Cisco Email Security Appliance Content Filter Bypass Vulnerability (cisco-sa-20190703-esa-bypass)

high Nessus Plugin ID 128053

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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 vulnerability in the attachment scanning of Cisco AsyncOS Software due to improper input validation of the email body. An attacker can exploit this vulnerability by naming a malicious attachment with a specific pattern. A successful exploit allows the attacker to bypass configured content filters that would normally block the attachment.

Please see the included Cisco BID and Cisco Security Advisory for more information.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvp88949.

Plugin Details

Severity: High

ID: 128053

File Name: cisco-sa-20190703-esa-bypass.nasl

Version: 1.5

Type: local

Family: CISCO

Published: 8/22/2019

Updated: 12/20/2019

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-2019-1921

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: 7/30/2019

Vulnerability Publication Date: 7/30/2019

Reference Information

CVE: CVE-2019-1921

BID: 109044

CWE: 20

CISCO-SA: cisco-sa-20190703-esa-bypass

CISCO-BUG-ID: CSCvp88949

Detections

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