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Vulnerability of Bouncy Castle: information disclosure via OAEPEncoding Observable Differences

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via OAEPEncoding Observable Differences of Bouncy Castle, in order to obtain sensitive information.
Vulnerable software: Bouncy Castle JCE, Debian.
Severity of this announce: 1/4.
Creation date: 03/11/2020.
Références of this computer vulnerability: CVE-2020-26939, DLA-2433-1, VIGILANCE-VUL-33769.

Description of the vulnerability 

An attacker can bypass access restrictions to data via OAEPEncoding Observable Differences of Bouncy Castle, in order to obtain sensitive information.
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This security weakness impacts software or systems such as Bouncy Castle JCE, Debian.

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

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 threat.

Solutions for this threat 

Bouncy Castle: version 1.55.
The version 1.55 is fixed:
  https://www.bouncycastle.org/fr/latest_releases.html

Bouncy Castle: patch for OAEPEncoding Observable Differences.
A patch is indicated in information sources.

Debian 9: new bouncycastle packages.
New packages are available:
  Debian 9: bouncycastle 1.56-1+deb9u3
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Computer vulnerabilities tracking service 

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