Path traversal in request_uri variable (CVE-2021-43557)

Summary

Path traversal in request_uri variable

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

Affected packages

Bitnami apisix

[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.10.2"}]}]

References

advisory openwall.com
advisory openwall.com
advisory openwall.com
advisory lists.apache.org
web nvd.nist.gov