Auth bypass in Openbsd Openssh
CVE-2016-1908
The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a fallback and obtain trusted X11…
Vulnerability class: Broken Authentication
EPSS: 0.024 (85.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Openbsd Openssh
- Oracle Linux — versions 6, 7
- Debian Debian_linux — versions 8.0
- Redhat Enterprise_linux_desktop — versions 6.0, 7.0
- Redhat Enterprise_linux_eus — versions 7.2, 7.3, 7.4
- Redhat Enterprise_linux_server — versions 6.0, 7.0
- Redhat Enterprise_linux_server_aus — versions 7.2, 7.3, 7.4
- Redhat Enterprise_linux_server_tus — versions 7.2, 7.3, 7.6
- Redhat Enterprise_linux_workstation — versions 6.0, 7.0
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Release Notes, Vendor Advisory)
- secalert@redhat.com (Third Party Advisory)
- secalert@redhat.com (Patch, Third Party Advisory)
- secalert@redhat.com (mailing-list, Mailing List, Third Party Advisory)
- secalert@redhat.com (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
- secalert@redhat.com (vendor-advisory, Third Party Advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory)
- secalert@redhat.com (Patch, Third Party Advisory, Issue Tracking)
- secalert@redhat.com (mailing-list, Mailing List, Third Party Advisory)
- secalert@redhat.com (VDB Entry, Third Party Advisory, vdb-entry)
Frequently asked questions
- What is CVE-2016-1908?
- CVE-2016-1908 is a critical-severity vulnerability in Openbsd Openssh, classified under Improper Authentication. CVSS score: 9.8/10. Published 2017-04-11.
- How severe is CVE-2016-1908?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2016-1908 known to be exploited?
- 10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.