FKIE_CVE-2025-24359

Vulnerability from fkie_nvd - Published: 2025-01-24 17:15 - Updated: 2026-06-17 08:58
Severity
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/lmfit/asteval/blob/cfb57f0beebe0dc0520a1fbabc35e66060c7ea71/asteval/asteval.py#L507
security-advisories@github.comhttps://github.com/lmfit/asteval/security/advisories/GHSA-3wwr-3g9f-9gc7
security-advisories@github.comhttps://lucumr.pocoo.org/2016/12/29/careful-with-str-format
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "asteval",
          "vendor": "lmfit",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 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\u0027s 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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