openEuler 20.03 LTS SP3 update for qemu

1) Out-of-bounds write

EUVDB-ID: #VU72306

Risk: Medium

CVSSv3.1: 4.9 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3638

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

Exploit availability: No

Description

The vulnerability allows a malicious guest to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the ATI VGA device emulation of QEMU within the ati_2d_blt() routine while handling MMIO write operations. A malicious guest can crash the QEMU process on the host.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS SP3

qemu-seabios: before 4.1.0-75

qemu-help: before 4.1.0-75

qemu-block-ssh: before 4.1.0-75

qemu-guest-agent: before 4.1.0-75

qemu-block-curl: before 4.1.0-75

qemu-debugsource: before 4.1.0-75

qemu-debuginfo: before 4.1.0-75

qemu-block-rbd: before 4.1.0-75

qemu-block-iscsi: before 4.1.0-75

qemu-img: before 4.1.0-75

qemu: before 4.1.0-75

External links

http://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2022-1996

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.