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68 lines
1.7 KiB
Markdown
68 lines
1.7 KiB
Markdown
# 6.1.11 pwn 9447CTF2015 Search-Engine
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- [题目复现](#题目复现)
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- [题目解析](#题目解析)
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- [参考资料](#参考资料)
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[下载文件](../src/writeup/6.1.11_9447ctf2015_search_engine)
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## 题目复现
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```
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$ file search
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search: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.24, BuildID[sha1]=4f5b70085d957097e91f940f98c0d4cc6fb3343f, stripped
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$ checksec -f search
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RELRO STACK CANARY NX PIE RPATH RUNPATH FORTIFY Fortified Fortifiable FILE
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Partial RELRO Canary found NX enabled No PIE No RPATH No RUNPATH Yes 1 3 search
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```
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64 位程序，开启了 NX 和 Canary。
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玩一下，看名字就知道是一个搜索引擎，大概流程是这样的，首先给词库加入一些句子，句子里的单词以空格间隔开，然后可以搜索所有包含某单词的句子，当找到某条句子后，将其打印出来，并询问是否删除。
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```
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$ ./search
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1: Search with a word
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2: Index a sentence
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3: Quit
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2
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Enter the sentence size:
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10
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Enter the sentence:
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hello aaaa
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Added sentence
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1: Search with a word
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2: Index a sentence
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3: Quit
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2
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Enter the sentence size:
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10
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Enter the sentence:
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hello bbbb
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Added sentence
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1: Search with a word
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2: Index a sentence
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3: Quit
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1
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Enter the word size:
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5
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Enter the word:
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hello
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Found 10: hello bbbb
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Delete this sentence (y/n)?
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y
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Deleted!
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Found 10: hello aaaa
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Delete this sentence (y/n)?
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n
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1: Search with a word
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2: Index a sentence
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3: Quit
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3
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```
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根据经验，这是一道堆利用的题目。
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## 题目解析
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## 参考资料
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- [how2heap](https://github.com/shellphish/how2heap)
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