Vulnerability identifier: #VU9385

Vulnerability risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-12309

CWE-ID: CWE-113

Exploitation vector: Network

Exploit availability: No

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

Vendor: Cisco Systems, Inc

Description
The vulnerability allows a remote user to perform HTTP response splitting attack.

The weakness exists in the Cisco Email Security Appliance (ESA) due to the failure of the application or its environment to properly sanitize input values. A remote attacker can inject a specially crafted HTTP headers controlling the response body, or splitting the response into multiple responses.

Successful vulnerability may result in cross-site scripting attacks, cross-user defacement, web cache poisoning, and similar exploits.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Cisco Email Security Appliance: 10.0.2 020 - 11.0.0 105

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171115-esa

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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.