Nginx-UI is a web interface to manage Nginx configurations. The Import Certificate feature allows arbitrary write into the system. The feature does not check if the provided user input is a certification/key and allows to write into arbitrary paths in the system. It's possible to leverage the vulnerability into a remote code execution overwriting the config file app.ini. Version 2.0.0.beta.12 fixed the issue.

Affected: Go: github.com/0xJacky/Nginx-UI

### Summary

The Import Certificate feature allows arbitrary write into the system. The feature does not check if the provided user input is a certification/key and allows to write into arbitrary paths in the system.

https://github.com/0xJacky/nginx-ui/blob/f20d97a9fdc2a83809498b35b6abc0239ec7fdda/api/certificate/certificate.go#L72

```go func AddCert(c *gin.Context) { var json struct { Name string `json:"name"` SSLCertificatePath string `json:"ssl_certificate_path" binding:"required"` SSLCertificateKeyPath string `json:"ssl_certificate_key_path" binding:"required"` SSLCertificate string `json:"ssl_certificate"` SSLCertificateKey string `json:"ssl_certificate_key"` ChallengeMethod string `json:"challenge_method"` DnsCredentialID int `json:"dns_credential_id"` } if !api.BindAndValid(c, &json) { return } certModel := &model.Cert{ Name: json.Name, SSLCertificatePath: json.SSLCertificatePath, SSLCertificateKeyPath: json.SSLCertificateKeyPath, ChallengeMethod: json.ChallengeMethod, DnsCredentialID: json.DnsCredentialID, }

err := certModel.Insert()

if err != nil { api.ErrHandler(c, err) return }

content := &cert.Content{ SSLCertificatePath: json.SSLCertificatePath, SSLCertificateKeyPath: json.SSLCertificateKeyPath, SSLCertificate: json.SSLCertificate, SSLCertificateKey: json.SSLCertificateKey, }

err = content.WriteFile()

if err != nil…