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Vulnerability of XAR: NULL pointer dereference via xar_unserialize

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via xar_unserialize() of XAR, in order to trigger a denial of service.
Vulnerable products: Fedora.
Severity of this weakness: 1/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 03/02/2020.
Références of this bulletin: CVE-2017-11124, CVE-2018-17094-REJECT, FEDORA-2020-bbd24dd0cf, FEDORA-2020-edf53cd770, VIGILANCE-VUL-31494.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via xar_unserialize() of XAR, in order to trigger a denial of service.
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This computer vulnerability announce impacts software or systems such as Fedora.

Our Vigil@nce team determined that the severity of this cybersecurity bulletin is low.

The trust level is of type confirmed by the editor, with an origin of document.

This bulletin is about 2 vulnerabilities.

An attacker with a expert ability can exploit this threat alert.

Solutions for this threat 

Fedora 30: new xar packages.
New packages are available:
  Fedora 30: xar 1.8.0.417.1-1.fc30

Fedora 31: new xar packages.
New packages are available:
  Fedora 31: xar 1.8.0.417.1-1.fc31
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