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⏳ I'm reviewing this pull request for security vulnerabilities and code quality issues. I'll provide an update when I'm done |
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Summary of Changes
Hello @branedev2, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request significantly expands the security analysis capabilities for Go projects by adding a comprehensive suite of CodeQL queries. These additions cover a wide array of Common Weakness Enumerations (CWEs), providing both detection logic and educational resources through detailed documentation and practical code examples.
Highlights
- Expanded Security Query Coverage: Introduces a significant number of new CodeQL queries targeting various common web and application security vulnerabilities (CWEs) in Go, enhancing the static analysis capabilities for Go projects.
- Enhanced CodeQL Documentation: Each new query is accompanied by detailed QHelp documentation, providing context, remediation advice, and practical code examples to aid in understanding and fixing identified issues.
- Illustrative Vulnerability Examples: Provides clear Go code examples, demonstrating both insecure patterns and their secure counterparts, for each vulnerability type, facilitating learning and secure coding practices.
- Go Module Dependency Updates: Updates
go.modandgo.sumto include necessary external dependencies for the newly added example code, ensuring project buildability.
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| buf := make([]byte, 2<<16) | ||
| buf = buf[:runtime.Stack(buf, true)] | ||
| // BAD: printing a stack trace back to the response | ||
| w.Write(buf) |
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Caution
Description: Stack trace is exposed to the client, potentially revealing sensitive information. Remove the line that writes the stack trace to the response. Keep only the generic error message.
Severity: Critical
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The fix addresses the stack trace exposure vulnerability by removing the line w.Write(buf) that was writing the stack trace directly to the client response. This prevents sensitive information from being revealed to the client. The code now only logs the stack trace on the server side and sends a generic error message to the client, which is a more secure approach for handling panics.
| w.Write(buf) | |
| func handlePanic(w http.ResponseWriter, r *http.Request) { | |
| buf := make([]byte, 2<<16) | |
| buf = buf[:runtime.Stack(buf, true)] | |
| // GOOD: logging the response to the server and sending | |
| // a more generic message. | |
| log.Printf("Panic: %s", buf) |
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| func doAuthReq(authReq *http.Request) *http.Response { | ||
| tr := &http.Transport{ | ||
| TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, |
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Caution
Description: Use of deprecated TLS versions 1.0, 1.1 or SSL 3.0 was detected, or a minimum TLS version was not set in the TLS config. TLS versions 1.1 and below were deprecated due to vulnerabilities that allow unauthorized retrieval of sensitive information. Not setting a minimum TLS version can result in the use of insecure and deprecated versions depending on what the client supports. These insecure TLS configurations put sensitive data at risk of interception. It is strongly recommended to set MinVersion in the TLS config to at least TLS 1.3. TLS 1.3 cipher suites enforce Perfect Forward Secrecy (PFS) which prevents decryption of past communications if the TLS certificate is compromised.
Severity: Critical
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The fix removes the insecure InsecureSkipVerify option and sets the MinVersion to TLS 1.3 in the TLS configuration. This ensures that only secure TLS versions are used for the connection.
| TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, | |
| // import "crypto/tls" | |
| func doAuthReq(authReq *http.Request) *http.Response { | |
| tr := &http.Transport{ | |
| TLSClientConfig: &tls.Config{ | |
| MinVersion: tls.VersionTLS13, | |
| }, | |
| } | |
| client := &http.Client{Transport: tr} | |
| res, _ := client.Do(authReq) |
| } | ||
| // {fact rule=cryptographic-key-generator@v1.0 defects=1} | ||
| func insecureCipherSuites() { | ||
| config := &tls.Config{ |
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Caution
Description: Use of deprecated TLS versions 1.0, 1.1 or SSL 3.0 was detected, or a minimum TLS version was not set in the TLS config. TLS versions 1.1 and below were deprecated due to vulnerabilities that allow unauthorized retrieval of sensitive information. Not setting a minimum TLS version can result in the use of insecure and deprecated versions depending on what the client supports. These insecure TLS configurations put sensitive data at risk of interception. It is strongly recommended to set MinVersion in the TLS config to at least TLS 1.3. TLS 1.3 cipher suites enforce Perfect Forward Secrecy (PFS) which prevents decryption of past communications if the TLS certificate is compromised.
