PT-2021-7357 · Qemu+4 · Qemu+4

Cheolwoo Myung + 1 · Published 2021-02-02 · Updated 2022-09-30 · CVE-2021-3392

Positive Technologies (AI Summary)

CVSS v3.1

3.2

Low

Base vector

AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions QEMU versions 2.10.0 through 5.2.0

Description A use-after-free flaw was found in the MegaRAID emulator of QEMU. This issue occurs while processing SCSI I/O requests in the case of an error in the mptsas free request() function that does not dequeue the request object req from a pending requests queue. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service.

Recommendations For versions 2.10.0 through 5.2.0, consider disabling the mptsas free request() function as a temporary workaround until a patch is available. Restrict access to the MegaRAID emulator to minimize the risk of exploitation. Avoid using the req object in the affected SCSI I/O requests until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALT-PU-2021-1767

BDU:2022-05778

CVE-2021-3392

DLA-2623-1

DLA-3099-1

OESA-2021-1191

USN-5010-1

Affected Products

Alt Linux

Astra Linux

Linuxmint

Qemu

Ubuntu

References · 53

• 🔥 https://bugs.launchpad.net/qemu/+bug/1914236 · Exploit
• https://ubuntu.com/security/CVE-2021-3527 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2022-0819SE17 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-3392 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-3392 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3392 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3409 · Security Note
• https://osv.dev/vulnerability/CVE-2021-3392 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3595 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3544 · Vendor Advisory
• https://osv.dev/vulnerability/USN-5010-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-35505 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-20257 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2021-1191 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-05778 · Security Note