Account takeover via login user enumeration
Published Dec 27, 2021 · Updated Aug 4, 2024
Password-guessing weakness in CSCMS 4.0 through 4.1 allows remote attackers to hijack user accounts through the login box. The login endpoint accepts attempts without a verification code and returns distinct responses for nonexistent usernames and incorrect passwords, enabling account enumeration before repeated password guesses. Unauthenticated network access to the login form is enough to attempt the attack; a successful guess grants access to the victim's CSCMS account.
Summary
What happened
Password-guessing weakness in CSCMS 4.0 through 4.1 allows remote attackers to hijack user accounts through the login box. The login endpoint accepts attempts without a verification code and returns distinct responses for nonexistent usernames and incorrect passwords, enabling account enumeration before repeated password guesses. Unauthenticated network access to the login form is enough to attempt the attack; a successful guess grants access to the victim's CSCMS account.
The record
- CVE
- CVE-2020-21238
- Published
- Dec 27, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- T1110
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 27, 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?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
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
- CSCMS login brute-force demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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