#VU1088 Security restrictions bypass in Cisco Web Security Appliance and Cisco Email Security Appliance - CVE-2016-1480

Vulnerability identifier: #VU1088

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-1480

CWE-ID: CWE-388

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Web Security Appliance
Server applications / IDS/IPS systems, Firewalls and proxy servers
Cisco Email Security Appliance
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Cisco Systems, Inc

Description
The vulnerability allows a remote unauthenticated user to bypass security restrictions on the target system.
The weakness exists due to improper error handling. By sending an email message with a specially crafted MIME attachment, a remote attacker can bypass the configured user filters.
Successful exploitation of the vulnerability allows a malicious user to gain access to the vulnerable system.

Mitigation
Update to version 9.1.1-038, 9.7.1-066.

Vulnerable software versions

Cisco Web Security Appliance: 9.5.0 444

Cisco Email Security Appliance: 8.0.0 000 - 9.6.0 042

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External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161026-esawsa1

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.