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Vulnerability of BusyBox: integer overflow via get_next_block

Synthesis of the vulnerability 

An attacker can generate an integer overflow via get_next_block() of BusyBox, in order to trigger a denial of service, and possibly to run code.
Vulnerable software: BusyBox, Debian, Ubuntu.
Severity of this announce: 2/4.
Creation date: 25/10/2017.
Références of this computer vulnerability: 10431, CVE-2017-15873, DLA-1445-1, DLA-1445-2, DLA-1445-3, DLA-2559-1, USN-3935-1, VIGILANCE-VUL-24229.

Description of the vulnerability 

An attacker can generate an integer overflow via get_next_block() of BusyBox, in order to trigger a denial of service, and possibly to run code.
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This threat impacts software or systems such as BusyBox, Debian, Ubuntu.

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

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

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

Solutions for this threat 

BusyBox: patch for get_next_block.
A patch is indicated in information sources.

Debian 8: new busybox packages.
New packages are available:
  Debian 8: busybox 1:1.22.0-9+deb8u4

Debian 9: new busybox packages.
New packages are available:
  Debian 9: busybox 1:1.22.0-19+deb9u1

Ubuntu: new busybox packages.
New packages are available:
  Ubuntu 18.10: busybox 1:1.27.2-2ubuntu4.1
  Ubuntu 18.04 LTS: busybox 1:1.27.2-2ubuntu3.2
  Ubuntu 16.04 LTS: busybox 1:1.22.0-15ubuntu1.4
  Ubuntu 14.04 LTS: busybox 1:1.21.0-1ubuntu1.4
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