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Vulnerability of Apache httpd mod_auth_digest: privilege escalation via Race Condition

Synthesis of the vulnerability 

An attacker can bypass restrictions via Race Condition of Apache httpd mod_auth_digest, in order to escalate his privileges.
Vulnerable systems: Apache httpd, Apache httpd Modules ~ not comprehensive, Debian, Fedora, HP-UX, openSUSE Leap, Oracle Communications, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 2/4.
Creation date: 02/04/2019.
Références of this weakness: CERTFR-2019-AVI-141, cpuapr2020, CVE-2019-0217, DLA-1748-1, DSA-4422-1, FEDORA-2019-a4ed7400f4, HPESBUX03950, openSUSE-SU-2019:1190-1, openSUSE-SU-2019:1209-1, openSUSE-SU-2019:1258-1, RHSA-2019:2343-01, RHSA-2019:3436-01, RHSA-2019:4126-01, SUSE-SU-2019:0873-1, SUSE-SU-2019:0878-1, SUSE-SU-2019:0888-1, SUSE-SU-2019:0888-2, SUSE-SU-2019:0889-1, USN-3937-1, USN-3937-2, VIGILANCE-VUL-28916.

Description of the vulnerability 

An attacker can bypass restrictions via Race Condition of Apache httpd mod_auth_digest, in order to escalate his privileges.
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This computer vulnerability impacts software or systems such as Apache httpd, Apache httpd Modules ~ not comprehensive, Debian, Fedora, HP-UX, openSUSE Leap, Oracle Communications, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this weakness bulletin 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 weakness.

Solutions for this threat 

Apache httpd: version 2.4.39.
The version 2.4.39 is fixed:
  https://httpd.apache.org/download.cgi

Debian 8: new apache2 packages.
New packages are available:
  Debian 8: apache2 2.4.10-10+deb8u14

Debian 9: new apache2 packages.
New packages are available:
  Debian 9: apache2 2.4.25-3+deb9u7

Fedora 28: new httpd packages.
New packages are available:
  Fedora 28: httpd 2.4.39-1.1.fc28

HP-UX Apache-based Web Server: version B.2.4.18.05.
The version B.2.4.18.05 is fixed:
  https://h20392.www2.hpe.com/portal/swdepot/displayProductInfo.do?productNumber=HPUXWSSUITE
  https://h20392.www2.hpe.com/portal/swdepot/displayProductInfo.do?productNumber=HPUXWSATW508

openSUSE Leap 15.0: new apache2 packages.
New packages are available:
  openSUSE Leap 15.0: apache2 2.4.33-lp150.2.17.1

openSUSE Leap 42.3: new apache2 packages.
New packages are available:
  openSUSE Leap 42.3: apache2 2.4.23-49.1

Oracle Communications: CPU of April 2020.
A Critical Patch Update is available:
  https://support.oracle.com/rs?type=doc&id=2647690.1
  https://support.oracle.com/rs?type=doc&id=2654603.1
  https://support.oracle.com/rs?type=doc&id=2652618.1
  https://support.oracle.com/rs?type=doc&id=2653087.1
  https://support.oracle.com/rs?type=doc&id=2653688.1
  https://support.oracle.com/rs?type=doc&id=2652610.1
  https://support.oracle.com/rs?type=doc&id=2653279.1
  https://support.oracle.com/rs?type=doc&id=2652619.1
  https://support.oracle.com/rs?type=doc&id=2652621.1
  https://support.oracle.com/rs?type=doc&id=2652606.1
  https://support.oracle.com/rs?type=doc&id=2653691.1
  https://support.oracle.com/rs?type=doc&id=2653692.1
  https://support.oracle.com/rs?type=doc&id=2647687.1
  https://support.oracle.com/rs?type=doc&id=2652622.1

RHEL 6: new httpd24-httpd packages.
New packages are available:
  RHEL 6.0-6.10: httpd24-httpd 2.4.34-15.el6

RHEL 7: new httpd packages.
New packages are available:
  RHEL 7: httpd 2.4.6-90.el7

RHEL 8: new httpd-2.4 module.
The following module is updated:
  RHEL 8 Module: httpd:2.4

SUSE LE 12: new apache2 packages.
New packages are available:
  SUSE LE 12 RTM: apache2 2.4.10-14.36.1
  SUSE LE 12 SP1: apache2 2.4.16-20.24.1
  SUSE LE 12 SP2: apache2 2.4.23-29.40.1
  SUSE LE 12 SP3: apache2 2.4.23-29.40.1
  SUSE LE 12 SP4: apache2 2.4.23-29.40.1

SUSE LE 15: new apache2 packages.
New packages are available:
  SUSE LE 15 RTM: apache2 2.4.33-3.15.1

Ubuntu 12.04: new apache2.2-bin packages.
New packages are available:
  Ubuntu 12.04 ESM: apache2.2-bin 2.2.22-1ubuntu1.15

Ubuntu: new apache2-bin packages.
New packages are available:
  Ubuntu 18.10: apache2-bin 2.4.34-1ubuntu2.1
  Ubuntu 18.04 LTS: apache2-bin 2.4.29-1ubuntu4.6
  Ubuntu 16.04 LTS: apache2-bin 2.4.18-2ubuntu3.10
  Ubuntu 14.04 LTS: apache2-bin 2.4.7-1ubuntu4.22
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