Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Apisix | < 2.10.2 |
Related Weaknesses (CWE)
References
- http://www.openwall.com/lists/oss-security/2021/11/22/1Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2021/11/22/2Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2021/11/23/1ExploitMailing ListThird Party Advisory
- https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7hExploitMailing ListVendor Advisory
- http://www.openwall.com/lists/oss-security/2021/11/22/1Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2021/11/22/2Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2021/11/23/1ExploitMailing ListThird Party Advisory
- https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7hExploitMailing ListVendor Advisory
FAQ
What is CVE-2021-43557?
CVE-2021-43557 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2021-43557?
CVE-2021-43557 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-43557?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Apisix.