Non-MFA account takeover via using only SSH public key to login in jumpserver
CVE-2023-43652

9.1CRITICAL

Key Information:

Vendor

Jumpserver

Status
Jumpserver
Vendor
CVE Published:
27 September 2023

What is CVE-2023-43652?

JumpServer, an open-source bastion host, has a vulnerability that allows unauthenticated users to authenticate to its core API using a username and an SSH public key without requiring a password. This flaw arises because the API for KoKo does not validate the source of requests, enabling attackers to generate authentication tokens using just the public key. Since SSH public keys can be easily exposed, an attacker with a compromised key can gain access to user information and perform authorized actions associated with the compromised account. Users are strongly encouraged to upgrade to versions 2.28.20 and 3.7.1 to mitigate this vulnerability, as there are currently no viable workarounds.

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Affected Version(s)

jumpserver >= 2.0.0, < 2.28.20 < 2.0.0, 2.28.20

jumpserver >= 3.0.0, < 3.7.1 < 3.0.0, 3.7.1

References

https://github.com/jumpserver/jumpserver/security/advisor...
x_refsource_CONFIRM
https://www.sonarsource.com/blog/diving-into-jumpserver-a...
x_refsource_MISC

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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