Account takeover via predictable password-reset tokens
Published Mar 3, 2021 · Updated Aug 4, 2024
Authentication bypass in Epignosis eFront LMS 5.2.17 and 5.2.21 allows remote attackers to reset any account password via a crafted token. The reset-token hash uses MD5 over an attacker-set reset timestamp and the target login name, making its inputs predictable; sequential user IDs can also be enumerated without lockout. No authentication or user interaction is required, and successful exploitation permits account takeover at the target account's privilege level.
Summary
What happened
Authentication bypass in Epignosis eFront LMS 5.2.17 and 5.2.21 allows remote attackers to reset any account password via a crafted token. The reset-token hash uses MD5 over an attacker-set reset timestamp and the target login name, making its inputs predictable; sequential user IDs can also be enumerated without lockout. No authentication or user interaction is required, and successful exploitation permits account takeover at the target account's privilege level.
The record
- CVE
- CVE-2020-28597
- Published
- Mar 3, 2021
- Updated
- Aug 4, 2024
- Vendor
- Epignosis
- Product
- eFront LMS
- Classifications
- CWE-335, CWE-337, T1098
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 3, 2021CVE 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=Epignosis eFront LMS 5.2.17, Epignosis eFront LMS 5.2.21
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
- Talos password-reset token calculation procedureproof 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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