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Vulnerability of exif: NULL pointer dereference via XML Formatted Printing

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via XML Formatted Printing of exif, in order to trigger a denial of service.
Vulnerable products: Fedora.
Severity of this weakness: 1/4.
Creation date: 19/05/2021.
Références of this bulletin: CVE-2021-27815, FEDORA-2021-04f7b000fa, FEDORA-2021-477809f45f, FEDORA-2021-b2bd2b1d13, VIGILANCE-VUL-35472.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via XML Formatted Printing of exif, in order to trigger a denial of service.
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This computer vulnerability impacts software or systems such as Fedora.

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

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

An attacker with a expert ability can exploit this weakness.

Solutions for this threat 

Fedora 32-33: new exif packages.
New packages are available:
  Fedora 32: exif 0.6.22-1.fc32
  Fedora 33: exif 0.6.22-1.fc33

Fedora 34: new exif packages.
New packages are available:
  Fedora 34: exif 0.6.22-1.fc34
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