I got these messages in my Disk Utility log after a friend of mine logged into a private mail server site using my computer. Is this a security problem?

2010-06-10 21:10:59 -0400: Warning: SUID file "Applications/Utilities/Keychain Access.app/Contents/Resources/kcproxy" has been modified and will not be repaired.
2010-06-10 21:12:11 -0400: Warning: SUID file "usr/libexec/authopen" has been modified and will not be repaired.
2010-06-10 21:12:12 -0400: Warning: SUID file "usr/libexec/security_authtrampoline" has been modified and will not be repaired.


Mid 2010 MacBook Pro 13"
2.4GHz, 750GB SATA HD, 8 GB RAM, OS 10.7.5
1 HDX1500 2TB Ext.HD, 2 HDX1500 1TB Ext.HD
HP Laserjet 6MP printing postscript via 10/100 Intel print server
Netgear WN2500RP Range Extender (Ira rocks!)
Linksys WRT1900AC Wireless Router
Brother MFC-9340CDW Color Laser
iPad Air