Burp的新版本更新了新的API接口，刚好最近有写插件的想法，所以简单的了解了下。
单从MontoyaApi文档[1]界面来看，结构清晰了不少
同时官方提供了一个demo[2]
与老版本类似，创建一个插件项目需要继承类BurpExtension，它只包含了一个初始化函数
public interface BurpExtension {
void initialize(MontoyaApi var1);
}
同样的，想要调用扫描等功能，也需要进行注册，比如我们注册一个扫描
public void initialize(MontoyaApi montoyaApi) {
this.montoyaApi = montoyaApi;
montoyaApi.scanner().registerScanCheck(new FastjsonCheck());
}
public class FastjsonCheck implements ScanCheck {
@Override
public List<AuditIssue> activeAudit(HttpRequestResponse httpRequestResponse, AuditInsertionPoint auditInsertionPoint) {
return null;
}
@Override
public List<AuditIssue> passiveAudit(HttpRequestResponse httpRequestResponse) {
return null;
}
@Override
public ConsolidationAction consolidateIssues(AuditIssue auditIssue, AuditIssue auditIssue1) {
return null;
}
}
与之前类似，activeAudit主动，passiveAudit被动，consolidateIssues定义重复问题的展示规则。具体扫描逻辑与旧版本就大同小异了，不过新版本调用某些方法变得更加方便了，比如调用collaborator:
CollaboratorClient collaboratorClient = montoyaApi.collaborator().createClient();
//生成域名链接
String payload = collaboratorClient.generatePayload().toString();
//访问域名操作
......
//检查记录
List<Interaction> interactions = collaboratorClient.getAllInteractions();
报告的展示与旧版本基本相同，感觉只是变了名称
import burp.api.montoya.http.HttpService;
import burp.api.montoya.http.message.MarkedHttpRequestResponse;
import burp.api.montoya.scanner.audit.issues.AuditIssue;
import burp.api.montoya.scanner.audit.issues.AuditIssueConfidence;
import burp.api.montoya.scanner.audit.issues.AuditIssueDefinition;
import burp.api.montoya.scanner.audit.issues.AuditIssueSeverity;
import java.util.Arrays;
import java.util.List;
/**
* @program: BurpMontoya
* @description:
* @author: Noel
* @create: 2022-09-21 01:35
**/
public class ExampleAudit implements AuditIssue {
private String name;
private String detail;
private HttpService httpService;
private MarkedHttpRequestResponse[] requestResponses;
private AuditIssueConfidence confidence;
private AuditIssueSeverity severity;
private String baseurl;
public ExampleAudit(String name, String detail, HttpService httpService, MarkedHttpRequestResponse[] requestResponses, AuditIssueSeverity severity, AuditIssueConfidence confidence, String baseurl){
this.name = name;
this.detail = detail;
this.httpService = httpService;
this.requestResponses = requestResponses;
this.severity = severity;
this.confidence = confidence;
this.baseurl = baseurl;
}
@Override
public String name() {
return name;
}
@Override
public String detail() {
return detail;
}
@Override
public String remediation() {
return null;
}
@Override
public HttpService httpService() {
return httpService;
}
@Override
public String baseUrl() {
return baseurl;
}
@Override
public AuditIssueSeverity severity() {
return severity;
}
@Override
public AuditIssueConfidence confidence() {
return confidence;
}
@Override
public List<MarkedHttpRequestResponse> requestResponses() {
return Arrays.asList(requestResponses);
}
@Override
public AuditIssueDefinition definition() {
return null;
}
}
这些结合起来便可以完成一个Burp插件的开发了
前段时间出了Fastjson 1.2.80的利用与检测方式，刚好我们拿来做一个Fastjson检测的插件,payload如下:
[
{
"@type":"java.lang.Exception","@type":"com.alibaba.fastjson.JSONException",
"x":{
"@type":"java.net.InetSocketAddress"{"address":,"val":"80.DNS"} // fastjson < 1.2.83
}
},
{
"@type":"java.lang.Exception","@type":"com.alibaba.fastjson.JSONException",
"message":{
"@type":"java.net.InetSocketAddress"{"address":,"val":"83_.DNS"} // fastjson = 1.2.83
}
}
]
如果 fastjson版本低于1.2.83，DNS只会收到一个80开头的请求，方便我们进行版本判断。我们的检测思路就是遇到json格式的body或者param就全部替换为payload，具体操作如下：
HttpRequest request = httpRequestResponse.httpRequest();
获取参数
List<ParsedHttpParameter> parameters = request.parameters();
json格式//utilities.urlUtils包含了对URL处理的函数，这里使用了decode，对URL进行解码
utilities.urlUtils().decode(p.value()).startsWith("{") ||utilities.urlUtils().decode(p.value()).startsWith("[")
collaboratorClient并发送请求//生成collaborator链接
String payload = collaboratorClient.generatePayload().toString();
// poc
private String Fastjson_Payload = "[\n" +
" {\n" +
" \"@type\":\"java.lang.Exception\",\"@type\":\"com.alibaba.fastjson.JSONException\",\n" +
"\t\t\"x\":{\n" +
"\t\t\t\"@type\":\"java.net.InetSocketAddress\"{\"address\":,\"val\":\"fastjson80.%s\"} \n" +
"\t\t}\n" +
" },\n" +
" {\n" +
" \"@type\":\"java.lang.Exception\",\"@type\":\"com.alibaba.fastjson.JSONException\",\n" +
"\t\t\"message\":{\n" +
"\t\t\t\"@type\":\"java.net.InetSocketAddress\"{\"address\":,\"val\":\"fastjson83.%s\"} \n" +
"\t\t}\n" +
" }\n" +
"]";
//更新参数为我们的poc
HttpRequest rq = request.withUpdatedParameters(HttpParameter.parameter(p.name(),utilities.urlUtils().encode(String.format(Fastjson_Payload, payload, payload)), p.type()));
//发送请求
HttpRequestResponse httpRequestResponse1 = http.issueRequest(rq);
dns中是否包含有fastjson83// 获取Collaborator服务器中所有与payload有关的请求信息
List<Interaction> interactions = collaboratorClient.getInteractions(InteractionFilter.interactionPayloadFilter(payload));
for (Interaction i :interactions) {
// i.dnsDetails()获取一个DnsDetails的Optional对象，DnsDetails有两个方法，一个是获取dns查询的byte数组 d.query()
// 利用byteUtils().indexOf查询是否包含fastjson83
flag = i.dnsDetails().filter(d ->
utilities.byteUtils().indexOf(d.query(), utilities.byteUtils().convertFromString("fastjson83")) > 0
).isPresent();
}
ExampleAudit auditIssue = new ExampleAudit("Example", "Example detail", request.httpService(),new MarkedHttpRequestResponse[]{httpRequestResponse.withNoMarkers(), httpRequestResponse1.withNoMarkers()}, AuditIssueSeverity.HIGH, AuditIssueConfidence.CERTAIN, request.url());
auditIssues.add(auditIssue);
至此一个burp插件算是完成了。
在检测dns记录的时候遇到了一个问题，DNS数据包中.并不是ord('.')的格式
为了准确识别，采用了fastjson83而非fastjson83.payload
目前新接口还在不断更新中，不是特别稳定。比如说文档中的DnsDetails会返回ByteArray类型
但是目前最新的burp接口中还是byte[]
[1] https://portswigger.github.io/burp-extensions-montoya-api/javadoc/burp/api/montoya/MontoyaApi.html
[2] https://github.com/PortSwigger/burp-extender-montoya-api