Adobe Reader PDF - LibTiff Integer Overflow Code Execution
漏洞编号：CVE-2010-0188
漏洞类型：Integer Overflow
漏洞影响：代码执行
漏洞介绍
Adobe 在解析TIFF 图像文件的时候，使用了开源库代码 (libtiff) 存在堆栈溢出的bug，漏洞出在对DotRange属性的解析上。
实验环境
Windows XP SP3
Adobe Reader 9.0
漏洞分析
前置知识：Tiff文件格式
TIFF是一种存储图像的文件格式，TIFF文件主要由图像文件头IFH和图像文件目录IFD组成
图像文件头：
- Byte order：可能是0x4d4d（Motoral整数格式）或0x4949（Intel整数格式）
- Version：固定值：0x2a
- Offset to first IFD：第一个IFD相对文件开始的偏移量
图像文件目录：
一个TIF图可能有多个IFD，这说明文件中有多个图像，每个IFD标识1个图像的基本属性。
IFD结构中包含了三类成员：
-
Directory Entry Count指出该结构里面有多少个目录入口；
-
接下来就是N个线性排列的DE序列，数量不定，每个DE标识了图像的某一个属性；
- 这就是为什么称TIF格式文件为可扩充标记的文件，甚至用户可以添加自定义的标记属性
目录项DE：
- tag成员是该属性的编号
- 属性是用数据来表示的，type就是代表着该数据的类型。
- length成员是数据的数量而不是数据类型的长度。
- valueOffset很重要，它是tag标识属性的值相对文件的偏移量。如果变量值占用的空间小于4个字节，那么该值就存放在 valueOffset中。
这里的漏洞正式因为程序没有对DotRange属性的值进行合法性验证，DotRange属性（336）有两个值分别是DotRange[0]，DotRange[1]，当length小于2时，这里的ValueOffset直接存的就是值，大于等于2这种情况没有得到妥善的处理，就像其他属性一样把该值当成了偏移量，在把该属性的值从tiff格式中取出时发生栈溢出，从而造成漏洞
poc文件分析
poc来自参考资料[1]：里面最主要的一段就是这个嵌入的tiff文件了，是base64编码过的：
<ImageField1 xfa:contentType="image/tif" 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解码后的结果：最底下的DotRange属性记录的偏移对应的是文件最后开始的这段内容
调试-定位溢出点
因为shellcode的功能是打开calc.exe，使用的是WinExec，所以直接在WinExec下断点，断下来后查看堆栈：
发生调用的位置在acroform模块里，很可能这个漏洞就发生在这个最近的调用函数里
通过一层又一层的跟进，找到每一个会不正常跳转的call，在最后一个会不正常跳转的call里，发现了造成溢出的元凶：程序会将Tiff图像中的每个DE属性都复制走，因为处理不当，接收的地方只预留了4字节的空间，而这里会复制0x130字节的内容，造成溢出
复制的内容正好就是上文中从poc的Tiff文件最后看到的0x2092偏移处的值，这些值不是shellcode，是构造的rop，可以看到，堆栈被成功覆盖
这里的rop用来绕过编译器插入的栈溢出检查，经过一系列跳转最终跳入shellcode里进行执行。
参考资料
- [1] Adobe Reader PDF - LibTiff Integer Overflow Code Execution - Windows local Exploit (exploit-db.com)
- [2] [原创]Adobe PDF LibTiff Integer Overflow CVE-2010-0188初探-二进制漏洞-看雪论坛-安全社区|安全招聘|bbs.pediy.com
- [3] CVE-2010-0188漏洞点定位_好奇的娃娃的博客-CSDN博客
- [4] 腾讯反病毒实验室 (qq.com)
- [5] Adobe PDF LibTiff Integer Overflow CVE-2010-0188分析_p0x1307的博客-CSDN博客
- [6] CVE-2010-0188: PDF/Form/TIFF – Cerbero Blog