Description
The OpenSSH server, as used in Fedora and Red Hat Enterprise Linux 7 and when running in a Kerberos environment, allows remote authenticated users to log in as another user when they are listed in the .k5users file of that user, which might bypass intended authentication requirements that would force a local login.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | openssh +6 | 6.6.1p1-11.el7 | RHSA-2015:0425 |
| RHEL 7 | pam_ssh_agent_auth | 0.9.3-9.11.el7 | RHSA-2015:0425 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | openssh +6 | 6.6.1p1-11.el7 | ELSA-2015-0425 |
| Oracle Linux 7 | pam_ssh_agent_auth | 0.9.3-9.11.el7 | ELSA-2015-0425 |
Advisories 2
- RHSA-2015:0425 Red Hat Security Advisory: openssh security, bug fix and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- ELSA-2015-0425 Moderate: openssh security, bug fix and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 9, 2015
References
- 71420 vdb-entry
- [oss-security] 20141204 Re: CVE request: OpenSSH ~/.k5users patch (Fedora and downstreams) mailing-list
- RHSA-2015:0425 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1169843
- https://bugzilla.mindrot.org/show_bug.cgi?id=1867
- http://thread.gmane.org/gmane.comp.encryption.kerberos.general/15855
- openssh-gssservkrb5-sec-bypass(99090) vdb-entry
- [oss-security] 20141202 CVE request: OpenSSH ~/.k5users patch (Fedora and downstreams) mailing-list