Security restrictions bypass in Cisco ASA 5500-X Series

1) Security restrictions bypass

EUVDB-ID: #VU7645

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-6770

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions.

The weakness exists in the Open Shortest Path First (OSPF) Routing Protocol Link State Advertisement (LSA) database due to improper input validation. A remote attacker can send specially crafted unicast or multicast OSPF LSA type 1 packets and take full control of the OSPF Autonomous System (AS) domain routing table, allowing the attacker to intercept or black-hole traffic.

Mitigation

The vulnerability is addressed in the following versions: 201.1(11.1), 201.1(10.4), 201.1(1.30), 101.1(10.5), 101.1(1.41), 100.13(0.167), 100.11(0.84), 99.1(20.80), 98.1(18.24), 98.1(12.151), 97.1(0.163), 96.2(0.148), 9.8(1.202), 9.8(1.64), 9.8(1.6), 9.6(3.10).

Vulnerable software versions

Cisco ASA 5500-X Series: 9.2

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170727-ospf

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.