Credential disclosure via authentication protocol downgrade
Published Jan 14, 2020 · Updated Aug 4, 2024
Authentication downgrade in MikroTik WinBox 3.20 and earlier allows man-in-the-middle attackers to recover a username and password hash. The client falls back from ECSRP-5 to legacy Diffie-Hellman when an intermediary ignores its first negotiation message, then sends the username and an MD5 password hash salted with an attacker-chosen value. The attacker must intercept a legitimate RouterOS login on the network path; the disclosed consequence is credential-material exposure, not configuration change or service interruption.
Summary
What happened
Authentication downgrade in MikroTik WinBox 3.20 and earlier allows man-in-the-middle attackers to recover a username and password hash. The client falls back from ECSRP-5 to legacy Diffie-Hellman when an intermediary ignores its first negotiation message, then sends the username and an MD5 password hash salted with an attacker-chosen value. The attacker must intercept a legitimate RouterOS login on the network path; the disclosed consequence is credential-material exposure, not configuration change or service interruption.
The record
- CVE
- CVE-2019-3981
- Published
- Jan 14, 2020
- Updated
- Aug 4, 2024
- Vendor
- MikroTik
- Product
- WinBox
- Classifications
- CWE-300, T1557
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 14, 2020CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record 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=Winbox 3.20 and below.
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.
Public exploit references
- Tenable WinBox downgrade server proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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