Critical severity · published Sep 27, 2023
CVE-2023-42818
SSH public key login without private key challenge if mfa is enabled in jumpserver
9.8
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JU
jumpserver · jumpserver
>= 3.6.0, < 3.6.5; < 3.5.6 · source: vendor, NVD, CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-42818
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-42818
Exploit
https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv
www.sonarsource.com
https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2
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