[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <5a83fed905374f2fa03babb6c7c1da61@imshyb01.MITRE.ORG>
Date: Tue, 31 Jan 2017 10:22:47 -0500
From: <cve-assign@...re.org>
To: <dx@...one.com.ar>
CC: <cve-assign@...re.org>, <oss-security@...ts.openwall.com>
Subject: Re: CVE Request - Remote DoS vulnerabilities in BitlBee
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
> I've just released BitlBee 3.5.1 which includes fixes for these issues:
>
> a) bitlbee-libpurple: Use after free when expiring file transfer requests.
> b) Null pointer dereference with file transfer request from unknown contacts.
> c) Incomplete fix for issue (b), which left bitlbee-libpurple affected.
>
> I have already requested three CVEs to the distros mailing list when
> the issue was not public, but did not receive any reply at the time of
> this writing. If it is appropriate, I'd like to request them in this
> list instead.
>
> The first two were already public (fixed in 3.5, released 2017-01-08) but were
> not considered security issues before. The third issue is what 3.5.1
> fixes.
> https://bugs.bitlbee.org/ticket/1281
>
> # bitlbee-libpurple: Use after free when expiring file transfer requests
>
> Pending file transfer requests expire after 120 seconds, which may
> result in use after free if the corresponding account is disconnected.
> A malicious remote server could force this disconnection.
>
> This results in denial of service (remote crash of the BitlBee
> instance), or remote code execution (theoretically).
>
> * Authentication: None
>
> ## Unaffected versions
>
> bitlbee (non-libpurple builds), any version
>
> bitlbee-libpurple 3.5
>
> This affects any libpurple protocol when used through BitlBee. It does
> not affect other libpurple-based clients such as pidgin.
>
> This is a very visible issue - all file transfer request attempts and
> all disconnections will be logged in the control channel and visible
> by the targeted user. File transfer requests look like this:
>
> <@root> [account] - File transfer request from [username] for [filename] (0 kb).
> <@root> Accept the file transfer if you'd like the file. If you don't, issue the 'transfer reject' command.
>
> Cancelling the file transfer request using the "transfer reject"
> command before the disconnection happens can prevent this. However,
> using that command after the account is disconnected will result in an
> immediate crash.
> [] Original bugfix commit:
>
> https://github.com/bitlbee/bitlbee/commit/ea902752503fc5b356d6513911081ec932d804f2
Use CVE-2016-10188.
> https://bugs.bitlbee.org/ticket/1282
>
> # Null pointer dereference with file transfer request from unknown contacts
>
> Receiving a file transfer request from a contact not in the contact
> list results in a null pointer dereference, leading to remote DoS by
> malicious remote clients.
>
> * Authentication: None
>
> ## Unaffected versions
>
> bitlbee-libpurple 3.5.1 or newer
>
> bitlbee (non-libpurple builds) 3.5 or newer
>
> The issue from 3.4.2 and older only affects the jabber protocol, which
> is the only non-purple protocol which implements file transfers.
>
> The issue that is still present in 3.5 affects any libpurple protocol
> that implements file transfers when used through BitlBee. It does not
> affect other libpurple-based clients such as pidgin.
>
> There's no visible effect of the issue other than the crash.
> [] Incomplete fix commit included in 3.5:
>
> https://github.com/bitlbee/bitlbee/commit/701ab8129ba9ea64f569daedca9a8603abad740f
Use CVE-2016-10189 for the issue with Jabber file transfers that was
fixed by this commit.
> [] Libpurple specific bugfix commit included in 3.5.1:
>
> https://github.com/bitlbee/bitlbee/commit/30d598ce7cd3f136ee9d7097f39fa9818a272441
Use CVE-2017-5668.
CVE-2017-5668 exists because of an incomplete fix for CVE-2016-10189.
- --
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
[ A PGP key is available for encrypted communications at
http://cve.mitre.org/cve/request_id.html ]
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1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=oUx2
-----END PGP SIGNATURE-----
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.
