Vulnerability CVE-2021-20221: Information
Description
An out-of-bounds heap buffer access issue was found in the ARM Generic Interrupt Controller emulator of QEMU up to and including qemu 4.2.0on aarch64 platform. The issue occurs because while writing an interrupt ID to the controller memory area, it is not masked to be 4 bits wide. It may lead to the said issue while updating controller state fields and their subsequent processing. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.
Severity: MEDIUM (6.0) Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
Fixed packages
Package name | Branch | Fixed in version | Version from repository | Errata ID | Task # | State |
|---|---|---|---|---|---|---|
| qemu | sisyphus | 5.0.0-alt1 | 8.2.3-alt1 | ALT-PU-2020-1912-1 | 250869 | Fixed |
| qemu | sisyphus_e2k | 7.2.0-alt3.E2K.3 | 7.2.0-alt3.E2K.4 | ALT-PU-2024-1953-1 | - | Fixed |
| qemu | p10 | 5.0.0-alt1 | 8.2.2-alt0.p10.1 | ALT-PU-2020-1912-1 | 250869 | Fixed |
| qemu | p10_e2k | 7.2.0-alt3.E2K.0 | 7.2.0-alt3.E2K.3 | ALT-PU-2023-6766-1 | - | Fixed |
| qemu | p9 | 4.2.1-alt1 | 5.2.0-alt6 | ALT-PU-2020-2431-1 | 254589 | Fixed |
| qemu | c10f1 | 5.0.0-alt1 | 8.2.2-alt0.p10.1 | ALT-PU-2020-1912-1 | 250869 | Fixed |
| qemu | c9f2 | 4.2.1-alt1 | 5.2.0-alt6.c9.1 | ALT-PU-2020-2431-1 | 254589 | Fixed |
| qemu | p11 | 5.0.0-alt1 | 8.2.3-alt1 | ALT-PU-2020-1912-1 | 250869 | Fixed |
References to Advisories, Solutions, and Tools
Hyperlink | Resource |
|---|---|
| [debian-lts-announce] 20210218 [SECURITY] [DLA 2560-1] qemu security update |
|
| https://bugzilla.redhat.com/show_bug.cgi?id=1924601 |
|
| [oss-security] 20210205 CVE-2021-20221 QEMU: aarch64: GIC: out-of-bound heap buffer access via an interrupt ID field |
|
| https://security.netapp.com/advisory/ntap-20210708-0005/ |
|
| [debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security update |
|