This indicates an attack attempt against an information disclosure vulnerability in IBM bladecenter management module.
The vulnerability is caused by an error when the vulnerable software handles a specially crafted URL. It allows a remote attacker to steal cookie-based authentication credentials and other information.
IBM IBM BladeCenter Managemet Module BPET48L
Malicious users may be able to bypass certain security restrictions and compromise a vulnerable system.
Apply the patch supplied by the vendor.