CVE-2021-3527

 

Published at: - 27-05-2021 12:15

Last modified: - 05-09-2022 08:15

Total changes: - 10

Description

A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

 

Verification logic

 

Reference

• https://www.openwall.com/lists/oss-security/2021/05/05/5
• https://gitlab.com/qemu-project/qemu/-/commit/05a40b172e4d691371534828078be47e7fff524c
• https://bugzilla.redhat.com/show_bug.cgi?id=1955695
• https://gitlab.com/qemu-project/qemu/-/commit/7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986
• https://security.netapp.com/advisory/ntap-20210708-0008/
• [debian-lts-announce] 20210902 [SECURITY] [DLA 2753-1] qemu security update-Mailing List, Third Party Advisory
• GLSA-202208-27-
• [debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security update-

 

Keywords

NVD

 

CVE-2021-3527

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures