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OpenSSH < 6.6 Remote Restriction Bypass Vulnerability



The remote SSH service may be affected by a restriction bypass vulnerability.


Versions of OpenSSH server before 6.6 are unpatched for a restriction bypass vulnerability related to wildcard usage in the 'AcceptEnv' configuration setting within sshd_config. This could be leveraged by an attacker to bypass environment restrictions via a specially crafted request.

Note: PVS has solely relied on the banner of the SSH client to perform this check. Any backported patches or workarounds such as recompiling or edited configurations are not observable through the banner.


Upgrade to OpenSSH version 6.6 or later.