this post was submitted on 30 Sep 2024
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OpenPrinting News Flash - cups-browsed Remote Code Execution vulnerability (openprinting.github.io)
submitted 1 month ago by pnutzh4x0r@lemmy.ndlug.org to c/linux@lemmy.ml
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Exploit of a combination of several bugs - Overhyped but not that severe - Fixes already available

...

Canonical’s security team has acted immediately to quickly apply the patches which Michael Sweet (author and maintainer of CUPS) had already prepared for CUPS, cups-browsed, libcups-filters, libppd, and cups-filters (in the time from the first report until then I was some days off and I was also on the Open Source Summit Europe, thanks, Michael Sweet, for stepping in, also thanks to Zdenek Dohnal from Red Hat) to the appropriate in all supported Ubuntu versions, so that at the time of disclosure most fixes were already in place. They also reported in an Ubuntu blog. They tell users what to do, from turning off cups-browsed or at least its legacy CUPS browsing support to updating their systems as the fixes were already available. Thanks a lot to Seth Arnold, Marc Deslauriers, Diogo Sousa, Mark Esler, Luci Stanescu, and more.

...

The X post really overhyped the vulnerability. Attacks from the internet are not very probable due to the fact that servers on the internet do not have cups-browsed and CUPS installed and CUPS/cups-browsed setups are there usually only in NAT-protected local networks with desktop machines and print servers. And the remote code execution is also rather restricted, as CUPS filters are not running as root, but as the system user “lp” which cannot even read user’s home directories. In addition, the remote code execution only happens when a user actually prints a job on the fake printer. Actually assigned scores ended up between 8.4 and 9.1.

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[–] mlg@lemmy.world 1 points 1 month ago

I don't know why the guy just assumed every linux and BSD machine runs cups-browsed by default?

It took me literally 5 seconds to check that it's disabled on Fedora by default.

Then he wrote a whole paragraph about how no one should use CUPS for printing because based off of his own analysis, it's some insanely crappy and insecure system.

Which is actually stupid because the only alternative is windows?????????? Which is universally known for printer driver and spooler vulnerabilities.

Then he got mad the the maintainer for patching before his disclosure.....