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0 pointsdns_snek5mo ago0 comments

> because there is no guarantee that what one persons gets the same what anybody else gets, so any kind of chance to even discover a compromise is lost.

This applies to "curl | bash", "download an exe and run it", and everything in between equally. If a malicious binary wants to cover up its tracks it can just delete itself and disappear just like "curl | bash" would.

Feel free to educate users about the importance of installing software from trusted repositories whenever possible but demonizing "curl | bash" like it's somehow uniquely terrible is just silly and misses the point completely.

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uecker5mo ago

With a binary, one can compare a hash or store a copy on the binary on another computer. And one person doing this might be enough to figure out something is wrong. But even if people don't, it needs additional effort by the attacker to search for the binary and clean up their tracks, which also creates more opportunities for detection. It is really not at all comparable to "curl | bash". You sound like the people who told me two decades ago that reproducible builds are a waste of time.

dns_snekOP5mo ago

> With a binary, one can compare a hash

You lift a suspected binary from a machine that's under suspicion. You hash it and it matches a known good file. You declare victory, pat yourself on the back, and return it back into service. 3 months later all of your data is exfiltrated because you assumed that your attacker is an idiot.

> it needs additional effort by the attacker to search for the binary

Additional effort:

    #include "stdio.h"
    #include "unistd.h"
    
    void main() {
      char path[512];
      readlink("/proc/self/exe", path, sizeof(path));
      unlink(path);
      printf("Poof, I disappeared from: %s\n", path);
    }

> You sound like the people who told me two decades ago that reproducible builds are a waste of time.

Except I wouldn't say that because these ideas are completely unrelated. Define your threat model and specify what problem you're trying to solve. Don't be the type of person who encrypts passwords because they heard that encryption is good for protecting data.

You demonized curl|bash because it "doesn't have a proper trust chain" and attacked the project for "not understanding security" with really weak arguments, now you're retreating all the way back to claim some fringe benefits to maybe-possibly discover the source of infection, and only if your attacker is lazy not to try to cover their tracks.

Continuing that argument like it's the same one you originally presented is quite a disrespectful way of wasting people's time: https://en.wikipedia.org/wiki/Motte-and-bailey_fallacy

uecker5mo ago

You can copy the binary on a different system before installing it, or compute the hash before you run it. This is not hard. And even if you are not copying to another system, the attacker needs to find all copies of the binary and modify them. Also note that the installer binary / script is not the same as the binary that later runs. And any additional effort the attacker has to do to hide its tracks also increases chances for detection, this is also something that can be learned from XZ backdoor.

j / k navigate · click thread line to collapse

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uecker5mo ago

dns_snekOP5mo ago

> With a binary, one can compare a hash

> it needs additional effort by the attacker to search for the binary

Additional effort:

    #include "stdio.h"
    #include "unistd.h"
    
    void main() {
      char path[512];
      readlink("/proc/self/exe", path, sizeof(path));
      unlink(path);
      printf("Poof, I disappeared from: %s\n", path);
    }

> You sound like the people who told me two decades ago that reproducible builds are a waste of time.

Continuing that argument like it's the same one you originally presented is quite a disrespectful way of wasting people's time: https://en.wikipedia.org/wiki/Motte-and-bailey_fallacy

uecker5mo ago

j / k navigate · click thread line to collapse