CVE-2024-45302

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The second argument to `RestRequest.AddHeader` (the header value) is vulnerable to CRLF injection. The same applies to `RestRequest.AddOrUpdateHeader` and `RestClient.AddDefaultHeader`. The way HTTP headers are added to a request is via the `HttpHeaders.TryAddWithoutValidation` method which does not check for CRLF characters in the header value. This means that any headers from a `RestSharp.RequestHeaders` object are added to the request in such a way that they are vulnerable to CRLF-injection. In general, CRLF-injection into a HTTP header (when using HTTP/1.1) means that one can inject additional HTTP headers or smuggle whole HTTP requests. If an application using the RestSharp library passes a user-controllable value through to a header, then that application becomes vulnerable to CRLF-injection. This is not necessarily a security issue for a command line application like the one above, but if such code were present in a web application then it becomes vulnerable to request splitting (as shown in the PoC) and thus Server Side Request Forgery. Strictly speaking this is a potential vulnerability in applications using RestSharp, not in RestSharp itself, but I would argue that at the very least there needs to be a warning about this behaviour in the RestSharp documentation. RestSharp has addressed this issue in version 112.0.0. All users are advised to upgrade. There are no known workarounds for this vulnerability."}, {"lang": "es", "value": "RestSharp es un cliente de API HTTP y REST simple para .NET. El segundo argumento de `RestRequest.AddHeader` (el valor del encabezado) es vulnerable a la inyecci\u00f3n CRLF. Lo mismo se aplica a `RestRequest.AddOrUpdateHeader` y `RestClient.AddDefaultHeader`. La forma en que se agregan los encabezados HTTP a una solicitud es a trav\u00e9s del m\u00e9todo `HttpHeaders.TryAddWithoutValidation` que no verifica los caracteres CRLF en el valor del encabezado. Esto significa que cualquier encabezado de un objeto `RestSharp.RequestHeaders` se agrega a la solicitud de tal manera que es vulnerable a la inyecci\u00f3n CRLF. En general, la inyecci\u00f3n CRLF en un encabezado HTTP (cuando se usa HTTP/1.1) significa que uno puede inyectar encabezados HTTP adicionales o contrabandear solicitudes HTTP completas. Si una aplicaci\u00f3n que usa la librer\u00eda RestSharp pasa un valor controlable por el usuario a un encabezado, entonces esa aplicaci\u00f3n se vuelve vulnerable a la inyecci\u00f3n CRLF. Esto no es necesariamente un problema de seguridad para una aplicaci\u00f3n de l\u00ednea de comandos como la anterior, pero si dicho c\u00f3digo estuviera presente en una aplicaci\u00f3n web, se volver\u00eda vulnerable a la divisi\u00f3n de solicitudes (como se muestra en la PoC) y, por lo tanto, a la falsificaci\u00f3n de solicitudes del lado del servidor. Estrictamente hablando, esta es una vulnerabilidad potencial en aplicaciones que usan RestSharp, no en RestSharp en s\u00ed, pero yo dir\u00eda que, como m\u00ednimo, deber\u00eda haber una advertencia sobre este comportamiento en la documentaci\u00f3n de RestSharp. RestSharp ha abordado este problema en la versi\u00f3n 112.0.0. Se recomienda a todos los usuarios que actualicen. No existen workarounds para esta vulnerabilidad."}], "id": "CVE-2024-45302", "lastModified": "2026-06-17T07:53:59.057", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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-2024-45302", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-08-30T14:54:23.955865Z", "version": "2.0.3"}}]}, "published": "2024-08-29T22:15:05.377", "references": [{"source": "security-advisories@github.com", "tags": ["Issue Tracking"], "url": "https://github.com/restsharp/RestSharp/blob/777bf194ec2d14271e7807cc704e73ec18fcaf7e/src/RestSharp/Request/HttpRequestMessageExtensions.cs#L32"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/restsharp/RestSharp/commit/0fba5e727d241b1867bd71efc912594075c2934b"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/restsharp/RestSharp/security/advisories/GHSA-4rr6-2v9v-wcpc"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-93"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-74"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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