CVE-2021-4206

A flaw was found in the QXL display device emulation in QEMU. An integer overflow in the cursor_alloc() function can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. This flaw allows a malicious privileged guest user to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.

CVSS v3.0 8.2 HIGH
CVSS v2.0 4.6 MEDIUM

8.2^/10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 1.5 / Impact : 6.0

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

4.6^/10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:L/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 3.9 / Impact : 6.4

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://starlabs.sg/advisories/21-4206/	Exploit Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2036998	Issue Tracking Third Party Advisory
https://www.debian.org/security/2022/dsa-5133	Third Party Advisory
https://security.gentoo.org/glsa/202208-27	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:o:redhat:enterprise_linux:8.0::::advanced_virtualization:::
	cpe:2.3:o:redhat:enterprise_linux:8.0::::-:::

Configuration 3 (hide)

OR	cpe:2.3:o:debian:debian_linux:10.0:::::::*
	cpe:2.3:o:debian:debian_linux:11.0:::::::*

Information

Published : 2022-04-29 10:15

Updated : 2022-09-23 08:13

NVD link : CVE-2021-4206

Mitre link : CVE-2021-4206

JSON object : View

CWE

CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CWE-131

Incorrect Calculation of Buffer Size

CWE-190

Integer Overflow or Wraparound

Products Affected

debian

debian_linux

redhat

enterprise_linux

qemu

qemu

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8.2 /10