GHSA-6m72-467w-94rh BIT-consul-2020-28053 CVE-2020-28053 GO-2024-2505
Privilege Escalation in HashiCorp Consul
Medium
Go
- Severity
- 6.5 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 1.45%
- Chance of exploitation in the next 30 days. Higher than 73.43% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-732 Incorrect Permission Assignment for Critical Resource
- CWE-863 Incorrect Authorization
- Fix
1.6.10- Upgrade github.com/hashicorp/consul to this version or later
Description
HashiCorp Consul and Consul Enterprise 1.2.0 up to 1.8.5 allowed operators with operator:read ACL permissions to read the Connect CA private key configuration. Fixed in 1.6.10, 1.7.10, and 1.8.6.
Affected versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| github.com/hashicorp/consul | >= 1.2.0, < 1.6.10 |
1.6.10 |
| github.com/hashicorp/consul | >= 1.7.0, < 1.7.10 |
1.7.10 |
| github.com/hashicorp/consul | >= 1.8.0, < 1.8.6 |
1.8.6 |
| github.com/hashicorp/consul | >= 1.2.0, < 1.6.10>= 1.7.0, < 1.7.10>= 1.8.0, < 1.8.6 |
1.6.101.7.101.8.6 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
github.com/hashicorp/consul Go → 1.6.10
- go
go get github.com/hashicorp/consul@v1.6.10 && go mod tidy
Severity breakdown
CVSS 3.1 6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Weakness
CWE-732: Incorrect Permission Assignment for Critical Resource
The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.
How to prevent it
- Implementation: When using a critical resource such as a configuration file, check to see if the resource has insecure permissions (such as being modifiable by any regular user) [REF-62], and generate an error or even exit the software if there is a possibility that the resource could have been modified by an unauthorized party.
- Architecture and Design: Divide the software into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully defining distinct user groups, privileges, and/or roles. Map these against data, functionality, and the related resources. Then set the permissions accordingly. This will allow you to maintain more fine-grained control over your resources. [REF-207]
- Architecture and Design, Operation: Run the code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software. OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, java.io.FilePermission in the Java SecurityManager allows the software to specify restrictions on file operations. This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise. Be careful to avoid CWE-243 and other weaknesses related to jails.
- Implementation, Installation: During program startup, explicitly set the default permissions or umask to the most restrictive setting possible. Also set the appropriate permissions during program installation. This will prevent you from inheriting insecure permissions from any user who installs or runs the program.
- System Configuration: For all configuration files, executables, and libraries, make sure that they are only readable and writable by the software's administrator.
- Documentation: Do not suggest insecure configuration changes in documentation, especially if those configurations can extend to resources and other programs that are outside the scope of the application.
- Installation: Do not assume that a system administrator will manually change the configuration to the settings that are recommended in the software's manual.
- Operation, System Configuration: Ensure that the software runs properly under the United States Government Configuration Baseline (USGCB) [REF-199] or an equivalent hardening configuration guide, which many organizations use to limit the attack surface and potential risk of deployed software.
- Implementation, System Configuration, Operation: When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to disable public access.
CWE-863: Incorrect Authorization
The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
How to prevent it
- Architecture and Design: Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) [REF-229] to enforce the roles at the appropriate boundaries. Note that this approach may not protect against horizontal authorization, i.e., it will not protect a user from attacking others with the same role.
- Architecture and Design: Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records. For example, a database may restrict access for medical records to a specific database user, but each record might only be intended to be accessible to the patient and the patient's doctor [REF-7].
- Architecture and Design: Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, consider using authorization frameworks such as the JAAS Authorization Framework [REF-233] and the OWASP ESAPI Access Control feature [REF-45].
- Architecture and Design: For web applications, make sure that the access control mechanism is enforced correctly at the server side on every page. Users should not be able to access any unauthorized functionality or information by simply requesting direct access to that page. One way to do this is to ensure that all pages containing sensitive information are not cached, and that all such pages restrict access to requests that are accompanied by an active and authenticated session token associated with a user who has the required permissions to access that page.
- System Configuration, Installation: Use the access control capabilities of your operating system and server environment and define your access control lists accordingly. Use a "default deny" policy when defining these ACLs.
References
Advisories
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-cpfq-66p2-336j Consul is vulnerable to arbitrary file read when configured with Kubernetes authentication | Medium | Also affects github.com/hashicorp/consul |
| GHSA-qh7p-pfq3-677h Consul event endpoint is vulnerable to denial of service | Medium | Also affects github.com/hashicorp/consul |
| GHSA-7g3r-8c6v-hfmr Consul key/value endpoint is vulnerable to denial of service | Medium | Also affects github.com/hashicorp/consul |
| GHSA-99wr-c2px-grmh Hashicorp Consul Cross-site Scripting vulnerability | Medium | Also affects github.com/hashicorp/consul |
| GHSA-5c4w-8hhh-3c3h Hashicorp Consul Improper Neutralization of HTTP Headers for Scripting Syntax vulnerability | Medium | Also affects github.com/hashicorp/consul |
| GHSA-chgm-7r52-whjj Hashicorp Consul Path Traversal vulnerability | Medium | Also affects github.com/hashicorp/consul |
| GHSA-496g-fr33-whrf Denial of service in HashiCorp Consul | High | Also affects github.com/hashicorp/consul |
| GHSA-9rhf-q362-77mx Consul JWT Auth in L7 Intentions Allow for Mismatched Service Identity and JWT Providers | High | Also affects github.com/hashicorp/consul |
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