CVE-2016-1908: The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and relie...
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 forwarding privileges by leveraging configuration issues on this X11 server, as demonstrated by lack of the SECURITY extension on this X11 server.
Security readout for executives and security teams
This is an OpenSSH client flaw affecting versions before 7.2 when untrusted X11 forwarding is used. A remote X11 client could receive trusted X11 forwarding privileges if the user’s local X11 server is misconfigured, such as lacking the SECURITY extension. Exposure is most likely on Linux or Unix workstations and jump hosts using OpenSSH client versions before 7.2 with X11 forwarding enabled, especially when connecting to untrusted or compromised remote systems. Server-only OpenSSH deployments are less directly relevant based on the cited description. Prioritize remediation for administrator and developer workstations that use SSH with X11 forwarding. The business risk is unauthorized access through trusted X11 forwarding, but exposure depends on specific client use and local X11 configuration. Mitigation focus: Upgrade OpenSSH client to 7.2 or a vendor-patched package.; Review applicable vendor advisories for backported fixes.; Disable X11 forwarding where it is not operationally required..
Prepared
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Potential ATT&CK relevance
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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cwe · medium confidence lookup
CWE-287: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
1CVSS vectors
3Timeline events
2ADP providers
6Source links
SSVC decision data
CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: total
CVSS vector scores
1 official score
We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
CWE-287 · source CWE mapping
Improper Authentication
Improper Authentication represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.