For example, previously such archive would display 'Cannot create file' message alone. Where appropriate, SFX archive displays the additional line with detailed error information provided by operating system. We would like to express our gratitude to Igor Sak-Sakovskiyfor bringing this issue to our attention.
Some other factors are also involved in limiting the practical application of this attack. Such attack is only possible if the intruder has managed to spoof or otherwise control user's DNS records. This is done to prevent a malicious web page from executing existing files on a user's computer. It also implements additional checks within the web notifier. WinRAR uses https instead of http in the web notifier window, home page and themes links.
We already prohibited extracting contents of such malformed archives in WinRAR 6.01.We are thankful to Jacob Thompson - Mandiant Advantage Labs for reporting this issue.
It is done to prevent possible attacks with inclusion of ZIP archive into the signature body.
ZIP SFX module refuses to process SFX commands stored in archive comment if such comment is resided after beginning of Authenticode digital signature.
