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Vulnerability of Vixie Cron: use after free via force_rescan_user

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via force_rescan_user() of Vixie Cron, in order to trigger a denial of service, and possibly to run code.
Vulnerable products: Debian.
Severity of this weakness: 2/4.
Creation date: 22/03/2019.
Références of this bulletin: CVE-2019-9706, DLA-1723-1, VIGILANCE-VUL-28806.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via force_rescan_user() of Vixie Cron, in order to trigger a denial of service, and possibly to run code.
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This security threat impacts software or systems such as Debian.

Our Vigil@nce team determined that the severity of this computer weakness note 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 computer threat alert.

Solutions for this threat 

Debian 8: new cron packages.
New packages are available:
  Debian 8: cron 3.0pl1-127+deb8u2
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