A few new rules and some modifications to improve rule performance in today's release.
Apple iTunes Buffer Overflow (CVE-2009-0950):
Apple iTunes contains a programming error that may allow a remote attacker to execute code on a vulnerable system.
Rules to detect attacks targeting this vulnerability are included in this release and are identified with GID 1, SIDs 15703 through 15707.
Unisys Business Information Server Buffer Overflow (CVE-2009-1628):
The Unisys Business Information Server contains a programming error that may allow a remote attacker to execute code on an affected system.
A rule to detect attacks targeting this vulnerability is included in this release and is identified with GID 1, SID 15708.
As a result of ongoing research the Sourcefire VRT has added multiple rules to the SCADA, Oracle, specific-threats, chat, web-client and exploit rule sets to provide coverage for emerging threats from these technologies.
Advisory is located here: http://www.snort.org/vrt/advisories/2009/07/21/vrt-rules-2009-07-21.html