CVE-2020-14325
Description
A vulnerability was found in Red Hat CloudForms which allows a malicious attacker to impersonate any user or create a non-existent user with any entitlement in the appliance and perform an API request.
Statement
The vulnerability and related criticality depends on the product releases and protocols. In CloudForms 5.11, attacker need to be authenticated through OIDC but SAML do not need any authentication for exploitation. However, for CloudForms 5.10, both SAML and OIDC protocols does not need authentication and attacker can impersonate users previously logged in.
Red Hat does not support CloudForms 5.9 and earlier releases, however, confirms vulnerability affects SAML protocol but not OIDC. Reference metrics: https://bugzilla.redhat.com/show_bug.cgi?id=1855739#c3
Mitigation
Red Hat recommends upgrading to secured released versions, however, this flaw can be mitigated by unseting RequestHeader in http configuration. Mitigation steps would be:
1. Stop httpd service
$ systemctl stop httpd
2. Add following additional unset at `/etc/httpd/conf.d/manageiq-remote-user-openidc.conf` and `/etc/httpd/conf.d/manageiq-remote-user.conf`, right before `X_REMOTE_USER` unset.
RequestHeader unset X-REMOTE-USER
RequestHeader unset X-REMOTE_USER
RequestHeader unset X_REMOTE-USER
3. Validate configuration files to make sure all syntax is valid
$ apachectl configtest
4. Restart httpd service
$ systemctl start httpd
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 9.9 | 9.1 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Changed | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | Low | High | N/A |
| Availability Impact | Low | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data; Read Files or Directories
An attacker could read sensitive data, either by reading the data directly from a data store that is not properly restricted, or by accessing insufficiently-protected, privileged functionality to read the data.
Integrity
Technical Impact: Modify Application Data; Modify Files or Directories
An attacker could modify sensitive data, either by writing the data directly to a data store that is not properly restricted, or by accessing insufficiently-protected, privileged functionality to write the data.
Access Control
Technical Impact: Gain Privileges or Assume Identity; Execute Unauthorized Code or Commands
When access control checks are not applied consistently - or not at all - an attacker could gain privileges and execute unauthorized code or commands by modifying or reading critical data directly, or by accessing insufficiently-protected, privileged functionality.
Acknowledgements
This issue was discovered by Alberto Bellotti (Red Hat).
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