{"id":4199,"date":"2014-05-20T22:36:03","date_gmt":"2014-05-20T13:36:03","guid":{"rendered":"http:\/\/www.vincentina.net\/?p=4199"},"modified":"2014-05-20T22:36:03","modified_gmt":"2014-05-20T13:36:03","slug":"%e5%8d%b1%e9%99%ba%e3%81%af%e3%81%99%e3%81%90%e3%81%9d%e3%81%b0%e3%81%ab","status":"publish","type":"post","link":"https:\/\/www.vincentina.net\/?p=4199","title":{"rendered":"\u5371\u967a\u306f\u3059\u3050\u305d\u3070\u306b"},"content":{"rendered":"

\u30dc\u30f3\u30c2\u30fc\u30a2\u3001\u305f\u3051\u3051\u3093\u3067\u3059\u3002<\/p>\n

\u3082\u3068\u3082\u3068\u8106\u5f31\u6027\u3084\u305d\u306e\u5bfe\u7b56\u3068\u304b\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306b\u3064\u3044\u3066\u306f\u8208\u5473\u304c\u3042\u308a\u307e\u3057\u305f\u304c\u3001\u524d\u56de\u306eKernel\u3044\u3058\u3044\u3058\u3092\u3057\u3066\u307f\u3066\u30b5\u30f3\u30d7\u30eb\u304c\u3042\u308c\u3070\u4ee5\u5916\u3068\u7c21\u5358\u306a\u3093\u3060\u3068\u3044\u3046\u4e8b\u3082\u5206\u304b\u3063\u305f\u306e\u3067\u3001\u3044\u308d\u3044\u308d\u8abf\u67fb\u3092\u7d9a\u3051\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n

\u305d\u3093\u306a\u4e2d\u3067\u3001\u590f\u306f\u307e\u3060\u9060\u3044\u3067\u3059\u304c\u3001\u304b\u306a\u308a\u30d2\u30e4\u3063\u3068\u3057\u305f\u4f53\u9a13\u3092\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u30b5\u30fc\u30d0\u30fc\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3084\u30e6\u30fc\u30b6\u30fc\u306e\u6a29\u9650\u3092\u6271\u3046\u3088\u3046\u306a\u5f79\u5272\u3092\u3057\u3066\u3044\u308b\u4eba\u306f\u8981\u30c1\u30a7\u30c3\u30af\u306a\u8a71\u3067\u3059\u304c\u30012002\u5e74\u306e\u8a71\u3060\u3057\u3001\u305d\u3093\u306a\u30dd\u30b8\u30b7\u30e7\u30f3\u306e\u4eba\u306f\u5f53\u7136\u77e5\u3063\u3066\u308b\u5185\u5bb9\u306a\u306e\u304b\u3082\u3057\u308c\u306a\u3044\u3002<\/p>\n

\u53c2\u8003\u30b5\u30a4\u30c8<\/p>\n

IPA
\nhttp:\/\/www.ipa.go.jp\/index.html<\/a><\/p>\n

\u4eca\u65e5\u306e\u53c2\u8003\u30b5\u30a4\u30c8\u306fIPA\u3055\u3093\u3067\u3059\u3002<\/p>\n

\u5185\u5bb9\u306fsetuid\u3001create\u95a2\u6570\u306e\u8106\u5f31\u6027<\/span>\u3092\u4f7f\u3063\u305f\u3082\u306e\u3067\u3059\u304c\u3001\u60aa\u7528\u3057\u305f\u5834\u5408\u3001\u3042\u307e\u308a\u306b\u3082\u7c21\u5358\u306b\u5229\u7528\u4e0d\u53ef\u72b6\u614b\u306b\u9665\u308c\u3089\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n

 <\/p>\n

setuid\u306b\u3064\u3044\u3066<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u304c\u5b9f\u884c\u30d5\u30a1\u30a4\u30eb\u3092\u5b9f\u884c\u3059\u308b\u969b\u306b\u305d\u306e\u5b9f\u884c\u30d5\u30a1\u30a4\u30eb\u306e\u6240\u6709\u8005\u3084\u30b0\u30eb\u30fc\u30d7\u306e\u6a29\u9650\u3067\u5b9f\u884c\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u3002byWikipedia<\/p>\n

create\u95a2\u6570\u306b\u3064\u3044\u3066<\/p>\n

int creat(const char *filename, int amode);
\nfilename\u3067\u6307\u5b9a\u3057\u305f\u30d5\u30a1\u30a4\u30eb\u540d\u3067\u65b0\u3057\u3044\u30d5\u30a1\u30a4\u30eb\u3092amode\u3067\u6307\u5b9a\u3057\u305f\u5c5e\u6027\u3067\u4f5c\u6210\u3057\u307e\u3059\u3002
\n\u3059\u3067\u306b\u540c\u3058\u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3057\u3066\u3044\u308c\u3070\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u30920\u306b\u3057\u307e\u3059\u3002<\/p>\n

