CVE-2021-36213
HashiCorp Consul L4 Traffic Failing Open Vulnerability
Description
HashiCorp Consul and Consul Enterprise 1.9.0 through 1.10.0 default deny policy with a single L7 application-aware intention deny action cancels out, causing the intention to incorrectly fail open, allowing L4 traffic. Fixed in 1.9.8 and 1.10.1.
INFO
Published Date :
July 17, 2021, 6:15 p.m.
Last Modified :
Nov. 21, 2024, 6:13 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Upgrade to Consul version 1.9.8 or 1.10.1, or later.
- Review and verify L7 application-aware intention deny actions.
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-2021-36213.
| URL | Resource |
|---|---|
| https://discuss.hashicorp.com/t/hcsec-2021-16-consul-s-application-aware-intentions-deny-action-fails-open-when-combined-with-default-deny-policy/26855 | Vendor Advisory |
| https://github.com/hashicorp/consul/releases/tag/v1.10.1 | Release Notes Third Party Advisory |
| https://security.gentoo.org/glsa/202208-09 | Third Party Advisory |
| https://www.hashicorp.com/blog/category/consul | Product Vendor Advisory |
| https://discuss.hashicorp.com/t/hcsec-2021-16-consul-s-application-aware-intentions-deny-action-fails-open-when-combined-with-default-deny-policy/26855 | Vendor Advisory |
| https://github.com/hashicorp/consul/releases/tag/v1.10.1 | Release Notes Third Party Advisory |
| https://security.gentoo.org/glsa/202208-09 | Third Party Advisory |
| https://www.hashicorp.com/blog/category/consul | Product Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-36213 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-2021-36213
weaknesses.
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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-36213 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-36213 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 af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://discuss.hashicorp.com/t/hcsec-2021-16-consul-s-application-aware-intentions-deny-action-fails-open-when-combined-with-default-deny-policy/26855 Added Reference https://github.com/hashicorp/consul/releases/tag/v1.10.1 Added Reference https://security.gentoo.org/glsa/202208-09 Added Reference https://www.hashicorp.com/blog/category/consul -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Sep. 14, 2022
Action Type Old Value New Value Changed Reference Type https://security.gentoo.org/glsa/202208-09 No Types Assigned https://security.gentoo.org/glsa/202208-09 Third Party Advisory -
CVE Modified by [email protected]
Aug. 10, 2022
Action Type Old Value New Value Added Reference https://security.gentoo.org/glsa/202208-09 [No Types Assigned] -
Initial Analysis by [email protected]
Jul. 29, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Changed Reference Type https://discuss.hashicorp.com/t/hcsec-2021-16-consul-s-application-aware-intentions-deny-action-fails-open-when-combined-with-default-deny-policy/26855 No Types Assigned https://discuss.hashicorp.com/t/hcsec-2021-16-consul-s-application-aware-intentions-deny-action-fails-open-when-combined-with-default-deny-policy/26855 Vendor Advisory Changed Reference Type https://github.com/hashicorp/consul/releases/tag/v1.10.1 No Types Assigned https://github.com/hashicorp/consul/releases/tag/v1.10.1 Release Notes, Third Party Advisory Changed Reference Type https://www.hashicorp.com/blog/category/consul No Types Assigned https://www.hashicorp.com/blog/category/consul Product, Vendor Advisory Added CWE NIST NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:a:hashicorp:consul:*:*:*:*:-:*:*:* versions from (including) 1.9.0 up to (excluding) 1.9.8 *cpe:2.3:a:hashicorp:consul:*:*:*:*:enterprise:*:*:* versions from (including) 1.9.0 up to (excluding) 1.9.8 *cpe:2.3:a:hashicorp:consul:*:*:*:*:-:*:*:* versions from (including) 1.10.0 up to (excluding) 1.10.1 *cpe:2.3:a:hashicorp:consul:*:*:*:*:enterprise:*:*:* versions from (including) 1.10.0 up to (excluding) 1.10.1 -
CVE Modified by [email protected]
Jul. 19, 2021
Action Type Old Value New Value Changed Description In HashiCorp Consul before 1.10.1 (and Consul Enterprise), xds can generate a situation where a single L7 deny intention (with a default deny policy) results in an allow action. HashiCorp Consul and Consul Enterprise 1.9.0 through 1.10.0 default deny policy with a single L7 application-aware intention deny action cancels out, causing the intention to incorrectly fail open, allowing L4 traffic. Fixed in 1.9.8 and 1.10.1. Added Reference https://discuss.hashicorp.com/t/hcsec-2021-16-consul-s-application-aware-intentions-deny-action-fails-open-when-combined-with-default-deny-policy/26855 [No Types Assigned]
Vulnerability Scoring Details
Base CVSS Score: 7.5
Base CVSS Score: 5
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
1.06 }} -0.07%
score
0.76710
percentile