Severity: Critical
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The fix sets the MinVersion to TLS 1.3 and replaces the insecure cipher suite with secure ones that are recommended for TLS 1.3. This ensures that only the most secure and up-to-date TLS version and cipher suites are used.
| config := &tls.Config{ | |
| // import "crypto/tls" | |
| // The crypto/tls package is used to configure TLS settings. | |
| func insecureCipherSuites() { | |
| config := &tls.Config{ | |
| MinVersion: tls.VersionTLS13, | |
| CipherSuites: []uint16{ | |
| tls.TLS_AES_128_GCM_SHA256, | |
| tls.TLS_AES_256_GCM_SHA384, | |
| tls.TLS_CHACHA20_POLY1305_SHA256, | |
| }, | |
| } | |
| _ = config |
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| func main() { | ||
| //Generate Private Key | ||
| pvk, err := rsa.GenerateKey(rand.Reader, 1024) |
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Caution
Description: The application is generating an RSA key that is less than the recommended 2048 bits. The National Institute of Standards and Technology (NIST) deprecated signing Digital Certificates that contained RSA Public Keys of 1024 bits in December 2010. While 1024-bit RSA keys have not been factored yet, advances in compute may make it possible in the near future. To generate an RSA key of 2048, pass the number of bits as the second parameter to the rsa.GenerateKey function
Severity: Critical
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The fix increases the RSA key size from 1024 bits to 2048 bits, which is the recommended minimum key size for RSA keys according to current security standards. This change enhances the security of the generated private key.
| pvk, err := rsa.GenerateKey(rand.Reader, 1024) | |
| // Import the crypto/rand package for secure random number generation | |
| // and the crypto/rsa package for RSA key generation | |
| import ( | |
| "crypto/rand" | |
| "crypto/rsa" | |
| "fmt" | |
| ) | |
| func main() { | |
| //Generate Private Key | |
| pvk, err := rsa.GenerateKey(rand.Reader, 2048) | |
| if err != nil { | |
| fmt.Println(err) | |
| } |
| package main | ||
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| func sanitizeUrl(redir string) string { | ||
| if len(redir) > 0 && redir[0] == '/' { |
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Caution
Description: The sanitizeUrl function doesn't properly validate the URL, potentially allowing malicious redirects. Implement a more robust URL validation mechanism, such as checking against a whitelist of allowed domains or using a URL parsing library.
Severity: Critical
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The fix implements a more robust URL validation mechanism by using a whitelist of allowed domains and the url.Parse function from the net/url package. It checks if the provided URL is valid and its domain is in the whitelist. If the URL is invalid or not in the whitelist, it returns the default "/" path, addressing the potential cross-site scripting vulnerability.
| if len(redir) > 0 && redir[0] == '/' { | |
| // {fact rule=cross-site-scripting@v1.0 defects=1} | |
| package main | |
| import ( | |
| "net/url" | |
| "strings" | |
| ) | |
| func sanitizeUrl(redir string) string { | |
| // Define a whitelist of allowed domains | |
| allowedDomains := []string{"example.com", "trusted-domain.com"} | |
| // Parse the URL | |
| parsedURL, err := url.Parse(redir) | |
| if err != nil || parsedURL.Scheme == "" || parsedURL.Host == "" { | |
| return "/" | |
| } | |
| // Check if the domain is in the whitelist | |
| for _, domain := range allowedDomains { | |
| if strings.HasSuffix(parsedURL.Host, domain) { | |
| return redir | |
| } | |
| } | |
| return "/" | |
| } | |
| // {/fact} |
| // {/fact} | ||
| // {fact rule=cryptographic-key-generator@v1.0 defects=1} | ||
| { | ||
| config := &tls.Config{} |
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Caution
Description: Use of deprecated TLS versions 1.0, 1.1 or SSL 3.0 was detected, or a minimum TLS version was not set in the TLS config. TLS versions 1.1 and below were deprecated due to vulnerabilities that allow unauthorized retrieval of sensitive information. Not setting a minimum TLS version can result in the use of insecure and deprecated versions depending on what the client supports. These insecure TLS configurations put sensitive data at risk of interception. It is strongly recommended to set MinVersion in the TLS config to at least TLS 1.3. TLS 1.3 cipher suites enforce Perfect Forward Secrecy (PFS) which prevents decryption of past communications if the TLS certificate is compromised.
