this post was submitted on 02 Jan 2024
826 points (99.4% liked)
Programmer Humor
32371 readers
425 users here now
Post funny things about programming here! (Or just rant about your favourite programming language.)
Rules:
- Posts must be relevant to programming, programmers, or computer science.
- No NSFW content.
- Jokes must be in good taste. No hate speech, bigotry, etc.
founded 5 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
How does this exploit work? I understand that inputs were not sanitized, but what did the injected code do?
My guess would be the response text is passed through a rudimentary templating engine that looks for
{and}. Somehow it must be processing the whole chat history. The templater fails at the unexpected braces in the code block and then just gives up (probably a try-catch ignores the error and sends the message anyway).So the attack would just be a
}then?I don't think the code is doing anything, it looks like it might be the brackets.
That effectively the spam script has like a greedy template matcher that is trying to template the user message with the brackets and either (a) chokes on an exception so that the rest is spit out with no templating processor, or (b) completes so that it doesn't apply templating to the other side of the conversation.
So
{ a :'b'}might work instead.