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class=\"language-cobol\">&lt;img src=&quot;\/loadImage?filename=214.png&quot;&gt;\n<\/code><\/pre>\n<p>\u4f7f\u7528filename\u53c2\u6570\u52a0\u8f7d\u56fe\u50cf\u6587\u4ef6\uff0c\u56fe\u7247\u6587\u4ef6\u4f4d\u7f6e\u53ef\u80fd\u6620\u5c04\u5728 \/var\/www\/images\/ \u4e0a\uff0c\u6240\u4ee5\u771f\u5b9e\u7684\u8def\u5f84\u662f \/var\/www\/images\/214.png\u00a0<br \/>\n\u8fd9\u5c31\u5bfc\u81f4\u4e86\u653b\u51fb\u8005\u53ef\u4ee5\u8bfb\u53d6\u670d\u52a1\u5668\u4e0a\u7684\u4efb\u610f\u6587\u4ef6\uff1a<\/p>\n<pre><code class=\"language-cobol\">https:\/\/www.*****.com\/loadImage?filename=..\/..\/..\/etc\/passwd\n<\/code><\/pre>\n<p>filename\u7684\u53c2\u6570\u503c\u4e0e\u771f\u5b9e\u8def\u5f84\u7ec4\u5408\u8d77\u6765\u5c31\u662f\uff1a<\/p>\n<pre><code class=\"language-cobol\">\/var\/www\/images\/..\/..\/..\/etc\/passwd\n<\/code><\/pre>\n<p>\u5176\u7b49\u4ef7\u4e8e\uff1a<\/p>\n<pre><code class=\"language-cobol\">\/etc\/passwd\n<\/code><\/pre>\n<p>\u5728Unix\u64cd\u4f5c\u7cfb\u7edf\u4e0a\uff0c..\/ \u662f\u4e00\u4e2a\u6807\u51c6\u7684\u8fd4\u56de\u4e0a\u4e00\u7ea7\u8def\u5f84\u7684\u8bed\u6cd5\uff1b<br \/>\n\u5728Windows\u64cd\u4f5c\u7cfb\u7edf\u4e0a\uff0c ..\/ \u548c ..\\ 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