Multiple vulnerabilities in QEMU

Published: 2022-11-15

Risk	High
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-3750 CVE-2021-3611
CWE-ID	CWE-416 CWE-787
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	QEMU Client/Desktop applications / Virtualization software
Vendor	QEMU

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU69353

Risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-3750

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the USB EHCI controller emulation of QEMU. A remote guest can trigger a use-after-free error and execute arbitrary code on the host OS.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

QEMU: 6.0.0 - 6.2.0 rc2

CPE2.3

External links

https://gitlab.com/qemu-project/qemu/-/issues/556
https://bugzilla.redhat.com/show_bug.cgi?id=1999073
https://gitlab.com/qemu-project/qemu/-/issues/541
https://security.netapp.com/advisory/ntap-20220624-0003/
https://security.gentoo.org/glsa/202208-27

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged 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.

2) Out-of-bounds write

EUVDB-ID: #VU69352

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-2021-3611

CWE-ID: CWE-787 - Out-of-bounds write