原题
Linked lists are great! They let you chain pieces of data together.
nc pwn.chal.csaw.io 9005
链接:https://ctftime.org/task/6644
附件:(请将文件改名为shellpointcode)
题解
首先看下文件的基本信息:
$ file shellpointcode
shellpointcode: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0, BuildID[sha1]=214cfc4f959e86fe8500f593e60ff2a33b3057ee, not stripped
一个64位Linux二进制动态链接文件且未去除符号信息(not stripped)
再看下二进制文件的安全措施:
$ checksec shellpointcode
Arch: amd64-64-little
RELRO: Full RELRO
Stack: No canary found
NX: NX disabled
PIE: PIE enabled
RWX: Has RWX segments
二进制文件开启了PIE但栈空间未开启canary且可执行