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Vulnerability of Dnsmasq: out-of-bounds memory reading via do_doctor

Synthesis of the vulnerability 

An attacker can force a read at an invalid address via do_doctor() of Dnsmasq, in order to trigger a denial of service, or to obtain sensitive information.
Impacted systems: Debian, Dnsmasq, Ubuntu.
Severity of this alert: 2/4.
Creation date: 02/08/2019.
Références of this alert: CVE-2019-14513, DLA-1921-1, USN-4924-1, VIGILANCE-VUL-29933.

Description of the vulnerability 

An attacker can force a read at an invalid address via do_doctor() of Dnsmasq, in order to trigger a denial of service, or to obtain sensitive information.
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This cybersecurity alert impacts software or systems such as Debian, Dnsmasq, 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 internet server.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a specialist ability can exploit this security weakness.

Solutions for this threat 

Dnsmasq: version 2.76.
The version 2.76 is fixed:
  http://www.thekelleys.org.uk/dnsmasq/

Debian 8: new dnsmasq packages.
New packages are available:
  Debian 8: dnsmasq 2.72-3+deb8u5

Ubuntu 16.04: new dnsmasq packages.
New packages are available:
  Ubuntu 16.04 LTS: dnsmasq 2.75-1ubuntu0.16.04.10
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