Password brute-force bypass via attacker-controlled IP data
Published Oct 25, 2023 · Updated Mar 25, 2025
Improper trust in client IP data in JumpServer before 3.8.0 allows remote attackers to bypass login brute-force protections. The Core authentication-token endpoint accepts the request-controlled remote_addr field or X-Forwarded-For header as the client identity used by its IP-based attempt counter. No authentication is required, and changing that value between requests permits unlimited password guesses without triggering the IP-based limit.
Summary
What happened
Improper trust in client IP data in JumpServer before 3.8.0 allows remote attackers to bypass login brute-force protections. The Core authentication-token endpoint accepts the request-controlled remote_addr field or X-Forwarded-For header as the client identity used by its IP-based attempt counter. No authentication is required, and changing that value between requests permits unlimited password guesses without triggering the IP-based limit.
The record
- CVE
- CVE-2023-46123
- Published
- Oct 25, 2023
- Updated
- Mar 25, 2025
- Vendor
- JumpServer
- Product
- JumpServer
- Classifications
- CWE-307, CWE-348, T1110.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 25, 2023CVE publishedPublication date reported by the CVE source.
- Mar 25, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <3.8.0
- Affected versionversion=< 3.8.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream curl reproduction for IP-spoofing bypassproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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