Any permanent fix to the vulnerability is yet to be released as of now.  The best way to be secure is to keep your Antivirus program updated and not to click any  kind of similar sounding files from any untrusted source.

WinRAR Spoofing Vulnerability used by Hackers to Hide Malware in Compressed files    TechWorm - 55WinRAR Spoofing Vulnerability used by Hackers to Hide Malware in Compressed files    TechWorm - 88