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Multiple 7-Zip Vulnerabilities Discovered

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Re: Multiple 7-Zip Vulnerabilities Discovered

#71

Earlier quoted context omitted.

You can be appalled, but it's not like anyone's paying them for the work that they do. If you want to help them, I'm sure you could contribute some additions to their build process or something that would help them tighten up security. But I think it's funny that you're so shocked that a popular free software project isn't perfect. Be the change you want to see. PS: who cares if the devs are using unsigned software d…

Not everyone has enough bandwidth in their lives to actively fix every broken free/open source project out there. Rather than being seen as attacks on a project, these sorts of comments are often just highlighting some things that whoever is looking at that particular project might want to fix. The "don't criticise unless you're prepared to fix it" attitude is very similar to the sort of "Don't bring me problems, jus…

I made specific criticisms about the parent poster being "appalled". Those are the kinds of comments that programmers on open source projects don't read, because they start "I'm appalled at how irresponsible your project is", and no one wants to read something like that.

Rather than leaving comments about how astounded we are, we should come up with a solution (which I'll note wasn't even mentioned in the parent post). Maybe a build step to autoregen the Downloads page? Maybe an email to the developers that will ask nicely for them to note which bug fixes are for security and which ones aren't?

Omission of facts is sometimes a defense mechanism for people who are embarrassed. The parent post could have only made the developer's insecurity about security greater. I understand that we have to make criticisms about open source software, but maintaining an open source project can sometimes be totally thankless work. We should try our best to Be Nice to people who work for free, because otherwise they won't want to work at all.

Re: Multiple 7-Zip Vulnerabilities Discovered

#72
post #64
post #63

Earlier quoted context omitted.

Their conclusion is simply that "the major part has been fixed" in MS12-024, and that you should be careful if you write a self-extracting installer. No big deal.

I have a bunch of samples right now that fake signatures. Here's one example: https://virustotal.com/en/file/fe8fa4daa404ebb3bd6df4c20650a... All of them are self-extracting installers (happen to be 7zip/Nullsoft). That successfully fake sigs. Nullsoft is the most popular packer/extractor out there. Sure, there are ways of creating an installer with authenticode that cannot be faked, but much easier to just hash it a…

The SHA256 of that file is exactly that of Firefox Setup Stub 35.0.1 (Win32), so of course Authenticode checks out.

I'm not 100% sure why some people thought it was a malicious file, but the comments on Virustotal mention [1] which, for me, redirects to the legitimate [2] but a comment seems to link it with [3] which is a completely different file. Perhaps the redirection is randomized so people got confused?

[1] hxxp://files.dodo-number-1.pw/p/MCLkP8Dzc3nUWJrG9fwGLA,1442015273/zte%20mf631%20firmware%20downlo_10924_i57945825_il345.exe (replace hxxp with http)

[2] https://download-installer.cdn.mozilla.net/pub/firefox/relea...

[3] https://www.virustotal.com/es/file/e6821e86a9d3fb693b32077e6...

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