{"id":32327,"date":"2023-01-29T00:01:11","date_gmt":"2023-01-28T18:31:11","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-is-it-possible-to-crack-the-password-in-this-c-program\/"},"modified":"2023-01-29T00:01:11","modified_gmt":"2023-01-28T18:31:11","slug":"solved-is-it-possible-to-crack-the-password-in-this-c-program","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-is-it-possible-to-crack-the-password-in-this-c-program\/","title":{"rendered":"[Solved] Is it possible to crack the password in this c program?"},"content":{"rendered":"

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OP has done a significant edit a 2nd time – better to start a new question. @J.Selva, do not change the question again.<\/p>\n

In this version, the below code does not check the return value of fgets()<\/code> (which is an exploit opening) and yet uses password<\/code>. This creates a problem that may be used to crack. Say a previous run of code with the correct password occurred. Now with this run, the nefarious user causes an IO error which fgets()<\/code> returns NULL<\/code>. The contents of passwd<\/code> are indeterminate and could<\/em> be the value of a previous fgets()<\/code> call. The memset()<\/code> does not help here as that clears passwd<\/code> and not the internal buffers used by fgets()<\/code> to assign password<\/code>.<\/p>\n

memset(passwd,0,sizeof(passwd));\nfgets(password, sizeof password, stdin);\nstrcpy(passwd, password);\n<\/code><\/pre>\n
Proper code would use<\/p>\n
\/\/ memset not needed\n\/\/ memset(passwd,0,sizeof(passwd));\n\nif (fgets(password, sizeof password, stdin) == NULL) {\n  Handle_EOForInputError();\n  return -1;\n}\nstrcpy(passwd, password);\n<\/code><\/pre>\n<\/p><\/div>\n
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solved Is it possible to crack the password in this c program? <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] OP has done a significant edit a 2nd time – better to start a new question. @J.Selva, do not change the question again. In this version, the below code does not check the return value of fgets() (which is an exploit opening) and yet uses password. This creates a problem that may be used … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,1470],"class_list":["post-32327","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-passwords"],"yoast_head":"\n[Solved] Is it possible to crack the password in this c program? - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-is-it-possible-to-crack-the-password-in-this-c-program\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Is it possible to crack the password in this c program? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] OP has done a significant edit a 2nd time – better to start a new question. @J.Selva, do not change the question again. 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