\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002<\/p>\n

 <\/p>\n

\u3042\u307e\u308a\u306b\u3082\u7c21\u5358\u306b\u3063\u3066\u66f8\u304d\u307e\u3057\u305f\u304c\u3001\u4e0b\u6e96\u5099\u306f\u5fc5\u8981\u3067\u3001\u554f\u984c\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u6240\u6709\u8005\u3092root\u306b\u3059\u308b\u4e8b\u3068\u3001setuid\uff0fsetgid \u30d3\u30c3\u30c8\u3092\u30bb\u30c3\u30c8\u3059\u308b\u4e8b\u304c\u5fc5\u8981\u3067\u3059\u3002
\n\u524d\u56de\u3084\u3063\u305fKernel\u30e2\u30fc\u30c9\u3067\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3055\u305b\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3082\u4e0b\u6e96\u5099\u306f\u5fc5\u8981\u3067\u3057\u305f\u304c\u3001\u3055\u3059\u304c\u306bKernel\u3092\u518d\u69cb\u7bc9\u3059\u308b\u306e\u3068\u6bd4\u3079\u308b\u3068\u3001\u4eca\u56de\u306e\u3082\u306e\u306f\u305a\u3063\u3068\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002<\/p>\n

\u305d\u308c\u306b\u3057\u305f\u3063\u3066\u3001\u8106\u5f31\u6027\u3067\u3042\u308b\u3053\u3068\u306f\u5909\u308f\u308a\u306a\u3044\u3067\u3059\u3057\u3001\u8aa4\u3063\u3066\u3053\u3046\u3044\u3063\u305f\u4e8b\u306e\u7a2e\u3092\u81ea\u5206\u304c\u4f5c\u3063\u3066\u3057\u307e\u308f\u306a\u3044\u3088\u3046\u306b\u6ce8\u610f\u3057\u3088\u3046\u3002<\/p>\n

\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u72b6\u614b\u306f\u3053\u3093\u306a\u611f\u3058\u3067\u3059\u3002
\n\u30c0\u30a4\u30b8\u30a7\u30b9\u30c8\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u30d5\u30a9\u30eb\u30c0\u306broot\u6a29\u9650\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u3042\u308b\u4e8b\u3058\u305f\u3044\u304c\u304a\u304b\u3057\u3044\u3067\u3059\u304c\u3001\u307e\u3042\u305d\u3053\u306f\u304a\u3044\u3068\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n

