Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Sat, 10 Dec 2016 01:49:34 +0100
From: Mathieu Pasquet <>
Subject: Re: CVE Request: MCabber: remote attackers can modify
 the roster and intercept messages via a crafted roster-push IQ stanza

On Fri, Dec 09, 2016 at 09:19:06PM +0100, Salvatore Bonaccorso wrote:
> Hi
> Sam Whited discovered that MCabber versions 1.0.3 and before, was
> vulnerable to an attack identical to Gajim's CVE-2015-8688 [1] which
> can lead to a malicious actor MITMing a conversation, or adding
> themselves as an entity on a third parties roster (thereby granting
> themselves the associated priviledges such as observing when the user
> is online).
> The issue was fixed in the 1.0.4 release, with patch found at [2].
> Can a CVE be assigned for this issue?
> Regards,
> Salvatore
>  [1]
>  [2]

>  [3]


I would like to mention that when Sam mentioned it to the MCabber team,
I investigated the slixmpp [1] codebase to see if we we were equally
vulnerable. It appeared that the default roster mechanism already has a
check in place, but it creates a general event before then, which could
be received by another handler to re-implement a Roster differently
(like we do in poezio [2]).

This specific bug has been corrected in [3] and [4], which are available
in slixmpp 1.2.3 (all previous versions are affected).

I’m not sure if this specific part warrants a CVE, as it is quite a
specific case (but people could send arbitrary roster pushes to poezio
before then), but I thought it would be good to mention. If it is
considered a real security flaw, I have to say that SleekXMPP [5] [6] is
also affected, and I will patch it if needed.


 [2] /

Mathieu Pasquet (mathieui)

Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)

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.