Security Bulletin
This security bulletin contains one high risk vulnerability.
EUVDB-ID: #VU58813
Risk: High
CVSSv3.1: 7.8 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-3748
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a remote guest to compromise vulnerable system.
The vulnerability exists due to a use-after-free error when in the virtio-net device of QEMU. A malicious guest can trigger the use-after-free error and execute arbitrary code on the host system with QEMU privileges.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
MitigationInstall updates from vendor's repository.
Vulnerable software versionsopenEuler: 20.03 LTS SP1 - 20.03 LTS SP2
qemu-seabios: before 4.1.0-57
qemu-help: before 4.1.0-57
qemu-img: before 4.1.0-57
qemu-debuginfo: before 4.1.0-57
qemu-block-curl: before 4.1.0-57
qemu-guest-agent: before 4.1.0-57
qemu-block-ssh: before 4.1.0-57
qemu-block-iscsi: before 4.1.0-57
qemu-block-rbd: before 4.1.0-57
qemu-debugsource: before 4.1.0-57
qemu: before 4.1.0-57
External linkshttp://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1371
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.