The HTTP/1 client in Golang contains a vulnerability due to inadequate validation of the Host header. Specifically, this vulnerability allows a maliciously crafted Host header to inject additional headers or even entire requests. This issue is critical as it can lead to unauthorized actions and data integrity issues. The fix implemented ensures that the HTTP/1 client rejects requests that contain an invalid Request.Host or Request.URL.Host value.
With a CVSS score of 6.5, classified as medium severity, this vulnerability poses a tangible risk to organizations using affected versions of Golang’s HTTP client. The required user interaction further complicates the risk scenario, as attackers may leverage social engineering to exploit this vulnerability.
Organizations should prioritize patching immediately, as the implications of this vulnerability could allow unauthorized users to manipulate requests, impacting data integrity and application behavior.
The urgency for remediation is heightened given the potential for exploitation, although there is currently no known active exploitation. However, the presence of a proof of concept on GitHub indicates that this vulnerability is recognized within the community.
For organizations leveraging Golang, understanding this vulnerability and its implications is crucial for maintaining the security and integrity of their applications.
Vulnerability Details
The described vulnerability arises from the HTTP/1 client not fully validating the Host header. The official description states, 'The HTTP/1 client does not fully validate the contents of the Host header. A maliciously crafted Host header can inject additional headers or entire requests.' The vulnerability is classified under CWE-436, indicating a lack of sufficient validation.
The CVSS score for this vulnerability is 6.5, indicating medium severity. The factors contributing to this score include an attack vector classified as NETWORK, low attack complexity, and the requirement for user interaction to exploit the vulnerability.
The following versions of the Golang Go product are affected: All versions prior to 1.19.11 and versions from 1.20.0 to 1.20.6. The vulnerability was published on July 11, 2023.
Technical Analysis
The root cause of this vulnerability is the improper handling of the Host header within the HTTP/1 client in Golang. This flaw allows an attacker who can manipulate the Host header to perform actions such as injecting additional headers or even crafting full requests that could be processed by the server.
The attack vector is network-based, meaning exploitation could be carried out remotely without physical access. The attack complexity is categorized as low, indicating that an attacker with minimal skill could exploit the vulnerability, especially since user interaction is required to trigger the vulnerable state.
The exploitation of this vulnerability does not require any privileges, but it does involve user interaction. Should an attack succeed, the integrity impact is rated as high, as unauthorized modifications could occur without detection. However, there is no impact on confidentiality or availability, which limits the overall severity of potential attacks.
Risk & Impact Analysis
Organizations using the affected versions of Golang's HTTP client face real-world risks associated with potential integrity violations. The ability for attackers to manipulate request headers could lead to further exploits, potentially affecting downstream services or applications relying on this client.
The blast radius for this vulnerability can be significant, depending on the context of the application. If a compromised request is processed without validation, it could lead to unauthorized actions or data alterations.
Given the CVSS score of 6.5, organizations should address this vulnerability in their priority patch cycle. Although there is currently no known active exploitation, the potential for future attacks remains, especially with proof of concept code available.
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of Golang's Go prior to 1.19.11 and versions ranging from 1.20.0 to 1.20.6. Organizations should ensure they update to the patched versions to mitigate potential risks.
Mitigation & Remediation
To mitigate the risks associated with CVE-2023-29406, organizations should update their Golang installations to the latest versions. Specifically, they should upgrade to versions 1.19.11 or 1.20.6 or later. For those unable to upgrade immediately, implementing input validation and sanitization of the Host header can serve as a temporary workaround.
Additionally, organizations are encouraged to enhance their network controls to limit exposure to potentially malicious requests and monitor for any unusual behavior indicative of exploitation attempts.
For further guidance on securing applications, organizations can refer to resources on application security assessment and ensure rigorous testing practices are in place.
Detection Guidance
Organizations should monitor their logs for indicators of exploitation attempts related to the manipulation of the Host header. Behavioral anomalies such as unexpected requests or modifications in request patterns should be tracked closely.
Additionally, network signatures can be established to detect unusual traffic patterns indicative of potential exploitation. Regular audits of application behavior can also help identify any unauthorized changes or impacts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-29406 lies in its reminder of the importance of input validation in web applications. This vulnerability exemplifies how insufficient validation can lead to severe integrity issues, underlining the need for thorough security reviews during software development.
Current trends in vulnerability disclosures highlight the necessity for proactive security measures, especially in popular frameworks like Golang. Security teams should prioritize robust testing, including regular penetration testing and vulnerability assessments, to identify and remediate weaknesses before they can be exploited.
For further insights on vulnerability management, organizations can benefit from reviewing our vulnerability management program to enhance their overall security posture.
Additionally, organizations should implement continuous security practices, including continuous penetration testing, to ensure ongoing protection against emerging threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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