{"id":341,"date":"2023-01-16T14:51:34","date_gmt":"2023-01-16T06:51:34","guid":{"rendered":"https:\/\/shangwendada.co\/?p=341"},"modified":"2023-01-16T14:54:17","modified_gmt":"2023-01-16T06:54:17","slug":"swpuctf-2021-%e6%96%b0%e7%94%9f%e8%b5%9beasy_md5","status":"publish","type":"post","link":"https:\/\/blog.shangwendada.top\/index.php\/2023\/01\/16\/swpuctf-2021-%e6%96%b0%e7%94%9f%e8%b5%9beasy_md5\/","title":{"rendered":"[SWPUCTF 2021 \u65b0\u751f\u8d5b]easy_md5"},"content":{"rendered":"

md5\u7ed5\u8fc7<\/h1>\n

\u5f31\u7c7b\u578b\u6bd4\u8f83<\/h2>\n

\u7531\u4e8ephp\u4e2d\u5b58\u5728==\u7684\u5f31\u7c7b\u578b\u6bd4\u8f83\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7hash\u6bd4\u8f83\u7684\u7f3a\u9677\u53bb\u7ed5\u8fc7
\n\u6bd4\u5982\uff1a<\/p>\n

var_dump("0e12345"=="0e66666");\/\/true\nvar_dump(md5('240610708')==md5('QNKCDZ0'));\/\/true<\/code><\/pre>\n
\u4e5f\u5c31\u662f\u53ea\u8981\u4e24\u4e2a\u6570\u7684md5\u52a0\u5bc6\u540e\u7684\u503c\u4ee50e\u5f00\u5934\u5c31\u53ef\u4ee5\u7ed5\u8fc7\uff0c\u56e0\u4e3aphp\u5728\u8fdb\u884c\u5f31\u7c7b\u578b\u6bd4\u8f83\uff08\u5373==)\u65f6,\u4f1a\u73b0\u8f6c\u6362\u5b57\u7b26\u4e32\u7684\u7c7b\u578b\uff0c\u5728\u8fdb\u884c\u6bd4\u8f83\uff0c\u800c\u5728\u6bd4\u8f83\u662f\u56e0\u4e3a\u4e24\u4e2a\u6570\u90fd\u662f\u4ee50e\u5f00\u5934\u4f1a\u88ab\u8ba4\u4e3a\u662f\u79d1\u5b66\u8ba1\u6570\u6cd5\uff0c0e\u540e\u9762\u52a0\u4efb\u4f55\u6570\u5728\u79d1\u5b66\u8ba1\u6570\u6cd5\u4e2d\u90fd\u662f0\uff0c\u6240\u4ee5\u4e24\u6570\u76f8\u7b49\uff0c\u5728\u8fdb\u884c\u4e25\u683c\u6bd4\u8f83\uff08===\uff09\u65f6\u624d\u4f1a\u5148\u5224\u65ad\u5b57\u7b26\u4e32\u7c7b\u578b\u662f\u5426\u76f8\u7b49\uff0c\u5728\u6bd4\u8f83\u3002
\n\u50cf\u8fd9\u6837\u7279\u6b8a\u7684md5\u503c\u8fd8\u6709<\/p>\n
240610708:0e462097431906509019562988736854\nQLTHNDT:0e405967825401955372549139051580\nQNKCDZO:0e830400451993494058024219903391\nPJNPDWY:0e291529052894702774557631701704\nNWWKITQ:0e763082070976038347657360817689\nNOOPCJF:0e818888003657176127862245791911\nMMHUWUV:0e701732711630150438129209816536\nMAUXXQC:0e478478466848439040434801845361<\/code><\/pre>\n
\u9664\u4e86\u8fd9\u4e9b\u8fd8\u6709\u5f88\u591a\u53c2\u8003\uff1ahttps:\/\/github.com\/spaze\/hashes\/blob\/master\/md5.md<\/a><\/p>\n
md5\u5f3a\u7c7b\u578b\u6bd4\u8f83<\/h2>\n
if(md5((string)$_GET['a'])===md5((string)$_GET['b']))\n{\n    var_dump($flag);\n}<\/code><\/pre>\n
\u6b64\u65f6\u4e24\u4e2amd5\u540e\u7684\u503c\u91c7\u7528\u4e25\u683c\u6bd4\u8f83\uff0c\u6ca1\u6709\u89c4\u5b9a\u5b57\u7b26\u4e32\u5982\u679c\u8fd9\u4e2a\u65f6\u5019\u4f20\u5165\u7684\u662f\u6570\u7ec4\u4e0d\u662f\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u5229\u7528md5()\u51fd\u6570\u7684\u7f3a\u9677\u8fdb\u884c\u7ed5\u8fc7<\/p>\n
