近来雨后春笋般冒出的琐事逐渐成为了逃避写blog的借口,或者说搜肠刮肚也找不出几行有价值的文字。
上月看的几部作品除了托尼史塔克的”Love you 3000”以外都记不太清了,应该说在情怀面前其他情节都变成了细枝末节。
以后个人blog上的Writeup尽量都用英文写了,看多了各种日文韩文的资料以后,换位思考一下感觉国际化还是有必要的。
This is a challenage from *CTF 2019 last weekend, a great CTF from sixstar team. For this particular challenge, you could found at least 3 avaliable Writeup (except for this one). The official Writeup here, one from shift-crops, and one from the Balsn Team.
I analyzed all three writeups and personally appreciated the one from Japanese player shift-crops the best. So the following paragraphs will focus on his method and try to clarify some glibc heap attack concepts he used.
The official Writeup and shift-crops’ did a great explanation about reversing process, so I’ll spare that part here. The exploit relays heavily on unsorted bin attack
, and here is a brief description of this technique.