CVE-2016-1908

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Summary

CVECVE-2016-1908
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-04-11 18:59:00 UTC
Updated2025-04-20 01:37:25 UTC
DescriptionThe 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 forwarding privileges by leveraging configuration issues on this X11 server, as demonstrated by lack of the SECURITY extension on this X11 server.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-287 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary7.5AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:L/Au:N/C:P/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 8.0 All All All
Application Openbsd Openssh All All All All
Operating System Oracle Linux 6 - All All
Operating System Oracle Linux 7 - All All
Operating System Redhat Enterprise Linux Desktop 6.0 All All All
Operating System Redhat Enterprise Linux Desktop 7.0 All All All
Operating System Redhat Enterprise Linux Eus 7.2 All All All
Operating System Redhat Enterprise Linux Eus 7.3 All All All
Operating System Redhat Enterprise Linux Eus 7.4 All All All
Operating System Redhat Enterprise Linux Eus 7.5 All All All
Operating System Redhat Enterprise Linux Eus 7.6 All All All
Operating System Redhat Enterprise Linux Eus 7.7 All All All
Operating System Redhat Enterprise Linux Server 6.0 All All All
Operating System Redhat Enterprise Linux Server 7.0 All All All
Operating System Redhat Enterprise Linux Server Aus 7.2 All All All
Operating System Redhat Enterprise Linux Server Aus 7.3 All All All
Operating System Redhat Enterprise Linux Server Aus 7.4 All All All
Operating System Redhat Enterprise Linux Server Aus 7.6 All All All
Operating System Redhat Enterprise Linux Server Aus 7.7 All All All
Operating System Redhat Enterprise Linux Server Tus 7.2 All All All
Operating System Redhat Enterprise Linux Server Tus 7.3 All All All
Operating System Redhat Enterprise Linux Server Tus 7.6 All All All
Operating System Redhat Enterprise Linux Server Tus 7.7 All All All
Operating System Redhat Enterprise Linux Workstation 6.0 All All All
Operating System Redhat Enterprise Linux Workstation 7.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
www.openssh.com/txt/release-7.2 af854a3a-2127-422b-91ae-364da2661108 www.openssh.com Release Notes, Vendor Advisory
OpenSSH X11 Forwarding Flaw Lets Users Bypass Trust Restrictions - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com Broken Link, Third Party Advisory, VDB Entry
[SECURITY] [DLA 1500-1] openssh security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com Third Party Advisory
OpenSSH CVE-2016-1908 Security Bypass Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Third Party Advisory, VDB Entry
openssh.git - Portable OpenSSH af854a3a-2127-422b-91ae-364da2661108 anongit.mindrot.org Patch, Third Party Advisory
oss-security - Re: Qualys Security Advisory - Roaming through the OpenSSH client: CVE-2016-0777 and CVE-2016-0778 af854a3a-2127-422b-91ae-364da2661108 openwall.com Mailing List, Third Party Advisory
Bug 1298741 – CVE-2016-1908 openssh: possible fallback from untrusted to trusted X11 forwarding af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Patch, Third Party Advisory
cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf af854a3a-2127-422b-91ae-364da2661108 cert-portal.siemens.com
Oracle Linux Bulletin - April 2016 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Third Party Advisory
OpenSSH: Multiple vulnerabilities (GLSA 201612-18) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 38906 OpenSSH Improper Failed Cookie Generation Handling Vulnerability (CVE-2016-1908)
  • 591280 Siemens SCALANCE X-200RNA Switch Devices Denial of Service (DoS) Multiple Vulnerabilities (ICSA-22-349-21, SSA-412672)
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