Security restrictions bypass in Cisco Firepower Management Center

1) Security restrictions bypass

EUVDB-ID: #VU7678

Risk: Low

CVSSv4.0: 2.7 [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-2017-6766

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The weakness exists in the Secure Sockets Layer (SSL) Decryption and Inspection feature of Cisco Firepower System Software due to unexpected interaction with Known Key and Decrypt and Resign configuration settings of SSL policies. A remote attacker can send a specially crafted SSL packet through an affected device in a valid SSL session and bypass the SSL decryption and inspection policy.

Mitigation

The vulnerability is fixed in version 6.1.0.5.

Vulnerable software versions

Cisco Secure Firewall Management Center (formerly Firepower Management Center, FMC): 5.4.0 - 6.2.2

CPE2.3

• cpe:2.3:a:cisco_systems:cisco_firepower_management_center:5.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_firepower_management_center:5.4.1:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_firepower_management_center:6.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_firepower_management_center:6.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_firepower_management_center:6.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_firepower_management_center:6.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_firepower_management_center:6.2.2:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170802-fpw

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.