A Python LDAP security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, 21.10, and 22.04 LTS.

USN-5508-1: Python LDAP vulnerability

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Ubuntu Security Notice USN-5508-1
July 11, 2022

python-ldap vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Python LDAP could be made to denial of service if it received a specially
crafted regular expression.

Software Description:
- python-ldap: LDAP interface module for Python3

Details:

It was discovered that Python LDAP incorrectly handled certain regular expressions.
An remote attacker could possibly use this issue to cause a denial of service.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.04 LTS:
python3-ldap 3.2.0-4ubuntu7.1
python3-pyldap 3.2.0-4ubuntu7.1

Ubuntu 21.10:
python3-ldap 3.2.0-4ubuntu5.1
python3-pyldap 3.2.0-4ubuntu5.1

Ubuntu 20.04 LTS:
python3-ldap 3.2.0-4ubuntu2.1
python3-pyldap 3.2.0-4ubuntu2.1

Ubuntu 18.04 LTS:
python-ldap 3.0.0-1ubuntu0.2
python-pyldap 3.0.0-1ubuntu0.2
python3-ldap 3.0.0-1ubuntu0.2
python3-pyldap 3.0.0-1ubuntu0.2

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5508-1
CVE-2021-46823

Package Information:
  https://launchpad.net/ubuntu/+source/python-ldap/3.2.0-4ubuntu7.1
  https://launchpad.net/ubuntu/+source/python-ldap/3.2.0-4ubuntu5.1
  https://launchpad.net/ubuntu/+source/python-ldap/3.2.0-4ubuntu2.1
  https://launchpad.net/ubuntu/+source/python-ldap/3.0.0-1ubuntu0.2