To recreate:
1 - Set a patron's password to secret*
2 - Attempt a patron information request via the sip clip emulator:
    perl misc/sip_cli_emulator.pl -su term1 -sp term1 -l CPL -a localhost -p 6001 -m patron_information --patron ballard --password secret*
3 - It fails?
4 - Set password to secret*s
5 - Repeat
    perl misc/sip_cli_emulator.pl -su term1 -sp term1 -l CPL -a localhost -p 6001 -m patron_information --patron ballard --password secret*s
6 - It succeeeds

Offending line(s) appears to be:
366           $buffer =~ s/^\s*[^A-z0-9]+//s;
367 # Every line must start with a "real" character.  Not whitespace, control chars, etc.
368           $buffer =~ s/[^A-z0-9]+$//s;
369 
370 # Same for the end.  Note this catches the problem some clients have sending empty fields at the end, like |||