CVE-2025-59050

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{"affected": [{"affectedData": [{"product": "greenshot", "vendor": "greenshot", "versions": [{"status": "affected", "version": "< 1.3.301"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:getgreenshot:greenshot:*:*:*:*:*:*:*:*", "matchCriteriaId": "686A0D0C-A956-46F9-A83D-AA19786DECAA", "versionEndExcluding": "1.3.301", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Greenshot is an open source Windows screenshot utility. Greenshot 1.3.300 and earlier deserializes attacker-controlled data received in a WM_COPYDATA message using BinaryFormatter.Deserialize without prior validation or authentication, allowing a local process at the same integrity level to trigger arbitrary code execution inside the Greenshot process. The vulnerable logic resides in a WinForms WndProc handler for WM_COPYDATA (message 74) that copies the supplied bytes into a MemoryStream and invokes BinaryFormatter.Deserialize, and only afterward checks whether the specified channel is authorized. Because the authorization check occurs after deserialization, any gadget chain embedded in the serialized payload executes regardless of channel membership. A local attacker who can send WM_COPYDATA to the Greenshot main window can achieve in-process code execution, which may aid evasion of application control policies by running payloads within the trusted, signed Greenshot.exe process. This issue is fixed in version 1.3.301. No known workarounds exist."}, {"lang": "es", "value": "Greenshot es una utilidad de captura de pantalla de c\u00f3digo abierto para Windows. Greenshot 1.3.300 y versiones anteriores deserializa datos controlados por el atacante recibidos en un mensaje WM_COPYDATA usando BinaryFormatter.Deserialize sin validaci\u00f3n o autenticaci\u00f3n previa, permitiendo que un proceso local con el mismo nivel de integridad desencadene la ejecuci\u00f3n de c\u00f3digo arbitrario dentro del proceso de Greenshot. La l\u00f3gica vulnerable reside en un gestor WndProc de WinForms para WM_COPYDATA (mensaje 74) que copia los bytes suministrados en un MemoryStream e invoca BinaryFormatter.Deserialize, y solo despu\u00e9s verifica si el canal especificado est\u00e1 autorizado. Debido a que la verificaci\u00f3n de autorizaci\u00f3n ocurre despu\u00e9s de la deserializaci\u00f3n, cualquier cadena de gadgets incrustada en la carga \u00fatil serializada se ejecuta independientemente de la membres\u00eda del canal. Un atacante local que puede enviar WM_COPYDATA a la ventana principal de Greenshot puede lograr la ejecuci\u00f3n de c\u00f3digo en proceso, lo que puede ayudar a la evasi\u00f3n de las pol\u00edticas de control de aplicaciones al ejecutar cargas \u00fatiles dentro del proceso confiable y firmado Greenshot.exe. Este problema est\u00e1 solucionado en la versi\u00f3n 1.3.301. No existen soluciones alternativas conocidas."}], "id": "CVE-2025-59050", "lastModified": "2026-10-19T17:10:00.173", "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"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-59050", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-09-16T17:29:53.576216Z", "version": "2.0.3"}}]}, "published": "2025-09-16T17:15:41.433", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/greenshot/greenshot/commit/f5a29a2ed3b0eb49231c0f4618300f488cf1b04d"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/greenshot/greenshot/security/advisories/GHSA-8f7f-x7ww-xx5w"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/greenshot/greenshot/security/advisories/GHSA-8f7f-x7ww-xx5w"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-502"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"created": "2025-09-17T10:04:27.723920+00:00", "updated": "2025-09-17T10:04:27.723954+00:00", "vendors": ["greenshot", "greenshot$PRODUCT$greenshot", "microsoft", "microsoft$PRODUCT$windows"]}