CVE-2021-43557 Information

Description

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 ^/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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h http://www.openwall.com/lists/oss-security/2021/11/22/2 http://www.openwall.com/lists/oss-security/2021/11/22/1 http://www.openwall.com/lists/oss-security/2021/11/23/1

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

7.5