[CoLoCo] Possibly Stupid Ubuntu Question

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Ringo

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Dec 5, 2009, 5:37:53 PM12/5/09
to ubuntu...@lists.ubuntu.com
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Hey Ubunteros,

I have a quick question. I have the main Ubuntu repositories enabled as
well as some third party ones for other software I have. All of them use
pgp signatures to verify the downloads.

When Ubuntu looks for upgrades, one could theoretically put a backdoored
version of an upgrade (with a higher than possible version number) in
one of these third party repositories (or the community repos). If I
originally installed software from the official Ubuntu repos, is it
possible that apt would upgrade from a non-official one? If so, how
could I stop this and/or is there a way to see in synaptic/other
programs where the upgrades are coming from?

Thanks,
Ringo
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Kevin Fries

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Dec 5, 2009, 5:51:13 PM12/5/09
to Ubuntu Colorado Local Community Team
Ringo,

Apt will indeed upgrade from a third party repo if it is labeled as a newer version. This is on purpose. To stop that behavior google "debian apt pinning" I am not at my desk, so I can't check that exact search, but it should get you on the right path.

HTH
Kevin
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