Security Bulletin
This security bulletin contains one medium risk vulnerability.
EUVDB-ID: #VU73788
Risk: Medium
CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2020-14394
CWE-ID:
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Exploit availability: No
DescriptionThe vulnerability allows an attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to infinite loop in the USB xHCI controller emulation of QEMU while computing the length of the Transfer Request Block (TRB) Ring. A privileged user on the guest OS can consume all available system resources and cause denial of service conditions of the QEMU process on the host.
MitigationInstall updates from vendor's website.
Vulnerable software versionsQEMU: All versions
CPE2.3 External linkshttps://bugzilla.redhat.com/show_bug.cgi?id=1908004
https://gitlab.com/qemu-project/qemu/-/issues/646
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I7J5IRXJYLELW7D43A75LOWRUE5EU54O/
https://lists.debian.org/debian-lts-announce/2023/03/msg00013.html
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.