CVE-2019-11499: Submission-login crashes when authentication is started over TLS secured channel and invalid authentication message is sent

[Aki Tuomi]

Open-Xchange Security Advisory 2019-04-30
Product: Dovecot
Vendor: OX Software GmbH

Internal reference: DOV-3223 (Bug ID)
Vulnerability type: CWE-617
Vulnerable version: 2.3.0 - 2.3.5.2
Vulnerable component: submission-login
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 2.3.6
Vendor notification: 2019-03-11
Solution date: 2019-04-23
Public disclosure: 2019-04-30
CVE reference: CVE-2019-11499
CVSS: 7.5 (CVSS3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Vulnerability Details:
Submission-login crashes when authentication is started over TLS secured channel and invalid authentication message is sent. This can lead to denial-of-service attack by persistent attacker(s).

Workaround:
Authentication crash can be avoided if authentication is done without TLS.

Solution:
Operators should upgrade to a fixed version.
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