Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Sat, 23 Feb 2013 08:34:47 +0100
From: Marcus Meissner <>
To: OSS Security List <>
Subject: CVE Request: PackageKit"update" allows downgrade of packages when
	using the "zypp" backend


On openSUSE we have started to allow local logged in users to install
online updates (but not install new packages or remove ones), as this
seems a common and secure operation to us.
(Also done in light of the Linus Torvalds flame posting.)

PolicyKit rules in PackageKit also allow this in the vanilla version:
shipping default is "yes" for local logged-in active users.

So far we assumed that the update operation only allows upgrading versions.

The enforcement of this rule did not fully work, so at least the "zypp"
backend of PackageKit allowed downgrade of packages using this call.
The "update" method also allowed installing non-update resolvables like
patterns or even new packages.

We have not checked the other backends, they might also be affected.

As the default assumed secure behaviour is violated, this requires a CVE.

Ciao, Marcus

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.