SystemTap is an instrumentation system for systems running the Linuxkernel, version 2.6. Developers can write scripts to collect data on theoperation of the system. staprun, the SystemTap runtime tool, is used formanaging SystemTap kernel modules (for example, loading them).It was discovered that staprun did not properly sanitize the environmentbefore executing the modprobe command to load an additional kernel module.A local, unprivileged user could use this flaw to escalate theirprivileges. (CVE-2010-4170)Note: On Red Hat Enterprise Linux 4, an attacker must be a member of thestapusr group to exploit this issue. Also note that, after installing thisupdate, users already in the stapdev group must be added to the stapusrgroup in order to be able to run the staprun tool.Red Hat would like to thank Tavis Ormandy for reporting this issue.SystemTap users should upgrade to these updated packages, which containa backported patch to correct this issue.