CVE-2018-5389 Information

Description

The Internet Key Exchange v1 main mode is vulnerable to offline dictionary or brute force attacks. Reusing a key pair across different versions and modes of IKE could lead to cross-protocol authentication bypasses. It is well known that the aggressive mode of IKEv1 PSK is vulnerable to offline dictionary or brute force attacks. For the main mode however only an online attack against PSK authentication was thought to be feasible. This vulnerability could allow an attacker to recover a weak Pre-Shared Key or enable the impersonation of a victim host or network.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

https://blogs.cisco.com/security/great-cipher-but-where-did-you-get-that-key https://web-in-security.blogspot.com/2018/08/practical-dictionary-attack-on-ipsec-ike.html https://www.kb.cert.org/vuls/id/857035 https://www.usenix.org/system/files/conference/usenixsecurity18/sec18-felsch.pdf

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.9