Go Fiber CSRF Token Validation Vulnerability
A Cross-Site Request Forgery (CSRF) vulnerability has been identified in the application, which allows an attacker to obtain tokens and forge malicious requests on behalf of a user. This can lead to unauthorized actions being taken on the user's behalf, potentially compromising the security and integrity of the application.
Vulnerability Details
The vulnerability is caused by improper validation and enforcement of CSRF tokens within the application. The following issues were identified:
1. Lack of Token Association: The CSRF token was validated against tokens in storage but was not tied to the original requestor that generated it, allowing for token reuse.
Remediation
To remediate this vulnerability, it is recommended to take the following actions:
1. Update the Application: Upgrade the application to a fixed version with a patch for the vulnerability.
2. Implement Proper CSRF Protection: Review the updated documentation and ensure your application's CSRF protection mechanisms follow best practices.
4. Choose CSRF Protection Method: Select the appropriate CSRF protection method based on your application's requirements, either the Double Submit Cookie method or the Synchronizer Token Pattern using sessions.
5. Security Testing: Conduct a thorough security assessment, including penetration testing, to identify and address any other security vulnerabilities.
Defence-in-depth
Users should take additional security measures like captchas or Two-Factor Authentication (2FA) and set Session cookies with SameSite=Lax or SameSite=Strict, and the Secure and HttpOnly attributes.
CSRF Token Reuse Vulnerability
A Cross-Site Request Forgery (CSRF) vulnerability has been identified in the application, which allows an attacker to inject arbitrary values and forge malicious requests on behalf of a user. This vulnerability can allow an attacker to inject arbitrary values without any authentication, or perform various malicious actions on behalf of an authenticated user, potentially compromising the security and integrity of the application.
Vulnerability Details
The vulnerability is caused by improper validation and enforcement of CSRF tokens within the application. The following issues were identified:
1. Token Injection: For 'safe' methods, the token was extracted from the cookie and saved to storage without further validation or sanitization.
2. Lack of Token Association: The CSRF token was validated against tokens in storage but not associated with a session, nor by using a Double Submit Cookie Method, allowing for token reuse.
Specific Go Packages Affected
github.com/gofiber/fiber/v2/middleware/csrf
Remediation
To remediate this vulnerability, it is recommended to take the following actions:
1. Update the Application: Upgrade the application to a fixed version with a patch for the vulnerability.
2. Implement Proper CSRF Protection: Review the updated documentation and ensure your application's CSRF protection mechanisms follow best practices.
4. Choose CSRF Protection Method: Select the appropriate CSRF protection method based on your application's requirements, either the Double Submit Cookie method or the Synchronizer Token Pattern using sessions.
5. Security Testing: Conduct a thorough security assessment, including penetration testing, to identify and address any other security vulnerabilities.
Defence-in-depth
Users should take additional security measures like captchas or Two-Factor Authentication (2FA) and set Session cookies with SameSite=Lax or SameSite=Secure, and the Secure and HttpOnly attributes.
Go HTTP/2 rapid reset DoS
HTTP/2 server vulnerable to rapid stream reset attack causing denial of service.
x/net/html Vulnerable to DoS During HTML Parsing
The html package (aka x/net/html) through 2018-09-25 in Go mishandles <table><math><select><mi><select></table>, leading to an infinite loop during an html.Parse call because inSelectIM and inSelectInTableIM do not comply with a specification.
golang.org/x/net vulnerable to Uncontrolled Resource Consumption
A maliciously crafted HTTP/2 stream could cause excessive CPU consumption in the HPACK decoder, sufficient to cause a denial of service from a small number of small requests.
golang.org/x/crypto/ssh Man-in-the-Middle attack
The Go SSH library (golang.org/x/crypto/ssh) by default does not verify host keys, facilitating man-in-the-middle attacks if ClientConfig.HostKeyCallback is not set. Default behavior changed in commit e4e2799 to require explicitly registering a hostkey verification mechanism.
golang.org/x/net/http2/h2c vulnerable to request smuggling attack
A request smuggling attack is possible when using MaxBytesHandler. When using MaxBytesHandler, the body of an HTTP request is not fully consumed. When the server attempts to read HTTP2 frames from the connection, it will instead be reading the body of the HTTP request, which could be attacker-manipulated to represent arbitrary HTTP2 requests.
Specific Go Packages Affected
golang.org/x/net/http2/h2c
Go net/netip IPv4-mapped IPv6 misclassification — SSRF bypass
Go stdlib misclassified IPv4-mapped IPv6 addresses as loopback/private, enabling SSRF and IP allowlist bypasses.
