Path traversal in request_uri variable
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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2021-43557US | high7.5 | Exploit | ||
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 p… | ||||
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references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2021/11/22/1ADVISORY
- http://www.openwall.com/lists/oss-security/2021/11/22/2ADVISORY
- http://www.openwall.com/lists/oss-security/2021/11/23/1ADVISORY
- https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7hADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2021-43557WEB
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