Detections
Analytics

Cisco Email Security Appliance Multiple Vulnerabilities

high Nessus Plugin ID 86914

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Synopsis

The remote security appliance is missing a vendor-supplied security patch.

Description

According to its self-reported version, the Cisco AsyncOS running on the remote Cisco Email Security (ESA) appliance is affected by the following vulnerabilities :

 - An anti-spam bypass vulnerability exists in the anti-spam scanner due to improper handling of malformed packets. An unauthenticated, remote attacker can exploit this, via a crafted DNS Sender Policy Framework (SPF) record, to bypass the scanner. (CVE-2015-4184)

 - A denial of service vulnerability exists in the email filtering feature due to improper input validation of email attachment fields. An unauthenticated, remote attacker can exploit this, via a crafted email with an attachment, to cause memory to be consumed at a high rate, resulting in the filtering process being restarted over again. (CVE-2015-6291)

 - A denial of service vulnerability exists due to improper handling of TCP packets sent at a high rate. An unauthenticated, remote attacker can exploit this to exhaust all available memory, preventing any more TCP connections from being accepted. (CVE-2015-6321)

Solution

Apply the relevant updates referenced in Cisco Security Advisories cisco-sa-20150612-esa, cisco-sa-20151104-esa2, and cisco-sa-20151104-aos.

See Also

http://www.nessus.org/u?fa713eb4

http://www.nessus.org/u?21ab6cfa

http://www.nessus.org/u?561dad7b

Plugin Details

Severity: High

ID: 86914

File Name: cisco-sa-20151104-aos_esa.nasl

Version: 1.11

Type: local

Family: CISCO

Published: 11/18/2015

Updated: 2/28/2020

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.7

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2015-4184

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/h:cisco:email_security_appliance, cpe:/o:cisco:email_security_appliance_firmware

Required KB Items: Host/AsyncOS/Cisco Email Security Appliance/DisplayVersion, Host/AsyncOS/Cisco Email Security Appliance/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 6/12/2015

Vulnerability Publication Date: 6/12/2015

Reference Information

CVE: CVE-2015-4184, CVE-2015-6291, CVE-2015-6321

BID: 75181