GHSA-6xjj-v76v-fwpj CVE-2023-4107
Mattermost does not validate requesting user permissions before updating admin details
Medium
Go
- Severity
- 6.7 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 0.51%
- Chance of exploitation in the next 30 days. Higher than 43.43% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Fix
7.8.8- Upgrade github.com/mattermost/mattermost-server/v6 to this version or later
Description
Mattermost fails to properly validate the requesting user permissions when updating a system admin, allowing a user manager to update a system admin's details such as email, first name and last name.
Affected versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| github.com/mattermost/mattermost-server/v6 | < 7.8.8 |
7.8.8 |
| github.com/mattermost/mattermost-server/v6 | >= 7.9.0, < 7.9.6 |
7.9.6 |
| github.com/mattermost/mattermost-server/v6 | >= 7.10.0, < 7.10.4 |
7.10.4 |
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/mattermost/mattermost-server/v6 Go → 7.8.8
- go
go get github.com/mattermost/mattermost-server/v6@v7.8.8 && go mod tidy
Severity breakdown
CVSS 3.1 6.7
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- Low
Weakness
CWE-284: Improper Access Control
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
How to prevent it
- Architecture and Design, Operation: Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
- Architecture and Design: Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
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
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-xmfh-3ccg-c9fx Mattermost has an Incorrect Authorization issue | Low | Also affects github.com/mattermost/mattermost-server/v6 |
| GHSA-6hxm-w4hv-vgvw Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints | High | Also affects github.com/mattermost/mattermost-server/v6 |
| GHSA-9p44-r552-4wp9 Mattermost doesn't sanitize the Remote Cluster API response on PATCH operations | Medium | Also affects github.com/mattermost/mattermost-server/v6 |
| GHSA-8qq9-cqj8-82w4 Mattermost doesn't sanitize FileInfo.Name received from federated peers during shared channel file sync | High | Also affects github.com/mattermost/mattermost-server/v6 |
| GHSA-m2w9-h2mm-79qr Mattermost doesn't require system-level permission when patching protected default system roles | High | Also affects github.com/mattermost/mattermost-server/v6 |
| GHSA-c28q-m4gf-vg4q Mattermost doesn't enforce PermissionInviteUser when setting AllowOpenInvite or AllowedDomains during team creation | Medium | Also affects github.com/mattermost/mattermost-server/v6 |
| GHSA-3vmp-whvv-5v9v Mattermost doesn't validate that a username returned during bot registration belongs to a bot account | Medium | Also affects github.com/mattermost/mattermost-server/v6 |
| GHSA-rp4v-qc77-phm4 Mattermost doesn't restrict role_updated websocket event broadcasts to members of the affected team or channel | Medium | Also affects github.com/mattermost/mattermost-server/v6 |
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