Description
The verify_host_key function in sshconnect.c in the client in OpenSSH 6.6 and earlier allows remote servers to trigger the skipping of SSHFP DNS RR checking by presenting an unacceptable HostCertificate.
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openssh | 1:6.6p1-1 | — |
| Debian 13 | openssh | 1:6.6p1-1 | — |
| Debian 12 | openssh | 1:6.6p1-1 | — |
| Debian 7 | openssh | 1:6.0p1-4+deb7u1 | DSA-2894-1 |
| Debian 6.0 | openssh | 1:5.5p1-6+squeeze5 | DSA-2894-1 |
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 |
| RHEL 6 | openssh +4 | 5.3p1-104.el6 | RHSA-2014:1552 |
| RHEL 6 | pam_ssh_agent_auth | 0.9.3-104.el6 | RHSA-2014:1552 |
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 4
- RHSA-2015:0425 Red Hat Security Advisory: openssh security, bug fix and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2014:1552 Red Hat Security Advisory: openssh security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-2894-1 openssh - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ELSA-2015-0425 Moderate: openssh security, bug fix and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 9, 2015
References
- USN-2164-1 vendor-advisory
- 59855 third-party-advisory
- RHSA-2015:0425 vendor-advisory
- http://advisories.mageia.org/MGASA-2014-0166.html
- HPSBUX03188 vendor-advisory
- 66459 vdb-entry
- MDVSA-2015:095 vendor-advisory
- [oss-security] 20140326 CVE request: openssh client does not check SSHFP if server offers certificate mailing-list
- FEDORA-2014-6380 vendor-advisory
- DSA-2894 vendor-advisory
- RHSA-2014:1552 vendor-advisory
- http://aix.software.ibm.com/aix/efixes/security/openssh_advisory4.asc
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742513
- FEDORA-2014-6569 vendor-advisory
- MDVSA-2014:068 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html