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Vulnerability of QEMU: use after free via hw/usb/hcd-ehci.c

Synthesis of the vulnerability 

An attacker, inside a guest system, can force the usage of a freed memory area via hw/usb/hcd-ehci.c of QEMU, in order to trigger a denial of service, and possibly to run code on the host system.
Vulnerable products: Debian, BIG-IP Hardware, TMOS, QEMU, Ubuntu.
Severity of this weakness: 2/4.
Creation date: 17/09/2020.
Références of this bulletin: CVE-2020-25084, DLA-2560-1, K41301038, USN-4650-1, VIGILANCE-VUL-33342.

Description of the vulnerability 

An attacker, inside a guest system, can force the usage of a freed memory area via hw/usb/hcd-ehci.c 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 announce impacts software or systems such as Debian, BIG-IP Hardware, TMOS, QEMU, Ubuntu.

Our Vigil@nce team determined that the severity of this cybersecurity bulletin 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 threat alert.

Solutions for this threat 

QEMU: patch for hw/usb/hcd-ehci.c.
A patch is indicated in information sources.

Debian 9: new qemu packages.
New packages are available:
  Debian 9: qemu 1:2.8+dfsg-6+deb9u13

F5 BIG-IP: solution for QEMU CVE-2020-25084.
The solution is indicated in information sources.

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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