{
    "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-39228",
        "STATE": "PUBLIC",
        "TITLE": "Memory Safety Issue when using patch or merge on state and assign the result back to state"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "tremor-runtime",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "> 0.7.2, < 0.11.6"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "tremor-rs"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Tremor is an event processing system for unstructured data. A vulnerability exists between versions 0.7.2 and 0.11.6. This vulnerability is a memory safety Issue when using `patch` or `merge` on `state` and assign the result back to `state`. In this case, affected versions of Tremor and the tremor-script crate maintains references to memory that might have been freed already. And these memory regions can be accessed by retrieving the `state`, e.g. send it over TCP or HTTP. This requires the Tremor server (or any other program using tremor-script) to execute a tremor-script script that uses the mentioned language construct. The issue has been patched in version 0.11.6 by removing the optimization and always cloning the target expression of a Merge or Patch. If an upgrade is not possible, a possible workaround is to avoid the optimization by introducing a temporary variable and not immediately reassigning to `state`."
            }
        ]
    },
    "impact": {
        "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-416: Use After Free"
                    }
                ]
            },
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-825: Expired Pointer Dereference"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://github.com/tremor-rs/tremor-runtime/security/advisories/GHSA-mc22-5q92-8v85",
                "refsource": "CONFIRM",
                "url": "https://github.com/tremor-rs/tremor-runtime/security/advisories/GHSA-mc22-5q92-8v85"
            },
            {
                "name": "https://github.com/tremor-rs/tremor-runtime/pull/1217",
                "refsource": "MISC",
                "url": "https://github.com/tremor-rs/tremor-runtime/pull/1217"
            },
            {
                "name": "https://github.com/tremor-rs/tremor-runtime/commit/1a2efcdbe68e5e7fd0a05836ac32d2cde78a0b2e",
                "refsource": "MISC",
                "url": "https://github.com/tremor-rs/tremor-runtime/commit/1a2efcdbe68e5e7fd0a05836ac32d2cde78a0b2e"
            },
            {
                "name": "https://github.com/tremor-rs/tremor-runtime/releases/tag/v0.11.6",
                "refsource": "MISC",
                "url": "https://github.com/tremor-rs/tremor-runtime/releases/tag/v0.11.6"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-mc22-5q92-8v85",
        "discovery": "UNKNOWN"
    }
}