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Vulnerability of Cyrus IMAP: privilege escalation via Sieve Script Fileinto Directive

Synthesis of the vulnerability 

An attacker can bypass restrictions via Sieve Script Fileinto Directive of Cyrus IMAP, in order to escalate his privileges.
Impacted software: Debian, Fedora, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 20/12/2019.
Références of this announce: CVE-2019-19783, DSA-4590-1, FEDORA-2019-7938c21723, FEDORA-2019-ad23a4522d, USN-4566-1, VIGILANCE-VUL-31198.

Description of the vulnerability 

An attacker can bypass restrictions via Sieve Script Fileinto Directive of Cyrus IMAP, in order to escalate his privileges.
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This computer weakness bulletin impacts software or systems such as Debian, Fedora, Ubuntu.

Our Vigil@nce team determined that the severity of this computer threat announce is medium.

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

An attacker with a expert ability can exploit this threat announce.

Solutions for this threat 

Debian 9/10: new cyrus-imapd packages.
New packages are available:
  Debian 9: cyrus-imapd 2.5.10-3+deb9u2
  Debian 10: cyrus-imapd 3.0.8-6+deb10u3

Fedora: new cyrus-imapd packages.
New packages are available:
  Fedora 30: cyrus-imapd 3.0.13-1.fc30
  Fedora 31: cyrus-imapd 3.0.13-1.fc31

Ubuntu 18.04: new cyrus packages.
New packages are available:
  Ubuntu 18.04 LTS: cyrus 2.5.10-3ubuntu1.1
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