CVE-2023-42818 (jumpserver)

JumpServer is an open source bastion host. When users enable MFA and use a public key for authentication, the Koko SSH server does not verify the corresponding SSH private key. An attacker could exploit a vulnerability by utilizing a disclosed public key to attempt brute-force authentication against the SSH service This issue has been patched in versions 3.6.5 and 3.5.6. Users are advised to upgrade. There are no known workarounds for this issue.

attacker authentication bastion brute brute-force cve enable exploit host issue key koko mfa open source private private key public public key server service ssh verify vulnerability