization software
Vendor: QEMU
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in the QEMU built-in VNC server. When a client connects to the VNC server, QEMU checks whether the current number of connections crosses a certain threshold and if so, cleans up the previous connection. If the previous connection happens to be in the handshake phase and fails, QEMU cleans up the connection again, resulting in NULL pointer dereference and denial of service.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
QEMU: All versions
External links
https://bugzilla.redhat.com/show_bug.cgi?id=2216478
https://access.redhat.com/security/cve/CVE-2023-3354
https://lists.nongnu.org/archive/html/qemu-devel/2023-07/msg01014.html
https://lists.nongnu.org/archive/html/qemu-devel/2023-07/msg02668.html
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
