#VU8681 Improper certificate validation in Cisco IOS - CVE-2017-12228


Vulnerability identifier: #VU8681

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-12228

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco IOS
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description
The vulnerability allows a remote attacker to conduct man-in-the-middle attack.

The weakness exists due to insufficient certificate validation. A remote attacker can supply a crafted certificate, conduct MiTM attack and decrypt confidential information on user connections to the affected software.


Mitigation
Install update from vendor's website.

Vulnerable software versions

Cisco IOS: 12.4 - 12.4.24 T4, 15.0, 15.1(2.0) - 15.1, 15.2E - 15.2(5c)E, 15.3S - 15.3, 15.4S - 15.4.2 S, 15.5SN - 15.5.3 S2.9


External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-pnp


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.


Latest bulletins with this vulnerability