Password-hash disclosure via cleartext UMAS project transfers
Published Nov 13, 2024 · Updated Nov 13, 2024
Cleartext credential exposure in Schneider Electric Modicon controllers allows attackers to capture project password hashes. UMAS project upload and download messages transfer the full APX binary without encryption, exposing its Base64-encoded password hash and salt. A passive position inside the logical network and a concurrent legitimate project transfer are required; the recovered values enable offline cracking or pass-the-hash access to a reserved controller session.
Summary
What happened
Cleartext credential exposure in Schneider Electric Modicon controllers allows attackers to capture project password hashes. UMAS project upload and download messages transfer the full APX binary without encryption, exposing its Base64-encoded password hash and salt. A passive position inside the logical network and a concurrent legitimate project transfer are required; the recovered values enable offline cracking or pass-the-hash access to a reserved controller session.
The record
- CVE
- CVE-2024-8933
- Published
- Nov 13, 2024
- Updated
- Nov 13, 2024
- Vendor
- Distributed Data Systems
- Product
- Modicon Momentum Unity M1E Processor
- Classifications
- CWE-924, T0842
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 13, 2024CVE publishedPublication date reported by the CVE source.
- Nov 13, 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?
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- Affected versionversion=0 <*
- Affected versionversion=All Versions
What conditions does exploitation require?
What is affected?
Published CVSS scores
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
- UMAS password-hash capture and pass-the-hash demonstrationfunctional · demonstrated
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Technologies
Your stack
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Your stack
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