Information disclosure when handling IKEv1 packets in Cisco products

1) Information disclosure

EUVDB-ID: #VU532

Risk: High

CVSSv4.0: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2016-6415

CWE-ID: CWE-200 - Information exposure

Exploit availability: Yes

Description

The vulnerability allows a remote user to access potentially sensitive information on the target system.

The weakness exists due to insufficient checks of IKE packats when handling ISAKMP requests. By sending specially crafted IKEv1 packets  to the IKE service via IPv4 or IPv6 a malicious user can obtain memory contents.

Successful exploitation of the vulnerability leads to confidential information disclosure on the vulnerable system.

Note: this vulnerability was being actively exploited in the wild. It was disclosed as part of Equation Group Leak and is reffered as BENIGNCERTAIN exploit.

Mitigation

Update to version 5.3.x.

Vulnerable software versions

Cisco IOS: 12.0 - 15.2(4)ea

Cisco IOS XR: 5.1.0 - 6.0.1

Cisco IOS XE: 3.15S - 3.17S

CPE2.3

• cpe:2.3::::12.0:*:*:*:*:*:*:*
• cpe:2.3::::12.1:*:*:*:*:*:*:*
• cpe:2.3::::12.2.33:*:*:*:*:*:*:*
• cpe:2.3::::12.3:*:*:*:*:*:*:*
• cpe:2.3::::12.4:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios:15.2(4)ea:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios_xr:5.1.3:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios_xr:5.2.4:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios_xr:5.3.3:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios_xr:6.0.1:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios_xe:3.15S:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160916-ikev1

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?

Yes. This vulnerability is being exploited in the wild.