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Vulnerability of libbson: out-of-bounds memory reading via _bson_iter_next_internal

Synthesis of the vulnerability 

An attacker can force a read at an invalid address via _bson_iter_next_internal() of libbson, in order to trigger a denial of service, or to obtain sensitive information.
Vulnerable products: Fedora, MongoDB Server.
Severity of this weakness: 2/4.
Creation date: 11/09/2018.
Références of this bulletin: CVE-2018-16790, FEDORA-2018-2062cd7548, FEDORA-2018-77d864ff39, VIGILANCE-VUL-27198.

Description of the vulnerability 

An attacker can force a read at an invalid address via _bson_iter_next_internal() of libbson, in order to trigger a denial of service, or to obtain sensitive information.
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This weakness note impacts software or systems such as Fedora, MongoDB Server.

Our Vigil@nce team determined that the severity of this threat note 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 computer weakness.

Solutions for this threat 

Fedora: new libbson packages.
New packages are available:
  Fedora 27: libbson 1.9.5-3.fc27
  Fedora 28: libbson 1.9.5-3.fc28
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