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Vulnerability of Netty: information disclosure via Temporary File

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via Temporary File of Netty, in order to obtain sensitive information.
Vulnerable software: Kafka, Debian.
Severity of this announce: 2/4.
Creation date: 11/02/2021.
Références of this computer vulnerability: CVE-2021-21290, DLA-2555-1, DSA-4885-1, VIGILANCE-VUL-34567.

Description of the vulnerability 

An attacker can bypass access restrictions to data via Temporary File of Netty, in order to obtain sensitive information.
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This computer threat bulletin impacts software or systems such as Kafka, Debian.

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

Solutions for this threat 

Apache Kafka: version 2.6.2.
The version 2.6.2 is fixed:
  https://kafka.apache.org/downloads#2.6.2

Debian 10: new netty packages.
New packages are available:
  Debian 10: netty 1:4.1.33-1+deb10u2

Debian 9: new netty packages.
New packages are available:
  Debian 9: netty 1:4.1.7-2+deb9u3
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Computer vulnerabilities tracking service 

Vigil@nce provides a network vulnerability alert. The technology watch team tracks security threats targeting the computer system.