Integer overflow in QEMU - CVE-2020-12829

Vulnerability identifier: #VU46318

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-12829

CWE-ID: CWE-190

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to integer overflow in the SM501 display driver implementation. This flaw occurs in the COPY_AREA macro while handling MMIO write operations through the sm501_2d_engine_write() callback. A remote user could abuse this flaw to crash the QEMU process in sm501_2d_operation() in hw/display/sm501.c on the host, resulting in a denial of service.

QEMU
qemu (Debian package)
qemu-system-aarch64 (Ubuntu package)
qemu-system-x86 (Ubuntu package)
qemu (Ubuntu package)
qemu-system-sparc (Ubuntu package)
qemu-system (Ubuntu package)
qemu-system-arm (Ubuntu package)
qemu-system-s390x (Ubuntu package)
qemu-system-mips (Ubuntu package)
qemu-system-ppc (Ubuntu package)
qemu-system-x86-microvm (Ubuntu package)
qemu-system-x86-xen (Ubuntu package)
Ubuntu

Install updates from vendor's website.

QEMU - update to 5.1.0
qemu (Debian package) - update to 1:3.1+dfsg-8+deb10u8
qemu-system-aarch64 (Ubuntu package) - update to 1:2.5+dfsg-5ubuntu10.45
qemu-system-x86 (Ubuntu package) - addressed in versions 1:2.5+dfsg-5ubuntu10.45, 1:2.11+dfsg-1ubuntu7.31, 1:4.2-3ubuntu6.4
qemu (Ubuntu package) - addressed in versions 1:2.5+dfsg-5ubuntu10.45, 1:2.11+dfsg-1ubuntu7.31, 1:4.2-3ubuntu6.4
qemu-system-sparc (Ubuntu package) - addressed in versions 1:2.5+dfsg-5ubuntu10.45, 1:2.11+dfsg-1ubuntu7.31, 1:4.2-3ubuntu6.4
qemu-system (Ubuntu package) - addressed in versions 1:2.5+dfsg-5ubuntu10.45, 1:2.11+dfsg-1ubuntu7.31, 1:4.2-3ubuntu6.4
qemu-system-arm (Ubuntu package) - addressed in versions 1:2.5+dfsg-5ubuntu10.45, 1:4.2-3ubuntu6.4
qemu-system-s390x (Ubuntu package) - addressed in versions 1:2.5+dfsg-5ubuntu10.45, 1:2.11+dfsg-1ubuntu7.31, 1:4.2-3ubuntu6.4
qemu-system-mips (Ubuntu package) - addressed in versions 1:2.5+dfsg-5ubuntu10.45, 1:2.11+dfsg-1ubuntu7.31, 1:4.2-3ubuntu6.4
qemu-system-ppc (Ubuntu package) - addressed in versions 1:2.5+dfsg-5ubuntu10.45, 1:2.11+dfsg-1ubuntu7.31, 1:4.2-3ubuntu6.4
qemu-system-x86-microvm (Ubuntu package) - update to 1:4.2-3ubuntu6.4
qemu-system-x86-xen (Ubuntu package) - update to 1:4.2-3ubuntu6.4

• https://bugzilla.redhat.com/show_bug.cgi?id=1808510
• https://usn.ubuntu.com/4467-1/

• Denial of service in QEMU
• Debian update for qemu
• Ubuntu update for qemu