Denial of service in QEMU VNC server



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-3165
CWE-ID CWE-191
Exploitation vector Network
Public exploit N/A
Vulnerable software
 QEMU
Client/Desktop applications / Virtualization software

Vendor QEMU

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Integer underflow

EUVDB-ID: #VU72307

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-3165

CWE-ID: CWE-191 - Integer underflow

Exploit availability: No

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to integer underflow in the QEMU VNC server while processing ClientCutText messages in the extended format. A remote client can send a specially crafted payload message to the VNC server and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

QEMU: All versions

CPE2.3 External links

https://gitlab.com/qemu-project/qemu/-/commit/d307040b18
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I36LKZA7Z65J3LJU2P37LVTWDFTXBMPU/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZTY7TVHX62OJWF6IOBCIGLR2N5K4QN3E/
https://security.netapp.com/advisory/ntap-20221223-0006/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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