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KB-10066: SSHD Connectivity via RSA on RHEL Servers Showing a Segfault after the Latest Kernel Update

Centrify DirectControl ,  

1 April,18 at 02:44 AM

Problem:
After the Linux kernel update was installed, the customer tried to connect to the server via SSHD with and RSA device. They get an error saying "327 kernel: sshd[3485]: segfault at 70 ip 00007f5796fb0d57 sp 00007fff90c2ce98 error 4 in sshd[7f5796f36000+d2000]"

Resolution:
In the sshd_config file for the stock SSHD (5.3p1) there is a line :

UsePrivilegeSeparation

The RSA ACE/SecurID installation is calling for it to be set to no:

UsePrivilegeSeparation no

The Centrify SSHD install merges configuration directives from the stock SSHD install and then disables it and takes its place. This option crashes the SSH server.
The correct configuration for this version of SSHd (7.4p1) should be:

UsePrivilegeSeparation sandbox

After making this change, the RSA/SecurID works without an issue.

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