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Vulnerability of Cyrus SASL: buffer overflow via _sasl_add_string

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via _sasl_add_string() of Cyrus SASL, in order to trigger a denial of service, and possibly to run code.
Vulnerable software: iOS by Apple, iPhone, Mac OS X, Cyrus SASL, Debian, Fedora, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this announce: 3/4.
Creation date: 20/12/2019.
Références of this computer vulnerability: 587, 9123, CVE-2019-19906, DLA-2044-1, DSA-4591-1, FEDORA-2020-bf829f9a84, HT211288, HT211289, RHSA-2020:4497-01, SUSE-SU-2020:14579-1, SUSE-SU-2020:3939-1, USN-4256-1, VIGILANCE-VUL-31207.

Description of the vulnerability 

An attacker can trigger a buffer overflow via _sasl_add_string() of Cyrus SASL, in order to trigger a denial of service, and possibly to run code.
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This weakness bulletin impacts software or systems such as iOS by Apple, iPhone, Mac OS X, Cyrus SASL, Debian, Fedora, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer weakness is important.

The trust level is of type confirmed by the editor, with an origin of intranet client.

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

Solutions for this threat 

Cyrus SASL: patch for _sasl_add_string.
A patch is indicated in information sources.

Apple iOS: version 13.6.
The version 13.6 is fixed:
  https://support.apple.com/

Apple macOS: version 10.13.6-2020-004.
The version 10.13.6-2020-004 is fixed:
  https://support.apple.com/

Apple macOS: version 10.14.6-2020-004.
The version 10.14.6-2020-004 is fixed:
  https://support.apple.com/

Apple macOS: version 10.15.6.
The version 10.15.6 is fixed:
  https://support.apple.com/

Debian 8: new cyrus-sasl2 packages.
New packages are available:
  Debian 8: cyrus-sasl2 2.1.26.dfsg1-13+deb8u2

Debian 9/10: new cyrus-sasl2 packages.
New packages are available:
  Debian 9: cyrus-sasl2 2.1.27~101-g0780600+dfsg-3+deb9u1
  Debian 10: cyrus-sasl2 2.1.27+dfsg-1+deb10u1

Fedora 31: new cyrus-sasl packages.
New packages are available:
  Fedora 31: cyrus-sasl 2.1.27-3.fc31

RHEL 8: new cyrus-sasl packages.
New packages are available:
  RHEL 8.0-8.2: cyrus-sasl 2.1.27-5.el8

SUSE LE 11 SP3-4: new cyrus-sasl packages.
New packages are available:
  SUSE LE 11 SP3: cyrus-sasl 2.1.22-182.26.4.1
  SUSE LE 11 SP4: cyrus-sasl 2.1.22-182.26.4.1

SUSE LE 12 SP2-5: new cyrus-sasl packages.
New packages are available:
  SUSE LE 12 SP2: cyrus-sasl 2.1.26-8.13.1
  SUSE LE 12 SP3: cyrus-sasl 2.1.26-8.13.1
  SUSE LE 12 SP4: cyrus-sasl 2.1.26-8.13.1
  SUSE LE 12 SP5: cyrus-sasl 2.1.26-8.13.1

Ubuntu: new libsasl2-2 packages.
New packages are available:
  Ubuntu 19.10: libsasl2-2 2.1.27+dfsg-1ubuntu0.1
  Ubuntu 18.04 LTS: libsasl2-2 2.1.27~101-g0780600+dfsg-3ubuntu2.1
  Ubuntu 16.04 LTS: libsasl2-2 2.1.26.dfsg1-14ubuntu0.2
  Ubuntu 14.04 ESM: libsasl2-2 2.1.25.dfsg1-17ubuntu0.1~esm1
  Ubuntu 12.04 ESM: libsasl2-2 2.1.25.dfsg1-3ubuntu0.2

Wind River Linux: version 10.17.41.20.
The version 10.17.41.20 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.18.44.15.
The version 10.18.44.15 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.19.45.6.
The version 10.19.45.6 is fixed:
  https://support2.windriver.com/
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