This indicates an attack attempt to exploit a Directory Traversal Vulnerability in RARLAB WinRAR.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted ACE file. An attacker can exploit this by tricking an unsuspecting user into opening a malicious ACE file and execute arbitrary code within the context of the application.
RARLAB WinRAR prior to 5.70 beta 1
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.