Kerio Connect < 8.1.0 SSL/TLS Information Disclosure (BEAST)

medium Nessus Plugin ID 72393
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VPR Score: 1.4


The remote mail server is affected by an information disclosure vulnerability.


According to its banner, the remote host is running a version of Kerio Connect (formerly known Kerio MailServer) prior to 8.1.0. It is, therefore, affected by an information disclosure vulnerability, known as BEAST, in the SSL 3.0 and TLS 1.0 protocols due to a flaw in the way the initialization vector (IV) is selected when operating in cipher-block chaining (CBC) modes. A man-in-the-middle attacker can exploit this to obtain plaintext HTTP header data, by using a blockwise chosen-boundary attack (BCBA) on an HTTPS session, in conjunction with JavaScript code that uses the HTML5 WebSocket API, the Java URLConnection API, or the Silverlight WebClient API.

TLS 1.1, TLS 1.2, and all cipher suites that do not use CBC mode are not affected.


Upgrade to Kerio Connect 8.1.0 or later.

See Also

Plugin Details

Severity: Medium

ID: 72393

File Name: kerio_connect_810.nasl

Version: 1.6

Type: remote

Family: Misc.

Published: 2/7/2014

Updated: 7/12/2018

Dependencies: kerio_kms_641.nasl, kerio_mailserver_admin_port.nasl

Risk Information

Risk Factor: Medium

VPR Score: 1.4

CVSS v2.0

Base Score: 4.3

Temporal Score: 3.2

Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:kerio:connect

Required KB Items: kerio/port

Exploit Ease: No known exploits are available

Patch Publication Date: 4/30/2013

Vulnerability Publication Date: 8/31/2011

Reference Information

CVE: CVE-2011-3389

BID: 49778

CERT: 864643