Date: Tue, 23 Nov 2021 11:29:57 +0800 From: Zhiyuan Ju <juzhiyuan@...che.org> To: dev@...six.apache.org Cc: announce@...che.org, Apache Security Team <security@...che.org>, oss-security@...ts.openwall.com, Marcin Niemiec <niemiec.marcin@...il.com> Subject: Re: CVE-2021-43557: Apache APISIX: Path traversal in request_uri variable Hi, Thanks to Marcin, and Apache APISIX's Website just published his blog about this CVE. Welcome to read this post :)  https://apisix.apache.org/blog/2021/11/23/cve-2021-43557-research-report Best Regards! @ Zhiyuan Ju <https://github.com/juzhiyuan> Zexuan Luo <spacewander@...che.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. >
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