The above directive should be placed in the Host * section of the configuration file to use this setting for all SSH servers the client connects to. In Red Hat Enterprise Linux 7 you can mitigate this issue by setting the following option in the OpenSSH client's configuration file, either global ( /etc/ssh/ssh_config) or user specific ( ~/.ssh/config): UseRoaming no The OpenSSH packages were updated from version 6.4 to version 6.6 in Red Hat Enterprise Linux 7.1 via RHSA-2015:0425. Red Hat Enterprise Linux 7 prior to version 7.1 (released in March 2015) provides OpenSSH 6.4 and is impacted regardless of the use of the Prox圜ommand settings.
#OPENSSH 7.1 UPDATE#
Security update RHSA-2016-0043 corrects this issue. OpenSSH 6.6 is only vulnerable to this issue when used with certain non-default Prox圜ommand settings. Red Hat Enterprise Linux 7 since version 7.1 has provided OpenSSH 6.6 for which the default configuration is not affected by this flaw.Red Hat Enterprise Linux 4, 5, and 6 are not affected by this flaw because they include OpenSSH versions older than 5.4, and hence do not implement the roaming feature.Man-in-the-middle (MITM) attackers can not exploit this issue. Note that this flaw can only be triggered after successful authentication and therefore can only be exploited by a malicious or compromised SSH server. This issue has been assigned CVE-2016-0777, and was rated as having Moderate impact by Red Hat Product Security. The information leak is exploitable in the default configuration of certain versions of the OpenSSH client and could (depending on the client's version, compiler, and operating system) allow a malicious SSH server to steal the client's private keys. The roaming feature is enabled by default in OpenSSH clients, even though no OpenSSH server version implements the roaming feature.Īn information leak flaw was found in the way OpenSSH client roaming feature was implemented. If a connection to an SSH server breaks unexpectedly, and if the SSH server supports roaming as well, the client is able to reconnect to the server and resume the interrupted SSH session. Since version 5.4, the OpenSSH client supports an undocumented feature called roaming.
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