The Vigil@nce team watches public vulnerabilities impacting your computers, and then offers security solutions, a vigilance database and tools to fix them.


Synthesis of the vulnerability 


An attacker, inside a guest system, can trigger a buffer overflow via msix_table_mmio_write() of QEMU, in order to trigger a denial of service, and possibly to run code on the host system.
Vulnerable software: QEMU, Ubuntu.
Severity of this announce: 2/4.
Creation date: 09/12/2020.
Références of this computer vulnerability: CVE-2020-27821, RHBUG-1902651, USN-4725-1, VIGILANCE-VUL-34069.

Description of the vulnerability 


An attacker, inside a guest system, can trigger a buffer overflow via msix_table_mmio_write() of QEMU, in order to trigger a denial of service, and possibly to run code on the host system.
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This cybersecurity alert impacts software or systems such as QEMU, Ubuntu.

Our Vigil@nce team determined that the severity of this weakness 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 security weakness.

Solutions for this threat 


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

Ubuntu: new qemu packages.
New packages are available:
  Ubuntu 20.10: qemu 1:5.0-5ubuntu9.4
  Ubuntu 20.04 LTS: qemu 1:4.2-3ubuntu6.12
  Ubuntu 18.04 LTS: qemu 1:2.11+dfsg-1ubuntu7.35
  Ubuntu 16.04 LTS: qemu 1:2.5+dfsg-5ubuntu10.49
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Computer vulnerabilities tracking service 


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