#VU22783 Infinite loop in QEMU - CVE-2019-12068

Vulnerability identifier: #VU22783

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-12068

CWE-ID: CWE-835

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
QEMU
Client/Desktop applications / Virtualization software

Vendor: QEMU

Description

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

The vulnerability exists due to infinite loop in lsi_execute_script() when reading empty opcode. A local user can consume all available system resources and cause denial of service conditions.

Mitigation
Install update from vendor's website.

Vulnerable software versions

QEMU: 2.1.0 - 4.1.0

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External links
https://lists.opensuse.org/opensuse-security-announce/2019-11/msg00034.html
https://lists.opensuse.org/opensuse-security-announce/2019-11/msg00038.html
https://git.qemu.org/?p=qemu.git;a=commit;h=de594e47659029316bbf9391efb79da0a1a08e08
https://lists.debian.org/debian-lts-announce/2019/09/msg00021.html
https://lists.gnu.org/archive/html/qemu-devel/2019-08/msg01518.html
https://security-tracker.debian.org/tracker/CVE-2019-12068
https://usn.ubuntu.com/4191-2/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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