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Vulnerability of Apache log4net: external XML entity injection via Configuration Files

Synthesis of the vulnerability 

An attacker can transmit malicious XML data via Configuration Files to Apache log4net, in order to read a file, scan sites, or trigger a denial of service.
Impacted products: Fedora.
Severity of this bulletin: 2/4.
Creation date: 25/05/2020.
Références of this threat: CVE-2018-1285, FEDORA-2020-73d380e9b9, FEDORA-2020-847775bf79, FEDORA-2020-cfc319e067, VIGILANCE-VUL-32331.

Description of the vulnerability 

An attacker can transmit malicious XML data via Configuration Files to Apache log4net, in order to read a file, scan sites, or trigger a denial of service.
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This computer vulnerability alert impacts software or systems such as Fedora.

Our Vigil@nce team determined that the severity of this computer threat alert 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 security vulnerability.

Solutions for this threat 

Fedora 30-32: new log4net packages.
New packages are available:
  Fedora 30: log4net 2.0.8-10.fc30
  Fedora 31: log4net 2.0.8-10.fc31
  Fedora 32: log4net 2.0.8-10.fc32
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