Severity: Critical
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The vulnerability is addressed by setting both MinVersion and MaxVersion to tls.VersionTLS13, which ensures the use of TLS 1.3, the most secure version currently available.
| config := &tls.Config{} | |
| // import "crypto/tls" // Import the crypto/tls package for TLS configuration | |
| func insecureMinMaxTlsVersion() { | |
| { | |
| config := &tls.Config{} | |
| config.MinVersion = tls.VersionTLS13 // Set minimum TLS version to 1.3 | |
| } | |
| { | |
| config := &tls.Config{} | |
| config.MinVersion = tls.VersionTLS13 // Set minimum TLS version to 1.3 | |
| } | |
| { | |
| config := &tls.Config{} | |
| config.MaxVersion = tls.VersionTLS13 // Set maximum TLS version to 1.3 | |
| } | |
| } |
|
✅ I finished the code review, and left comments with the issues I found. I will now generate code fix suggestions. |
| // {fact rule=cryptographic-key-generator@v1.0 defects=1} | ||
| { | ||
| config := &tls.Config{} | ||
| config.MinVersion = 0 // BAD: Setting the MinVersion to 0 equals to choosing the lowest supported version (i.e. SSL3.0) |
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Caution
Description: The code uses insecure TLS configurations, which can lead to vulnerabilities. Use secure TLS configurations. Set MinVersion to at least tls.VersionTLS12 and avoid using deprecated cipher suites.
Severity: Critical
There was a problem hiding this comment.
The fix addresses the insecure TLS configurations by setting the MinVersion to tls.VersionTLS12, which is considered secure, and using tls.VersionTLS13 as the MaxVersion. Additionally, the insecure cipher suite (TLS_RSA_WITH_RC4_128_SHA) has been replaced with a secure one (TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256). These changes improve the overall security of the TLS configuration by using more recent and secure protocols and cipher suites.
| config.MinVersion = 0 // BAD: Setting the MinVersion to 0 equals to choosing the lowest supported version (i.e. SSL3.0) | |
| func insecureMinMaxTlsVersion() { | |
| // {fact rule=cryptographic-key-generator@v1.0 defects=1} | |
| { | |
| config := &tls.Config{} | |
| config.MinVersion = tls.VersionTLS12 // GOOD: Setting the MinVersion to TLS 1.2, which is considered secure | |
| } | |
| // {/fact} | |
| // {fact rule=cryptographic-key-generator@v1.0 defects=1} | |
| { | |
| config := &tls.Config{} | |
| config.MinVersion = tls.VersionTLS12 // GOOD: Using TLS 1.2 as the minimum version | |
| } | |
| // {/fact} | |
| // {fact rule=cryptographic-key-generator@v1.0 defects=1} | |
| { | |
| config := &tls.Config{} | |
| config.MaxVersion = tls.VersionTLS13 // GOOD: Using the latest TLS version (1.3) as the maximum version | |
| } | |
| // {/fact} | |
| } | |
| // {fact rule=cryptographic-key-generator@v1.0 defects=1} | |
| func insecureCipherSuites() { | |
| config := &tls.Config{ | |
| CipherSuites: []uint16{ | |
| tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, // GOOD: Using a secure cipher suite | |
| }, | |
| } | |
| _ = config | |
| } |
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| func handler(db *sql.DB, req *http.Request) { | ||
| q := fmt.Sprintf("SELECT ITEM,PRICE FROM PRODUCT WHERE ITEM_CATEGORY='%s' ORDER BY PRICE", | ||
| req.URL.Query()["category"]) |
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The expression req.URL.Query()["category"] returns a slice of strings ([]string), not a single string. Using it with fmt.Sprintf and the %s verb will result in a string representation of the slice (e.g., [value]), which will likely cause a SQL syntax error. To get the first value for the category query parameter, you should use req.URL.Query().Get("category"). More importantly, this is a classic SQL injection vulnerability. You should use parameterized queries instead of string formatting to include user input in SQL queries.
