oss-sec mailing list archives
Re: CVE-2021-43557: Apache APISIX: Path traversal in request_uri variable
From: Zhiyuan Ju <juzhiyuan () apache org>
Date: Tue, 23 Nov 2021 11:29:57 +0800
Hi, Thanks to Marcin, and Apache APISIX's Website just published his blog about this CVE[1]. Welcome to read this post :) [1] https://apisix.apache.org/blog/2021/11/23/cve-2021-43557-research-report Best Regards! @ Zhiyuan Ju <https://github.com/juzhiyuan> Zexuan Luo <spacewander () apache org> 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.
Current thread:
- CVE-2021-43557: Apache APISIX: Path traversal in request_uri variable Zexuan Luo (Nov 22)
- Re: CVE-2021-43557: Apache APISIX: Path traversal in request_uri variable Marcin Niemiec (Nov 22)
- Re: CVE-2021-43557: Apache APISIX: Path traversal in request_uri variable Zhiyuan Ju (Nov 23)