RestSharp, a popular Simple REST and HTTP API Client for .NET, has a vulnerability classified as CVE-2024-45302. This vulnerability allows for CRLF injection, specifically targeting the second argument to `RestRequest.AddHeader`, as well as related methods like `RestRequest.AddOrUpdateHeader` and `RestClient.AddDefaultHeader`. The vulnerability arises because the method `HttpHeaders.TryAddWithoutValidation` does not validate the presence of CRLF characters in header values.
The implications of this vulnerability are significant. CRLF injection can allow an attacker to inject additional HTTP headers or even smuggle entire HTTP requests. If an application using RestSharp accepts user-controllable values for headers, it becomes susceptible to these attacks. While this may not pose a risk for command-line applications, it becomes critical in web applications where request splitting can lead to Server Side Request Forgery (SSRF).
RestSharp has addressed this issue in version 112.0.0. All users are advised to upgrade promptly as there are no known workarounds. Given the potential for exploitation, organizations should evaluate their use of RestSharp and prioritize upgrading to the latest version.
Risk to organizations includes exposure to unauthorized access and manipulation of server responses. Organizations should prioritize patching immediately.
Vulnerability Details
CVE-2024-45302 is classified as a medium-severity vulnerability with a CVSS score of 6.1, indicating a moderate risk. The vulnerability is identified as CRLF injection, which is a type of input validation flaw. It affects the RestSharp library, specifically versions prior to 112.0.0. This vulnerability was published on August 29, 2024.
Technical Analysis
The root cause of the vulnerability is the improper handling of CRLF characters in HTTP headers. Attackers may exploit this by injecting headers into requests, which can lead to various attack scenarios, including request splitting and SSRF.
The attack vector is local, requiring the attacker to have some access to the application using RestSharp. The attack complexity is low, as it does not require any special conditions beyond user interaction to exploit. No privileges are required to carry out the attack, but user interaction is necessary. The impact on confidentiality is low, while integrity is unaffected. However, the availability impact is high, potentially leading to service disruptions.
Risk & Impact Analysis
Organizations using RestSharp should assess the risk of this vulnerability within their applications. The potential for exploitation is significant, especially in web applications where an attacker can manipulate requests. The blast radius includes any service that relies on RestSharp for HTTP communication. Given the CVSS score of 6.1, organizations should address this vulnerability in their priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The versions of RestSharp affected by this vulnerability are those prior to 112.0.0. Users are strongly encouraged to upgrade to this version to mitigate the risk associated with this flaw.
Mitigation & Remediation
To mitigate this vulnerability, organizations should upgrade to RestSharp version 112.0.0 or later. There are no known workarounds for this issue, making upgrading the only effective solution. Additionally, organizations can implement input validation mechanisms to sanitize user inputs before passing them to RestSharp methods.
For further assistance, organizations may consider consulting with security experts to evaluate their application security posture and ensure compliance with security best practices. Engaging in penetration testing can also help uncover and remediate vulnerabilities.
Detection Guidance
Organizations should monitor their applications for unusual behavior related to HTTP requests. Key indicators include unexpected HTTP headers being sent or malformed requests. Implementation of logging and monitoring tools can assist in detecting such anomalies.
AppSecure Threat Intelligence Insight
This vulnerability highlights the importance of thorough input validation in libraries that handle user inputs for HTTP headers. As web applications increasingly rely on third-party libraries, it is crucial for developers to stay abreast of potential vulnerabilities in these dependencies. Regular security assessments and updates are essential to maintaining a robust security posture.
For more information on securing your applications, organizations can consult our penetration testing methodology guide. Additionally, understanding the implications of CRLF injection can aid in developing better security practices, which can be found in our API security testing tools resources.
In summary, organizations leveraging RestSharp should act promptly to upgrade and mitigate the risks associated with CVE-2024-45302.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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