[MISP] Handle case where MISP Distribution and Threat Level IDs are of type int

[gbikram]

Description

Connector Name: MISP
URL: https://github.com/OpenCTI-Platform/connectors/tree/master/external-import/misp

• Lines 621-640 assume that event["Event"]["distribution"] and event["Event"]["threat_level_id"] will be of type str always.
• However, certain MISP servers return these attributes as int type.
• This leads to incorrect results from the comparison operations carried out on lines 621 and 631 (always True).
• Additionally, the log_info operations within the comparisons result in exceptions due to incorrect types being concatenated (str + int).

Expected Output

In case a MISP server returns the above properties as int, the connector should convert them to str.

Actual Output

Exception is raised due to incorrect types being concatenated.

Proposed Fix

Cast event["Event"]["distribution"] and event["Event"]["threat_level_id"] within str:

if (
    import_distribution_levels is not None
    and str(event["Event"]["distribution"]) not in import_distribution_levels       # FIX:Cast as str
):
    self.helper.log_info(
        "Event distribution level "
        + str(event["Event"]["distribution"])                                       # FIX:Cast as str
        + " not in import_distribution_levels, do not import"
    )
    continue
if (
    import_threat_levels is not None
    and str(event["Event"]["threat_level_id"]) not in import_threat_levels          # FIX:Cast as str
):
    self.helper.log_info(
        "Event threat level "
        + str(event["Event"]["threat_level_id"])                                    # FIX:Cast as str
        + " not in import_threat_levels, do not import"
    )
    continue