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 force a read at an invalid address via ohci_service_td() of QEMU, in order to trigger a denial of service, or to obtain sensitive information on the host system.
Impacted software: Debian, QEMU, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 30/11/2020.
Références of this announce: CVE-2020-25624, DLA-2469-1, USN-4650-1, VIGILANCE-VUL-33988.

Description of the vulnerability 


An attacker, inside a guest system, can force a read at an invalid address via ohci_service_td() of QEMU, in order to trigger a denial of service, or to obtain sensitive information on the host system.
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This cybersecurity vulnerability impacts software or systems such as Debian, QEMU, Ubuntu.

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

Solutions for this threat 


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

Debian 9: new qemu packages.
New packages are available:
  Debian 9: qemu 1:2.8+dfsg-6+deb9u12

Ubuntu: new qemu packages.
New packages are available:
  Ubuntu 16.04 LTS: qemu 1:2.5+dfsg-5ubuntu10.48
  Ubuntu 18.04 LTS: qemu 1:2.11+dfsg-1ubuntu7.34
  Ubuntu 20.04 LTS: qemu 1:4.2-3ubuntu6.10
  Ubuntu 20.10: qemu 1:5.0-5ubuntu9.2
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Computer vulnerabilities tracking service 


Vigil@nce provides network vulnerability analysis. The Vigil@nce team tracks computer vulnerabilities impacting systems and applications.





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