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Vulnerability of QEMU: integer overflow via sm501_2d_operation

Synthesis of the vulnerability 

An attacker, inside a guest system, can trigger an integer overflow via sm501_2d_operation() of QEMU, in order to trigger a denial of service, and possibly to run code on the host system.
Impacted systems: Debian, QEMU, Ubuntu.
Severity of this alert: 2/4.
Creation date: 20/08/2020.
Références of this alert: CVE-2020-12829, DSA-4760-1, USN-4467-1, VIGILANCE-VUL-33119.

Description of the vulnerability 

An attacker, inside a guest system, can trigger an integer overflow via sm501_2d_operation() of QEMU, in order to trigger a denial of service, and possibly to run code on the host system.
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This computer vulnerability note impacts software or systems such as Debian, QEMU, Ubuntu.

Our Vigil@nce team determined that the severity of this computer vulnerability announce is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this cybersecurity announce.

Solutions for this threat 

QEMU: patch for sm501_2d_operation.
A patch is indicated in information sources.

Debian 10: new qemu packages.
New packages are available:
  Debian 10: qemu 1:3.1+dfsg-8+deb10u8

Ubuntu: new qemu packages.
New packages are available:
  Ubuntu 20.04 LTS: qemu 1:4.2-3ubuntu6.4
  Ubuntu 18.04 LTS: qemu 1:2.11+dfsg-1ubuntu7.31
  Ubuntu 16.04 LTS: qemu 1:2.5+dfsg-5ubuntu10.45
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