#VU6999 Security bypass in Cisco Email Security Appliance - CVE-2017-6671
Published: June 9, 2017 / Updated: June 9, 2017
Vulnerability identifier: #VU6999
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2017-6671
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Cisco Email Security Appliance
Cisco Email Security Appliance
Software vendor:
Cisco Systems, Inc
Cisco Systems, Inc
Description
The vulnerability allows remote unauthenticated attacker to bypass configured filters on the device.
The weakness exists in the email message scanning of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) due to improper input validation of an email with an attachment and modified Multipurpose Internet Mail Extensions (MIME) header. A remote attacker can send a malformed email message with an attachment to bypass configured message filters.
The weakness exists in the email message scanning of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) due to improper input validation of an email with an attachment and modified Multipurpose Internet Mail Extensions (MIME) header. A remote attacker can send a malformed email message with an attachment to bypass configured message filters.
Remediation
Update to version 9.8.1-015 or 10.0.2-020.