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Vulnerability of ksh: code execution via Environment Variables Arithmetic Expressions

Synthesis of the vulnerability 

An attacker can use a vulnerability via Environment Variables Arithmetic Expressions of ksh, in order to run code.
Impacted products: Fedora, RHEL.
Severity of this bulletin: 2/4.
Creation date: 05/02/2020.
Références of this threat: CVE-2019-14868, FEDORA-2020-a0f0eb8500, FEDORA-2020-d940aca772, RHSA-2020:0431-01, RHSA-2020:0515-01, RHSA-2020:0559-01, RHSA-2020:0568-01, RHSA-2020:1332-01, RHSA-2020:1333-01, RHSA-2020:2210-01, VIGILANCE-VUL-31521.

Description of the vulnerability 

An attacker can use a vulnerability via Environment Variables Arithmetic Expressions of ksh, in order to run code.
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This vulnerability note impacts software or systems such as Fedora, RHEL.

Our Vigil@nce team determined that the severity of this cybersecurity vulnerability 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 note.

Solutions for this threat 

Fedora: new ksh packages.
New packages are available:
  Fedora 30: ksh 2020.0.0-2.fc30
  Fedora 31: ksh 2020.0.0-2.fc31

RHEL 6.10: new ksh packages.
New packages are available:
  RHEL 6.10: ksh 20120801-38.el6_10

RHEL 7.4, 7.5: new ksh packages.
New packages are available:
  RHEL 7.4: ksh 20120801-36.el7_4
  RHEL 7.5: ksh 20120801-138.el7_5

RHEL 7.6: new ksh packages.
New packages are available:
  RHEL 7.6: ksh 20120801-140.el7_6

RHEL 7.7: new ksh packages.
New packages are available:
  RHEL 7.7: ksh 20120801-140.el7_7

RHEL 8.0: new ksh packages.
New packages are available:
  RHEL 8.0: ksh 20120801-253.el8_0

RHEL 8.1: new ksh packages.
New packages are available:
  RHEL 8.1: ksh 20120801-253.el8_1
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