this post was submitted on 10 Jul 2023
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Lemmy security vulnerability update (feddit.uk)
submitted 1 year ago* (last edited 1 year ago) by tom to c/feddituk
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So last night a XSS scripting attack was found on all Lemmy instances. See the lemmy world update here https://feddit.uk/post/453040

What this means is that hackers could inject their own "script" when any user viewed a comment/post that the hackers made. The hackers would then grab your JWT token with the script so they could impersonate that user. (And perform any actions on behalf of the user)

Luckily, it looks like I haven't been compromised so the site config should all be the same

What has been done about this

I've removed any comments or posts which included the script see here https://github.com/LemmyNet/lemmy-ui/issues/1895

I would have removed all custom emojis as well but there was none in our DB, this may potentially mean that this site was not affected. Just in case, I've also rotated the JWT tokens so all tokens are now invalid. This means you will have to logout and log back into the instance

Shoutout to @clara@feddit.uk for messaging me about this and bringing it to my attention

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[–] Emperor 15 points 1 year ago

Thanks for doing this, sounds like people were on the ball and managed to sort it quickly.

I imagine the code will be probed quite a bit and this won't be the last time, the important thing is to move fast and sort it out.

[–] snake_case 9 points 1 year ago

Thanks for jumping on this so quickly! And all work you're doing to support this new platform!!

[–] JesusTheCarpenter 7 points 1 year ago

Thank you for your concern and the detailed update!

[–] RelentlessArts 7 points 1 year ago

Thanks Tom and Clara.

[–] Digestive_Biscuit 5 points 1 year ago* (last edited 1 year ago) (3 children)

Great job!

I don't know if it's related. Since today when I login to the Jerboa app then try to post or close/reopen the app my account for feddit.uk disappears from the app. I have to keep logging in.

[–] Cyber 2 points 1 year ago

Just to say, mine seems ok after closing and reopening the app... but I'll check again later.

[–] fakeman_pretendname 2 points 1 year ago (1 children)

You may need to clear the cache and data for Jerboa on your phone first, then log back in.

[–] Digestive_Biscuit 1 points 1 year ago

Thanks for the tip. I just tried that, didn't work. So I then I deleted all data and that did! It meant I had to login to all my accounts again but it seems to be working.

[–] Noodle_lover 1 points 1 year ago

Same issue for me. Also using Jerboa.

[–] addie 5 points 1 year ago

Cool! Thanks Tom, appreciate the update and the speedy response.

[–] cloudless 4 points 1 year ago (1 children)

I got a connection error trying to use your wefwef instance. Is this related to the update?

https://app.feddit.uk

[–] tom 3 points 1 year ago

Yeh fixed and fixed the issue where updating broke it so that shouldn't happen anymore

[–] PCurd 3 points 1 year ago (2 children)

Might not be related but after signing out I’ve not been able to sign back in to app.feddit.uk - using vger.app works fine though.

[–] Emperor 3 points 1 year ago (1 children)

I think Tom.said that it breaks every time there's an update.

[–] PCurd 2 points 1 year ago

I just saw his post about doing an update - it’s let me in now

[–] RelentlessArts 1 points 1 year ago

I've been able to sign into the generic wefwef webapp so unsure if there is a difference with the Feddit version.

[–] Fudgy 3 points 1 year ago

Thanks for keeping us all safe.. :)

[–] clara 1 points 1 year ago

glad you managed to protect our instance before anything bad happened, good job 🥳 i was worried i'd wake up to a rather spicy looking front page lol. thanks for the hard work!

[–] Flax_vert 1 points 1 year ago (1 children)

Ty for acting, however I cannot seem to log in on Jerboa. It shows me all of my subscribed feeds but then won't let me comment. Closing and reopening the app logs me out again

[–] fakeman_pretendname 1 points 1 year ago (1 children)

You may need to clear the cache and data for Jerboa on your phone first, then log back in. I was having the same issue, but that seemed to fix it for me.

[–] Flax_vert 1 points 1 year ago

Yep, fixed it for me also