CISCO : Cisco Email Security Appliance Email Scanner Denial of Service Vulnerability

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Test ID: 1.3.6.1.4.1.25623.1.0.105445

Category: CISCO

Title: Cisco Email Security Appliance Email Scanner Denial of Service Vulnerability

Summary: A vulnerability in the email message filtering feature of Cisco AsyncOS for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause an ESA device to become unavailable due to a denial of service (DoS) condition.

Description: Summary:
A vulnerability in the email message filtering feature of Cisco AsyncOS for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause an ESA device to become unavailable due to a denial of service (DoS) condition.

Vulnerability Insight:
The vulnerability is due to improper input validation when an email attachment contains corrupted fields and is filtered by the ESA. An attacker could exploit this vulnerability by sending a crafted email with an attachment to the ESA. A successful exploit could allow the attacker to cause a DoS condition. While the attachment is being filtered, memory is consumed at at high rate until the filtering process restarts. When the process restarts, it will resume processing the same malformed attachment and the DoS condition will continue.
Cisco has released software updates that address this vulnerability. There are no workarounds that mitigate this vulnerability.

Affected Software/OS:
See Vendor advisory.

Solution:
See Vendor advisory.

CVSS Score:
7.8

CVSS Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:C

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2015-6291
Cisco Security Advisory: 20151104 Cisco Email Security Appliance Email Scanner Denial of Service Vulnerability
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151104-esa2
http://www.securitytracker.com/id/1034064

Copyright This script is Copyright (C) 2015 Greenbone Networks GmbH

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Test ID:	1.3.6.1.4.1.25623.1.0.105445
Category:	CISCO
Title:	Cisco Email Security Appliance Email Scanner Denial of Service Vulnerability
Summary:	A vulnerability in the email message filtering feature of Cisco AsyncOS for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause an ESA device to become unavailable due to a denial of service (DoS) condition.
Description:	Summary: A vulnerability in the email message filtering feature of Cisco AsyncOS for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause an ESA device to become unavailable due to a denial of service (DoS) condition. Vulnerability Insight: The vulnerability is due to improper input validation when an email attachment contains corrupted fields and is filtered by the ESA. An attacker could exploit this vulnerability by sending a crafted email with an attachment to the ESA. A successful exploit could allow the attacker to cause a DoS condition. While the attachment is being filtered, memory is consumed at at high rate until the filtering process restarts. When the process restarts, it will resume processing the same malformed attachment and the DoS condition will continue. Cisco has released software updates that address this vulnerability. There are no workarounds that mitigate this vulnerability. Affected Software/OS: See Vendor advisory. Solution: See Vendor advisory. CVSS Score: 7.8 CVSS Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2015-6291 Cisco Security Advisory: 20151104 Cisco Email Security Appliance Email Scanner Denial of Service Vulnerability http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151104-esa2 http://www.securitytracker.com/id/1034064
Copyright	This script is Copyright (C) 2015 Greenbone Networks GmbH