Bug 1673415 (CVE-2019-3814)
| Summary: | CVE-2019-3814 dovecot: Improper certificate validation | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Dhananjay Arunesh <darunesh> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | mhlavink |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | dovecot 2.2.36.1, dovecot 2.3.4.1 | Doc Type: | If docs needed, set a value |
| Doc Text: |
It was discovered that Dovecot incorrectly handled client certificates. A remote attacker in possession of a valid certificate with an empty username field could possibly use this issue to impersonate other users.
|
Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2019-11-06 00:52:09 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1673416, 1674369, 1674370 | ||
| Bug Blocks: | 1673418 | ||
|
Description
Dhananjay Arunesh
2019-02-07 13:23:30 UTC
Created dovecot tracking bugs for this issue: Affects: fedora-all [bug 1673416] External References: https://www.dovecot.org/list/dovecot/2019-February/114575.html This basically affects installation which enable client-side certs. When authenticating with a cert which has empty "user" field, vulnerable versions take the loginame from the user. If no additional password is configured this will allow the user to impersonate anyone else in the system. Mitigation: Attack can be migitated by having the certificates with proper Extended Key Usage, such as 'TLS Web Server' and 'TLS Web Server Client'. Also client-side certification authentication can be turned off using: auth_ssl_require_client_cert = no auth_ssl_username_from_cert = no This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2019:3467 https://access.redhat.com/errata/RHSA-2019:3467 This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2019-3814 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:1062 https://access.redhat.com/errata/RHSA-2020:1062 |