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Vulnerability of libpgf: use after free via Decoder.cpp

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via Decoder.cpp of libpgf, in order to trigger a denial of service, and possibly to run code.
Impacted systems: Debian, Ubuntu.
Severity of this alert: 2/4.
Creation date: 16/12/2019.
Références of this alert: CVE-2015-6673, DLA-2035-1, USN-4554-1, VIGILANCE-VUL-31157.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via Decoder.cpp of libpgf, in order to trigger a denial of service, and possibly to run code.
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This computer threat announce impacts software or systems such as Debian, Ubuntu.

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

Solutions for this threat 

Debian 8: new libpgf packages.
New packages are available:
  Debian 8: libpgf 6.14.12-3+deb8u1

Ubuntu 16.04: new libpgf6 packages.
New packages are available:
  Ubuntu 16.04 LTS: libpgf6 6.14.12-3.1ubuntu0.1
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