dovecot - Dec 2019 - CVE-2019-19722: Critical vulnerability in Dovecot

Open-Xchange Security Advisory 2019-12-13
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Product: Dovecot IMAP/POP3 Server
Vendor: OX Software GmbH
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Internal reference: DOV-3719
Vulnerability type: NULL Pointer Dereference (CWE-476)
Vulnerable version: 2.3.9
Vulnerable component: push notification driver
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 2.3.9.1
Researcher credits: Frederik Schwan, Michael Stilkerich
Vendor notification: 2019-12-10
Solution date: 2019-12-12
Public disclosure: 2019-12-13
CVE reference: CVE-2019-19722
CVSS: 5.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:F/RL:O/RC:C)
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Vulnerability Details:
Mail with group address as sender will cause a signal 11 crash in push
notification drivers. Group address as recipient can cause crash in some
drivers.
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Risk:
Repeated delivery attempts are made for the problematic mail, causing
queueing in MTA.
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Steps to reproduce:
1. Configure dovecot with push notifications enabled, such as OX push
notification driver. This can also be observed with 3rd party plugin XAPS.
2. Send mail a group address as sender
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Solution:
Operators should update to the latest Patch Release.


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> On 13/12/2019 12:44 Aki Tuomi <aki.tuomi at dovecot.fi> wrote:
> 
>  
> Open-Xchange Security Advisory 2019-12-13
> ?
> Product: Dovecot IMAP/POP3 Server
> Vendor: OX Software GmbH
> ?
> Internal reference: DOV-3719
> Vulnerability type: NULL Pointer Dereference (CWE-476)
> Vulnerable version: 2.3.9
> Vulnerable component: push notification driver
> Report confidence: Confirmed
> Solution status: Fixed by Vendor
> Fixed version: 2.3.9.1
> Researcher credits: Frederik Schwan, Michael Stilkerich
> Vendor notification: 2019-12-10
> Solution date: 2019-12-12
> Public disclosure: 2019-12-13
> CVE reference: CVE-2019-19722
> CVSS: 5.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:F/RL:O/RC:C)
> ?
> Vulnerability Details:
> Mail with group address as sender will cause a signal 11 crash in push
> notification drivers. Group address as recipient can cause crash in some
> drivers.
> ?
> Risk:
> Repeated delivery attempts are made for the problematic mail, causing
> queueing in MTA.
> ?
> Steps to reproduce:
> 1. Configure dovecot with push notifications enabled, such as OX push
> notification driver. This can also be observed with 3rd party plugin XAPS.
> 2. Send mail a group address as sender
> ?
> Solution:
> Operators should update to the latest Patch Release.
Turns out the fix was only partial fix, please update to 2.3.9.2 instead of
2.3.9.1. CVE remains the same.

Aki Tuomi
Open-Xchange oy
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