preben@xxxxxxxxxxx wrote: > Phishing through WinRAR 3.51 > Due to the build-up of WinRAR, some vital parts of the programs > functions and url's are visible through a simple HEX editor. This is not specific to WinRAR. It is true for almost every usual binary. Exceptions are only those using a compressor or obfuscation layer. > If a user want's to buy the full version of WinRar, the user can use > WinRAR's menu to access WinRars homepage. > Now if the file WinRAR.exe was altered at 0009BCC0, it would be possible > to conduct a phishing attack against the user. If the binary is modified, you are in far worse trouble than a mere phishing attack. If you can modify a binary, you can make it do anything. Like installing a keylogger, intercepting the banking data, even if it is entered into the original site, or your bank site. The only point is, that modifying some string is a bit easier than modifying functionality. However, this isn't of much value for programs that aren't run directly, but rather installed first. You simply wrap another installer around the existing installer executable (one that doesn't ask questions), install your keylogger stuff and then call the original installer. This is a generic process that only needs to be done once and can be accomplished with fairly standard tools. Even for programs that are usually directly executed without installation (like e.g. putty), a generic .EXE-infector as known from viri can be used. > In a realistic senario, the attacker could spread the modified file(s), > through file sharing networks or download sites. If you run software from untrusted sources, phishing is one of your smallest problems. > Other versions of WinRAR might be vulnerable as well. About every software that shows builtin external URLs to the user at some point is "vulnerable" to that. If we go to the scenario of a user running an untrusted binary, all is lost anyway. Kind regards, Andreas Beck -- Andreas Beck http://www.bedatec.de/
