Out-of-bounds write in QEMU - CVE-2021-3638
Published: February 15, 2023
Vulnerability identifier: #VU72306
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-3638
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: QEMU
Affected software:
QEMU
QEMU
Detailed vulnerability 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.
How to mitigate CVE-2021-3638
Install updates from vendor's website.
Sources
- https://bugzilla.redhat.com/show_bug.cgi?id=1979858
- https://ubuntu.com/security/CVE-2021-3638
- https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg01682.html
- https://security.netapp.com/advisory/ntap-20220407-0003/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GTVPHLLXJ65BUMFBUUZ35F3J632SLFRK/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I7J5IRXJYLELW7D43A75LOWRUE5EU54O/