CVE-2022-40083: Open redirect in github.com/labstack/echo/v4
Summary
CVE-2022-40083: Open redirect in github.com/labstack/echo/v4. Affects github.com/labstack/echo/v4 versions < 4.9.0. Fixed in 4.9.0. How to fix ↓
Also tracked for
- golang-github-labstack-echo · Debian:12
The same CVE-2022-40083 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
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Background
The github.com/labstack/echo/v4 package is a popular Go web framework that provides a lightweight and fast HTTP router with a focus on high performance and simplicity. It is widely used for building web applications and APIs. The package includes various components and features for handling HTTP requests and responses, including the Static Handler component, which is responsible for serving static files. Unfortunately, this component contains a vulnerability that allows for open redirects, which can be exploited to perform Server-Side Request Forgery (SSRF) attacks.
Vulnerability Detail
The open redirect vulnerability in github.com/labstack/echo/v4's Static Handler component allows an attacker to manipulate the URL and redirect users to arbitrary external websites. This can be leveraged to trick users into visiting malicious websites or performing unintended actions. The vulnerability arises from inadequate input validation and sanitization in the handling of user-supplied URLs. By crafting a specially crafted URL, an attacker can bypass the intended restrictions and redirect users to any desired location. This can lead to various security risks, including phishing attacks, malware distribution, and unauthorized access to sensitive information.
How To Fix
Latest published version: v4.16.1 as of 23 Oct 2026
go get github.com/labstack/echo/v4@v4.16.1Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
4.9.0
This is the first release that contains the fix.
go get github.com/labstack/echo/v4@v4.9.0Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If upgrading to the latest version is not immediately feasible, developers can implement a workaround by manually validating and sanitizing user-supplied URLs before passing them to the Static Handler component. This can be done by checking the URL against a whitelist of allowed domains or using a regular expression to ensure it conforms to the expected format. Here is an example of how this can be achieved in Go:
func sanitizeURL(url string) string {
// Perform URL validation and sanitization logic here
// Return the sanitized URL
}
func main() {
e := echo.New()
e.GET("/static", func(c echo.Context) error {
// Get the user-supplied URL
url := c.QueryParam("url")
// Sanitize the URL
sanitizedURL := sanitizeURL(url)
// Serve the sanitized URL using the Static Handler
return c.Redirect(http.StatusMovedPermanently, sanitizedURL)
})
e.Start(":8080")
}
Conclusion
The open redirect vulnerability in github.com/labstack/echo/v4's Static Handler component poses a significant security risk, as it allows attackers to manipulate URLs and redirect users to arbitrary external websites. To mitigate this vulnerability, developers should upgrade to version 4.9.0 or later of the package. If immediate upgrading is not possible, implementing a workaround by manually validating and sanitizing user-supplied URLs can provide temporary protection. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for github.com/labstack/echo/v4 →
FAQ
An open redirect vulnerability is a security flaw that allows an attacker to manipulate a URL and redirect users to arbitrary external websites. It occurs when a web application fails to properly validate and sanitize user-supplied URLs before using them in a redirect. This can be exploited to trick users into visiting malicious websites or performing unintended actions.
Server-Side Request Forgery (SSRF) is an attack technique that allows an attacker to make requests to internal resources or external systems from a vulnerable server. It occurs when a server blindly trusts user-supplied input and performs requests on behalf of the attacker. In the context of this vulnerability, an open redirect can be leveraged to perform SSRF attacks.
The open redirect vulnerability in github.com/labstack/echo/v4 can lead to various security risks, including:
- Phishing attacks: Attackers can redirect users to fake login pages or other malicious websites to steal their credentials.
- Malware distribution: Attackers can redirect users to websites hosting malware, leading to the installation of malicious software on their devices.
- Unauthorized access: Attackers can redirect users to internal resources or systems that should not be accessible, potentially leading to unauthorized access to sensitive information.
You can use the Vulert Playground at Vulert Scanner to check if your application is affected by this vulnerability. Simply provide your Gopkg.lock file, and Vulert will analyze it in real-time to identify any open-source vulnerabilities, including this one.
At the time of this report, there are no known public exploits specifically targeting this vulnerability in github.com/labstack/echo/v4. However, it is important to promptly address the vulnerability by upgrading to the latest version or implementing the provided workaround to mitigate the risk of exploitation.
References
Related vulnerabilities
Recent vulnerabilities recorded for github.com/labstack/echo/v4.
