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Vulnerability of Gnuplot: use after free via print_set_output

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via print_set_output() of Gnuplot, in order to trigger a denial of service, and possibly to run code.
Vulnerable software: openSUSE Leap, SLES.
Severity of this announce: 2/4.
Creation date: 23/02/2021.
Références of this computer vulnerability: CVE-2020-25559, openSUSE-SU-2021:0345-1, SUSE-SU-2021:0549-1, VIGILANCE-VUL-34657.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via print_set_output() of Gnuplot, 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 openSUSE Leap, SLES.

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 

openSUSE Leap 15.2: new gnuplot packages.
New packages are available:
  openSUSE Leap 15.2: gnuplot 5.2.2-lp152.6.3.1

SUSE LE 15 SP2: new gnuplot packages.
New packages are available:
  SUSE LE 15 SP2: gnuplot 5.2.2-3.6.1
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