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Brute-force vulnerability for local Rudder user passwords using bcrypt hashing

Critical
amousset published GHSA-33x9-52v4-fwpr Jul 11, 2023

Package

rudder-webapp (rudder)

Affected versions

>= 6.1.0, < 6.1.13
>= 6.2.0, < 6.2.7

Patched versions

6.1.13
6.2.7

Description

Impact

There is a vulnerability allowing to brute-force attacks on local user authentication. If you are using the file authentication provider (i.e. not an LDAP/AD/radius server) with bcrypt password storage (introduced by default since 6.1), you should upgrade your Rudder server to one of these versions.

You can find more details on the possible exploitation here: https://www.synopsys.com/blogs/software-security/cve-2020-28052-bouncy-castle/.

Patches

This bug has been fixed in Rudder 6.1.13 and 6.2.7 which were released on 2021/05/18.

Workarounds

Disable local accounts until upgrade.

References

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L

CVE ID

CVE-2020-28052

Weaknesses