Vulnerability identifier: #VU12074

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-2018-0243

CWE-ID: CWE-693

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Firepower Management Center
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor: Cisco Systems, Inc

Description
The vulnerability allows a remote unauthenticated attacker to bypass security restrictions on the target system.

The weakness exists in the detection engine due to incorrect detection of an SMB2 or SMB3 file based on the total file length. A remote attacker can send a specially crafted SMB2 or SMB3 transfer request, bypass a configured file action policy that is intended to drop the Server Message Block Version 2 (SMB2) and SMB Version 3 (SMB3) protocols if malware is detected.

Mitigation
Update to versions 6.2.3, 6.2.2.2 or 6.2.0.5.

Vulnerable software versions

Cisco Firepower Management Center: 6.1.0 - 6.2.2.1

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fss

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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.