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CVE-2018-5389

5.9 · MEDIUM

The Internet Key Exchange v1 main mode is vulnerable to offline dictionary or brute force attacks.

Published Sep 6, 2018CWE-521EPSS 3.04%

Overview

CVE-2018-5389 is a medium-severity vulnerability. It was published on September 6, 2018 and has a CVSS 3.0 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refblogs.cisco.com/security/great-cipher-but-where-did-you-get-that-keyRefmy.f5.com/manage/s/article/K42378447Refweb-in-security.blogspot.com/2018/08/practical-dictionary-attack-on-ipsec-ike.htmlRefwww.kb.cert.org/vuls/id/857035Refwww.usenix.org/system/files/conference/usenixsecurity18/sec18-felsch.pdfRefblogs.cisco.com/security/great-cipher-but-where-did-you-get-that-keyRefmy.f5.com/manage/s/article/K42378447Refweb-in-security.blogspot.com/2018/08/practical-dictionary-attack-on-ipsec-ike.htmlRefwww.kb.cert.org/vuls/id/857035Refwww.usenix.org/system/files/conference/usenixsecurity18/sec18-felsch.pdf

How CyberStrike helps

Frequently asked questions

What is CVE-2018-5389?

CVE-2018-5389 is a medium-severity vulnerability. It was published on September 6, 2018 and has a CVSS 3.0 base score of 5.9 (MEDIUM).

How severe is CVE-2018-5389?

This vulnerability has a CVSS 3.0 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-5389?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-5389?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-5389 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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