Background-job suppression via MD5 argument collisions
Published Nov 15, 2024 · Updated Nov 15, 2024
Weak hashing in Nextcloud Server 28.0.0 through 28.0.9 and 29.0.0 through 29.0.6 allows attackers to skip background-job queuing. JobList hashed serialized job arguments with MD5 and treated matching argument_hash values in the jobs table as the same job, so a collision suppressed insertion. Exploitation requires low-privileged network access, user interaction, and a chosen MD5 collision; the bounded consequence is failure to schedule the collided job.
Summary
What happened
Weak hashing in Nextcloud Server 28.0.0 through 28.0.9 and 29.0.0 through 29.0.6 allows attackers to skip background-job queuing. JobList hashed serialized job arguments with MD5 and treated matching argument_hash values in the jobs table as the same job, so a collision suppressed insertion. Exploitation requires low-privileged network access, user interaction, and a chosen MD5 collision; the bounded consequence is failure to schedule the collided job.
The record
- CVE
- CVE-2024-52521
- Published
- Nov 15, 2024
- Updated
- Nov 15, 2024
- Vendor
- Nextcloud GmbH
- Product
- Security Advisories
- Classifications
- CWE-328
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 15, 2024CVE publishedPublication date reported by the CVE source.
- Nov 15, 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=>= 28.0.0, < 28.0.10
- Affected versionversion=>= 29.0.0, < 29.0.7
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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