CVE-2025-24359

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{"affected": [{"affectedData": [{"product": "asteval", "vendor": "lmfit", "versions": [{"status": "affected", "version": "< 1.0.6"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "ASTEVAL is an evaluator of Python expressions and statements. Prior to version 1.0.6, if an attacker can control the input to the `asteval` library, they can bypass asteval's restrictions and execute arbitrary Python code in the context of the application using the library. The vulnerability is rooted in how `asteval` performs handling of `FormattedValue` AST nodes. In particular, the `on_formattedvalue` value uses the dangerous format method of the str class. The code allows an attacker to manipulate the value of the string used in the dangerous call `fmt.format(__fstring__=val)`. This vulnerability can be exploited to access protected attributes by intentionally triggering an `AttributeError` exception. The attacker can then catch the exception and use its `obj` attribute to gain arbitrary access to sensitive or protected object properties. Version 1.0.6 fixes this issue."}, {"lang": "es", "value": "ASTEVAL es un evaluador de expresiones y declaraciones de Python. Antes de la versi\u00f3n 1.0.6, si un atacante pod\u00eda controlar la entrada de `asteval` librer\u00eda, pod\u00eda eludir las restricciones de asteval y ejecutar c\u00f3digo Python arbitrario en el contexto de la aplicaci\u00f3n utilizando tlibrer\u00edaary. La vulnerabilidad tiene su ra\u00edz en la forma en que `asteval` realiza el manejo de los nodos AST `FormattedValue`. En particular, el valor `on_formattedvalue` utiliza el m\u00e9todo de formato peligroso de la clase str. El c\u00f3digo permite a un atacante manipular el valor de la cadena utilizada en la llamada peligrosa `fmt.format(__fstring__=val)`. Esta vulnerabilidad se puede explotar para acceder a atributos protegidos activando intencionalmente una excepci\u00f3n `AttributeError`. El atacante puede entonces capturar la excepci\u00f3n y utilizar su atributo `obj` para obtener acceso arbitrario a propiedades de objetos confidenciales o protegidas. La versi\u00f3n 1.0.6 corrige este problema."}], "id": "CVE-2025-24359", "lastModified": "2026-06-17T08:58:46.247", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-24359", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-01-24T17:28:13.184358Z", "version": "2.0.3"}}]}, "published": "2025-01-24T17:15:16.197", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/lmfit/asteval/blob/cfb57f0beebe0dc0520a1fbabc35e66060c7ea71/asteval/asteval.py#L507"}, {"source": "security-advisories@github.com", "url": "https://github.com/lmfit/asteval/security/advisories/GHSA-3wwr-3g9f-9gc7"}, {"source": "security-advisories@github.com", "url": "https://lucumr.pocoo.org/2016/12/29/careful-with-str-format"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-134"}, {"lang": "en", "value": "CWE-749"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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