openldap: Denial of service vulnerability in filter.c (CVE-2020-12243)

In filter.c in slapd in OpenLDAP before 2.4.50, LDAP search filters with nested boolean expressions can result in denial of service (daemon crash).

Reference:

• https://nvd.nist.gov/vuln/detail/CVE-2020-12243
• https://bugs.openldap.org/show_bug.cgi?id=9202

Patch:

https://git.openldap.org/openldap/openldap/-/commit/98464c11df8247d6a11b52e294ba5dd4f0380440

Affected branches:

• master
• 3.11-stable
• 3.10-stable
• 3.9-stable
• 3.8-stable