CVE-2021-43557
CVSS V2 Medium 5
CVSS V3 High 7.5
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.
Overview
- CVE ID
- CVE-2021-43557
- Assigner
- security@apache.org
- Vulnerability Status
- Analyzed
- Published Version
- 2021-11-22T09:15:07
- Last Modified Date
- 2021-11-26T15:47:02
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:* | 1 | OR | 2.10.2 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:L/Au:N/C:P/I:N/A:N
- Access Vector
- NETWORK
- Access Compatibility
- LOW
- Authentication
- NONE
- Confidentiality Impact
- PARTIAL
- Integrity Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 5
- Severity
- MEDIUM
- Exploitability Score
- 10
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- NONE
- Base Score
- 7.5
- Base Severity
- HIGH
- Exploitability Score
- 3.9
- Impact Score
- 3.6
References
| Reference URL | Reference Tags |
|---|---|
| https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h | Exploit Mailing List Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2021/11/22/2 | Mailing List Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2021/11/22/1 | Mailing List Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2021/11/23/1 | Exploit Mailing List Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-43557 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43557 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 06:44:56 | Added to TrackCVE | |||
| 2022-12-05 14:59:25 | 2021-11-22T09:15Z | 2021-11-22T09:15:07 | CVE Published Date | updated |
| 2022-12-05 14:59:25 | 2021-11-26T15:47:02 | CVE Modified Date | updated | |
| 2022-12-05 14:59:25 | Analyzed | Vulnerability Status | updated |