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Date: Tue, 23 Nov 2021 11:29:57 +0800
From: Zhiyuan Ju <>
Cc:, Apache Security Team <>,, Marcin Niemiec <>
Subject: Re: CVE-2021-43557: Apache APISIX: Path traversal in request_uri variable


Thanks to Marcin, and Apache APISIX's Website just published his blog about
this CVE[1].

 Welcome to read this post :)


Best Regards!
@ Zhiyuan Ju <>

Zexuan Luo <> 于2021年11月22日周一 下午2:30写道:

> Severity: moderate
> Description:
> The uri-block plugin in APISIX 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
> "^/internal/", a URI like `//internal/` can be used to bypass it.
> Some other plugins also have the same issue. And it may affect the
> developer's custom plugin.
> This issue is fixed in APISIX 2.10.2.
> Thanks to Marcin Niemiec for reporting the vulnerability.
> Mitigation:
> 1. Upgrade to APISIX 2.10.2
> 2. Carefully review custom code, find & fix the usage of $request_uri
> without verification.

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