CVE-2015-6563: The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username da...
The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c.
Security readout for executives and security teams
CVE-2015-6563 is an OpenSSH server issue affecting non-OpenBSD platforms before OpenSSH 7.0. It is not a remote drive-by bug: an attacker needs local-level access conditions and high privileges. The business risk is strongest on legacy systems where SSH remains exposed and patch history is unclear. Exposure is most likely on older Linux, Unix, macOS, appliance, or embedded systems running OpenSSH before 7.0, especially where vendor backports are not tracked. OpenBSD is excluded by the CVE description. Treat this as a legacy hygiene and privilege-bound exposure issue. It should not displace actively exploited internet-facing vulnerabilities, but unresolved OpenSSH before 7.0 should be removed from production because SSH is security-critical infrastructure. Mitigation focus: Upgrade OpenSSH to 7.0 or a vendor-fixed package.; Check OS and appliance vendor advisories for backported fixes.; Prioritize internet-facing or shared SSH hosts with legacy OpenSSH..
Prepared
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Potential ATT&CK relevance
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1CVSS vectors
3Timeline events
2ADP providers
8Source links
SSVC decision data
CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total
CVSS vector scores
1 official score
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