У меня тоже ничего подозрительного
[root@localhost bin-classic]# ldd /usr/sbin/fb_inet_server
linux-gate.so.1 => (0x00e0b000)
libfbembed.so.2.5 => /usr/lib/libfbembed.so.2.5 (0x42747000)
libdl.so.2 => /lib/libdl.so.2 (0x48cfa000)
libncurses.so.5 => /lib/libncurses.so.5 (0x4a11e000)
libtinfo.so.5 => /lib/libtinfo.so.5 (0x49f2f000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x49e3f000)
libm.so.6 => /lib/libm.so.6 (0x48d0c000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x48d38000)
libpthread.so.0 => /lib/libpthread.so.0 (0x48cde000)
libc.so.6 => /lib/libc.so.6 (0x48b50000)
libicuuc.so.44 => /usr/lib/libicuuc.so.44 (0x4a989000)
libicudata.so.44 => /usr/lib/libicudata.so.44 (0x4ab30000)
libicui18n.so.44 => /usr/lib/libicui18n.so.44 (0x4bb99000)
/lib/ld-linux.so.2 (0x48b2f000)
[root@localhost bin-classic]# ldd /usr/lib/firebird/UDF/index.so
linux-gate.so.1 => (0x007d1000)
libpthread.so.0 => /lib/libpthread.so.0 (0x00877000)
libdl.so.2 => /lib/libdl.so.2 (0x00a9b000)
libc.so.6 => /lib/libc.so.6 (0x00153000)
/lib/ld-linux.so.2 (0x48b2f000)
С уважением, Владимир.