Description
python-ldap is a lightweight directory access protocol (LDAP) client API for Python. In versions prior to 3.4.5, the sanitization method `ldap.filter.escape_filter_chars` can be tricked to skip escaping of special characters when a crafted `list` or `dict` is supplied as the `assertion_value` parameter, and the non-default `escape_mode=1` is configured. The method `ldap.filter.escape_filter_chars` supports 3 different escaping modes. `escape_mode=0` (default) and `escape_mode=2` happen to raise exceptions when a `list` or `dict` object is supplied as the `assertion_value` parameter. However, `escape_mode=1` computes without performing adequate logic to ensure a fully escaped return value. If an application relies on the vulnerable method in the `python-ldap` library to escape untrusted user input, an attacker might be able to abuse the vulnerability to launch ldap injection attacks which could potentially disclose or manipulate ldap data meant to be inaccessible to them. Version 3.4.5 fixes the issue by adding a type check at the start of the `ldap.filter.escape_filter_chars` method to raise an exception when the supplied `assertion_value` parameter is not of type `str`.
Problem types
CWE-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection)
CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')
Product status
References
github.com/...n-ldap/security/advisories/GHSA-r7r6-cc7p-4v5m
github.com/...ommit/3957526fb1852e84b90f423d9fef34c7af25b85a
github.com/...dap/python-ldap/releases/tag/python-ldap-3.4.5
