CVE Vulnerability

CVE-2021-43557

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.

5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Scope

7.5 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h Exploit Mailing List
http://www.openwall.com/lists/oss-security/2021/11/22/2 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/11/22/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/11/23/1 Exploit Mailing List
Configurations

Configuration 1

cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:*
Information

Published : 2021-11-22 09:15

Updated : 2021-11-26 03:47

NVD link : CVE-2021-43557

Mitre link : CVE-2021-43557

Products Affected
No products.
CWE
CWE-77