GHSA-r8wq-qrxc-hmcm

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GHSA-r8wq-qrxc-hmcm

Summary: ReDoS in LDAP schema parser

Details: 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](https://cwe.mitre.org/data/definitions/1333.html) ### For more information If you have any questions or comments about this advisory: * Open an issue in [python-ldap](https://github.com/python-ldap/python-ldap) tracker

References: https://github.com/python-ldap/python-ldap/security/advisories/GHSA-r8wq-qrxc-hmcm, https://github.com/python-ldap/python-ldap/issues/424, https://github.com/python-ldap/python-ldap