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Cisco Email Security Appliance Filter Bypass Vulnerability

high Nessus Plugin ID 129824

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco Email Security Appliance (ESA) is affected by a filter bypass vulnerability in the Sender Policy Framework (SPF) functionality of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) due to insufficiently validating certain incoming SPF messages. An unauthenticated, remote attacker could exploit this, via vulnerability by sending a custom SPF packet, to bypass the configured header filters, which could allow malicious content to pass through the device.

Please see the included Cisco BIDs and Cisco Security Advisory for more information

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvq35034

See Also

http://www.nessus.org/u?fbba4881

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvq35034

Plugin Details

Severity: High

ID: 129824

File Name: cisco-sa-20191002-esa-bypass.nasl

Version: 1.13

Type: local

Family: CISCO

Published: 10/11/2019

Updated: 6/3/2021

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

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-2019-12706

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:H/A:N

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

Vulnerability Information

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/2/2019

Vulnerability Publication Date: 10/2/2019

Reference Information

CVE: CVE-2019-12706

CWE: 20

CISCO-SA: cisco-sa-20191002-esa-bypass

IAVA: 2019-A-0368-S

CISCO-BUG-ID: CSCvq35034