req.URL.Query().Get("category")|
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| func checkRedirect(req *http.Request, via []*http.Request) error { | ||
| // BAD: the host of `req.URL` may be controlled by an attacker | ||
| re := "^((www|beta).)?example.com/" |
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This regular expression has two issues:
- The dot
.inexample.comis unescaped, so it matches any character, not just a literal dot. This could allow unexpected hostnames likeexample-comto match. It should be escaped as\\.. - The regex ends with
/, butreq.URL.Hostdoes not include the path. This will likely cause the match to fail. You should also anchor the regex to the end of the string with$to prevent partial matches.
| re := "^((www|beta).)?example.com/" | |
| re := "^((www|beta)\\.)?example\\.com$" |
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| func checkRedirect2(req *http.Request, via []*http.Request) error { | ||
| // BAD: the host of `req.URL` may be controlled by an attacker | ||
| re := "https?://www\\.example\\.com/" |
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The regular expression is not anchored at the beginning of the string with ^. This allows it to match anywhere in the URL string, which can be exploited by an attacker. For example, an attacker could provide a URL like http://evil.com/?q=https://www.example.com/ which would match. The regex should be anchored to the start of the string.
| re := "https?://www\\.example\\.com/" | |
| re := "^https?://www\\.example\\.com/" |
| import "regexp" | ||
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| func broken(hostNames []byte) string { | ||
| var hostRe = regexp.MustCompile("\bforbidden.host.org") |
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The \b in the string literal is interpreted as a backspace character, not a word boundary anchor for the regular expression. To specify a word boundary, you should either use a raw string literal (e.g., \b...) or escape the backslash (e.g., \\b...). Additionally, the dot in forbidden.host.org is unescaped and will match any character. It should be escaped as \\..
| var hostRe = regexp.MustCompile("\bforbidden.host.org") | |
| var hostRe = regexp.MustCompile(`\bforbidden\.host\.org`) |
| func generatePassword() string { | ||
| s := make([]rune, 20) | ||
| for i := range s { | ||
| s[i] = charset[rand.Intn(len(charset))] |
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The math/rand package is not cryptographically secure and should not be used for generating passwords or other security-sensitive values. Use crypto/rand instead. Additionally, the global random number generator in math/rand is not seeded, so it will produce the same sequence of numbers every time the program runs.
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| const ( | ||
| user = "dbuser" | ||
| password = "s3cretp4ssword" |
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Hardcoding credentials is a significant security risk. This password should be loaded from a secure source, such as environment variables or a secret management system, rather than being a constant in the code.
| func handler(db *sql.DB, req *http.Request) { | ||
| q := fmt.Sprintf("SELECT ITEM,PRICE FROM PRODUCT WHERE ITEM_CATEGORY='%s' ORDER BY PRICE", | ||
| req.URL.Query()["category"]) | ||
| db.Query(q) |
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The error and result from db.Query(q) are ignored. This can hide important issues, such as SQL syntax errors or connection problems. You should always handle errors from database operations and ensure sql.Rows are closed to prevent connection leaks.
rows, err := db.Query(q)
if err != nil {
// Handle error
return
}
defer rows.Close()| ) | ||
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| func handler(w http.ResponseWriter, r *http.Request) { | ||
| path := r.URL.Query()["path"][0] |
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Accessing r.URL.Query()["path"][0] directly will cause a panic if the path query parameter is not present. It's safer to use r.URL.Query().Get("path"), which returns an empty string if the parameter is missing.
| path := r.URL.Query()["path"][0] | |
| path := r.URL.Query().Get("path") |
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