CVE-2021-43557
Apache APISIX Uri-Block Bypass Directory Traversal
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.
INFO
Published Date :
Nov. 22, 2021, 9:15 a.m.
Last Modified :
Nov. 26, 2021, 3:47 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2021-43557 has a 2 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-43557.
| URL | Resource |
|---|---|
| http://www.openwall.com/lists/oss-security/2021/11/22/1 | Mailing List Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2021/11/22/2 | Mailing List Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2021/11/23/1 | Exploit Mailing List Third Party Advisory |
| https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h | Exploit Mailing List Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
PoC for CVE-2021-43557
Shell Dockerfile Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-43557 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-43557 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Nov. 26, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Changed Reference Type http://www.openwall.com/lists/oss-security/2021/11/22/1 No Types Assigned http://www.openwall.com/lists/oss-security/2021/11/22/1 Mailing List, Third Party Advisory Changed Reference Type http://www.openwall.com/lists/oss-security/2021/11/22/2 No Types Assigned http://www.openwall.com/lists/oss-security/2021/11/22/2 Mailing List, Third Party Advisory Changed Reference Type http://www.openwall.com/lists/oss-security/2021/11/23/1 No Types Assigned http://www.openwall.com/lists/oss-security/2021/11/23/1 Exploit, Mailing List, Third Party Advisory Changed Reference Type https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h No Types Assigned https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h Exploit, Mailing List, Vendor Advisory Added CWE NIST CWE-77 Added CPE Configuration OR *cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:* versions up to (excluding) 2.10.2 -
CVE Modified by [email protected]
Nov. 23, 2021
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2021/11/23/1 [No Types Assigned] -
CVE Modified by [email protected]
Nov. 22, 2021
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2021/11/22/2 [No Types Assigned] Added Reference http://www.openwall.com/lists/oss-security/2021/11/22/1 [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-43557 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-43557
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.28 }} 0.03%
score
0.68653
percentile