Description

ReDoS in LDAP schema parser https://github.com/python-ldap/python-ldap/issues/424

Impact

The LDAP schema parser of python-ldap 3.3.1 and earlier are vulnerable to a regular expression denial-of-service attack. The issue affects clients that use ldap.schema package to parse LDAP schema definitions from an untrusted source.

Patches

The upcoming release of python-ldap 3.4.0 will contain a workaround to prevent ReDoS attacks. The schema parser refuses schema definitions with an excessive amount of backslashes.

Workarounds

As a workaround, users can check input for excessive amount of backslashes in schemas. More than a dozen backslashes per line are atypical.

References

CWE-1333

For more information

If you have any questions or comments about this advisory:

Open an issue in python-ldap tracker

Mitigation

Aliases

References