CVE-2018-5389

Published: 6 September 2018

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.

Notes

vulnerability in IKEv1 protocol, not fixable in implementation
use strong passphrase or public-key cryptography

Status

Severity score breakdown

References

• https://www.usenix.org/conference/usenixsecurity18/presentation/felsch
• https://www.usenix.org/system/files/conference/usenixsecurity18/sec18-felsch.pdf
• https://www.usenix.org/sites/default/files/conference/protected-files/security18_slides_felsch.pdf
• https://www.cve.org/CVERecord?id=CVE-2018-5389
• NVD
• Launchpad
• Debian