The following ERRATA for SL 301,302,303,304,305 i386 are now available from:
ftp://ftp.scientificlinux.org/linux/scientific/301,302,303,304,305/i386/errata/SL/RPMS/

Synopsis:          Important: thunderbird security update
Advisory ID:       RHSA-2005:791-01
CVE Names:   CAN-2005-2871 CAN-2005-2702 CAN-2005-2703 CAN-2005-2704 
CAN-2005-2705 CAN-2005-2706 CAN-2005-2707 CAN-2005-2968

   thunderbird-1.0.7-1.4.1.SL3.i386.rpm