5 Feb
2015
5 Feb
'15
10:03 a.m.
On 05 Feb 2015, at 15:54, Daniel-Constantin Mierla <miconda(a)gmail.com> wrote:
Just to give proper details about the issue ...
It is not that any 30x response sent by anyone was causing a crash, only
those received in a transaction and handled via get_redirects(), with an
empty URI in Contact header. That means an authenticated/trusted
endpoint has to be involved in such a call. The code causing it is also
quite old (might be close to 10 years now).
How was authentication involved? I
could repeat the crash without auth.
If someone is using this function towards phones and the phone responds with a
crafted 302 - which is now in the wild - we will crash if this module
and function is used - regardless of how old the code is. A crash is a crash.
In a situation a message sent as a response will cause Kamailio to crash.
That's no good.
Even if we hope that there is no one using it this way, we can't know.
In my view, this is clearly a security issue.
So there is no risk of being hit by malicious/unknown attackers from the
wild.
I don't agree with this assesment. We are allowed to have different
views :-)
Note that this is propably the first time I have seen this kind of issue with
Kamailio...
I propably have to add conflict resolution to my security vulnerability proposal ;-)
/O
Cheers,
Daniel
On 05/02/15 15:36, Olle E. Johansson wrote:
Friends,
I think today's issue with a 302 message sent to kamailio causing a crash is a
security issue. It was dealt with swiftly, but I feel we need a more formal procedure for
handling it, producing patches and releasing security information.
I've made a quick proposal that outlines a few simple things and policys. We should
make it too complex, but I feel it's important for all our users that a project has
some procedure on how to handle situations like this.
Please check the proposal in the dev meeting agenda and let's discuss it in the dev
meeting.
http://www.kamailio.org/wiki/devel/irc-meetings/2015a
/O
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--
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference, May 27-29, 2015
Berlin, Germany - http://www.kamailioworld.com
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