misp-stix vulnerabilities

A vulnerability in the misp-stix library stems from incomplete clearing of parser state between STIX document conversions. Reusing the same parser instance can cause data from a previously processed document (e.g., galaxies, DNS records, titles, timestamps) to be incorporated into the MISP event generated from a subsequent document. The issue affects both STIX 1 and STIX 2 parsers.

A denial-of-service vulnerability was identified in misp-stix when processing attacker-controlled STIX 1 or STIX 2 documents. The import code used sys.exit() to handle errors, causing unexpected process termination, and did not limit input size, leading to excessive memory and CPU consumption.

A vulnerability in misp-stix allows an attacker to supply a crafted STIX document that can influence security-sensitive MISP attribute metadata during import. The parser selection was based on untrusted indicators (tool labels or document title), enabling spoofing of MISP-origin content. Additionally, attributes from x-misp-object were copied without restrictions, allowing injection of unexpected fields.