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Random traffic outages when UserCheck is enabled on Security Gateway (CVE-2014-8951)
Symptoms
  • Random traffic outages when UserCheck is enabled on Security Gateway.

  • fwk0 core dump files contain the following stack:

    Core was generated by `fwk       '.
    Program terminated with signal 11, Segmentation fault.
    
    #0  0x... in strlen () from /lib/libc.so.6
    (gdb) bt
    #0  0x... in strlen () from /lib/libc.so.6
    #1  0x... in vfprintf () from /lib/libc.so.6
    #2  0x... in vsnprintf () from /lib/libc.so.6
    #3  0x... in snprintf () from /lib/libc.so.6
    #4  0x... in uc_set_redirect_url (handle=..., orig_url=... "SOME_URL", isFromTrap=0) at user_check_api.c
    ... ... ...
    
Cause

A redirect to the UserCheck page can cause the fwk0 process to crash, which causes traffic outage until this process is restarted.


Solution
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