var_dump(md5([1,2,3])==md5([4,5,6]));\/\/true\n\nvar_dump(md5($_GET['a'])==md5($_GET['b']));\n?a[]=1&b[]=1\/\/true<\/code><\/pre>\n
md5()\u51fd\u6570\u7684\u63cf\u8ff0\u662fstring md5(string $str[,bool $raw_output=false])<\/p>\n
md5\u4e2d\u9700\u8981\u7684\u662f\u4e00\u4e2astring\u53c2\u6570\uff0c\u4f46\u662f\u5f53\u4f60\u4f20\u5165\u4e00\u4e2aarray(\u6570\u7ec4)\u662f\uff0cmd5()\u662f\u4e0d\u4f1a\u62a5\u9519\u7684\uff0c\u53ea\u662f\u65e0\u6cd5\u6c42\u51faarray\u7684md5\u7684\u503c\uff0c\u8fd9\u6837\u5c31\u4f1a\u5bfc\u81f4\u4efb\u610f\u76842\u4e2aarray\u7684md5\u7684\u503c\u90fd\u4f1a\u76f8\u7b49<\/p>\n
\u5f15\u7528\u81ea\uff1ahttps:\/\/www.codenong.com\/cs109123653\/<\/a><\/p>\n
\u9898\u89e3<\/h1>\n
\"file\"<\/div>
\n\u53ef\u4ee5\u770b\u5230\u8fd9\u91cc\u9700\u8981\u8ba9password != name \u53c8\u9700\u8981\u8ba9\u4ed6\u4eec\u7684md5\u503c\u76f8\u7b49\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981md5\u7ed5\u8fc7<\/p>\n
\u6211\u4eec\u4f7f\u7528hackbar\u4f20\u5165\u53c2\u6570
\n
\"file\"<\/div>
\n\u7136\u540e\u5c31\u80fd\u5f97\u5230flag\u4e86
\n\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528[]\u7c7b\u578b\u6bd4\u8f83\u7684\u65b9\u6cd5,
\n\u7531\u4e8emd5()\u51fd\u6570\u5b58\u5728\u7f3a\u9677,\u52a0\u5bc6[]\u7684\u65f6\u5019\u8fd4\u56de\u503c\u662fNULL\u8fd9\u6837\u5b50\u7684\u8bdd\u5c31\u80fd\u591f\u6210\u529f\u7684\u7ed5\u8fc7
\n
\"file\"<\/div><\/p>\n","protected":false},"excerpt":{"rendered":"
md5\u7ed5\u8fc7 \u5f31\u7c7b\u578b\u6bd4\u8f83 \u7531\u4e8ephp\u4e2d\u5b58\u5728==\u7684\u5f31\u7c7b\u578b\u6bd4\u8f83\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7hash\u6bd4\u8f83\u7684\u7f3a\u9677\u53bb\u7ed5\u8fc7 \u6bd4\u5982\uff1a v […]<\/p>\n","protected":false},"author":1,"featured_media":157,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":["post-341","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-web"],"_links":{"self":[{"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/posts\/341","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/comments?post=341"}],"version-history":[{"count":2,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/posts\/341\/revisions"}],"predecessor-version":[{"id":347,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/posts\/341\/revisions\/347"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/media\/157"}],"wp:attachment":[{"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/media?parent=341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/categories?post=341"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/tags?post=341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}