CVE-2023-42818

Public Exploit
SSH public key login without private key challenge if mfa is enabled in jumpserver

Description

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.

Categories

5.4
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.17%
Vendor Advisory github.com
Affected: jumpserver jumpserver
Published at:
Updated at:

References

Link Tags
https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv vendor advisory exploit
https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2

Frequently Asked Questions

What is the severity of CVE-2023-42818?
CVE-2023-42818 has been scored as a medium severity vulnerability.
How to fix CVE-2023-42818?
To fix CVE-2023-42818, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-42818 being actively exploited in the wild?
It is possible that CVE-2023-42818 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-42818?
CVE-2023-42818 affects jumpserver jumpserver.
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