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      <title>CVE-2021-43557 — Path traversal in request_uri variable</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2021-43557</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache APISIX&lt;/p&gt;
&lt;p&gt;The uri-block plugin in Apache APISIX before 2.10.2 uses $request_uri without verification. The $request_uri is the full original request URI without normalization. This makes it possible to construct a URI to bypass the block list on some occasions. For instance, when the block list contains &amp;#34;^/internal/&amp;#34;, a URI like `//internal/` can be used to bypass it. Some other plugins also have the same issue. And it may affect the developer&amp;#39;s custom plugin.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache APISIX&lt;/p&gt;
&lt;p&gt;The uri-block plugin in Apache APISIX before 2.10.2 uses $request_uri without verification. The $request_uri is the full original request URI without normalization. This makes it possible to construct a URI to bypass the block list on some occasions. For instance, when the block list contains &amp;#34;^/internal/&amp;#34;, a URI like `//internal/` can be used to bypass it. Some other plugins also have the same issue. And it may affect the developer&amp;#39;s custom plugin.&lt;/p&gt;</content:encoded>
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