[takeken@testserver_centos ~]$ pwd\r\n\/home\/takeken\r\n[takeken@testserver_centos ~]$ ls -l setuid\r\n-rwsrwsr-x. 1 root nobody 6574\u00a0 5\u6708 13 15:33 2014 setuid<\/pre>\n
\u4f55\u3092\u3059\u308b\u304b\u3068\u3044\u3046\u3068\u3001\/etc\/passwd\u3092\u6d88\u3057\u307e\u3059\u3002<\/p>\n
\u4eca\u306f\u3042\u308b\u3088\u3002<\/p>\n
[takeken@testserver_centos ~]$ cat \/etc\/passwd\r\nroot:x:0:0:root:\/root:\/bin\/zsh\r\nbin:x:1:1:bin:\/bin:\/sbin\/nologin\r\ndaemon:x:2:2:daemon:\/sbin:\/sbin\/nologin\r\nadm:x:3:4:adm:\/var\/adm:\/sbin\/nologin<\/pre>\n
\u30d7\u30ed\u30b0\u30e9\u30e0\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n
[takeken@testserver_centos ~]$ .\/setuid\r\n[takeken@testserver_centos ~]$<\/pre>\n
\u306f\u3044\u3001\u6d88\u3048\u305f\u3002<\/p>\n
[takeken@testserver_centos ~]$ cat \/etc\/passwd | head\r\n[takeken@testserver_centos ~]$<\/pre>\n
\u30ed\u30b0\u30a4\u30f3\u3067\u304d\u306a\u3044\u3067\u3059\u3002<\/p>\n
\"a\"<\/a><\/p>\n
\u76f8\u5f53\u7126\u308a\u307e\u3057\u305f\u304c(\u7b11)<\/p>\n
\u3061\u3083\u3093\u3068\u3053\u3046\u3044\u3046\u3082\u306e\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n
[takeken@testserver_centos ~]$ cat \/etc\/passwd- | head\r\nroot:x:0:0:root:\/root:\/bin\/zsh\r\nbin:x:1:1:bin:\/bin:\/sbin\/nologin\r\ndaemon:x:2:2:daemon:\/sbin:\/sbin\/nologin<\/pre>\n
\u516c\u958b\u306f2002\u5e74\u3068\u304b\u306a\u308a\u53e4\u3044\u3067\u3059\u304c\u3001\u5b9f\u969b\u306bsetuid\u3068create\u95a2\u6570\u3067\u6d88\u305b\u3066\u3057\u307e\u3046\u3068\u3044\u3046\u4e8b\u5b9f\u306f\u6b8b\u3063\u3066\u307e\u3059\u306e\u3067\u3001\u8981\u6ce8\u610f\u3067\u3059\u306d\u3002
\nIPA\u306b\u3088\u308b\u3068create\u3067\u306f\u306a\u304f\u3066\u3001open\u3092\u4f7f\u304a\u3046\u3068\u3044\u3046\u4e8b\u3067\u3057\u305f\u3002
\nPerl\u3067\u3082open\u95a2\u6570\u306f\u5f15\u65702\u500b\u306e\u3082\u306e\u306f\u8106\u5f31\u306a\u306e\u3067\u30013\u500b\u3067\u8a18\u8ff0\u3059\u308b\u3088\u3046\u306b\u3068\u3042\u308a\u307e\u3057\u305f\u306d\u3002<\/p>\n
\u30d7\u30ed\u30b0\u30e9\u30e0\u306fIPA\u306b\u7f6e\u3044\u3066\u3042\u308b\u306e\u3067\u3001\u8208\u5473\u306e\u3042\u308b\u65b9\u306f\u662f\u975e\u3002<\/p>\n
 <\/p>\n
\u8106\u5f31\u6027\u306f\u3068\u3066\u3082\u8eab\u8fd1\u306b\u6f5c\u3093\u3067\u3044\u308b\u306e\u3067\u3057\u305f\u3002<\/p>\n
 <\/p>\n
        
Tweet<\/a><\/div><\/div>\n
\n","protected":false},"excerpt":{"rendered":"
\u30dc\u30f3\u30c2\u30fc\u30a2\u3001\u305f\u3051\u3051\u3093\u3067\u3059\u3002 \u3082\u3068\u3082\u3068\u8106\u5f31\u6027\u3084\u305d\u306e\u5bfe\u7b56\u3068\u304b\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306b\u3064\u3044\u3066\u306f\u8208\u5473\u304c\u3042\u308a\u307e\u3057\u305f\u304c\u3001\u524d\u56de\u306eKernel\u3044\u3058\u3044\u3058\u3092\u3057\u3066\u307f\u3066\u30b5\u30f3\u30d7\u30eb\u304c\u3042\u308c\u3070\u4ee5\u5916\u3068\u7c21\u5358\u306a\u3093\u3060\u3068\u3044\u3046\u4e8b\u3082\u5206\u304b\u3063\u305f\u306e\u3067\u3001\u3044\u308d\u3044\u308d\u8abf\u67fb\u3092\u7d9a\u3051 … “\u5371\u967a\u306f\u3059\u3050\u305d\u3070\u306b” \u306e<\/span>\u7d9a\u304d\u3092\u8aad\u3080<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[89],"tags":[],"class_list":["post-4199","post","type-post","status-publish","format-standard","hentry","category-security"],"_links":{"self":[{"href":"https:\/\/www.vincentina.net\/index.php?rest_route=\/wp\/v2\/posts\/4199","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vincentina.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vincentina.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4199"}],"version-history":[{"count":0,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=\/wp\/v2\/posts\/4199\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vincentina.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4199"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4199"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4199"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}