Authenticated RCE via plaintext update metadata
Published Sep 24, 2021 · Updated Aug 4, 2024
Remote code execution in Concrete CMS 8.5.5 and earlier allows remote authenticated users to execute code through update metadata. The updater retrieves its update JSON scheme over plaintext HTTP and trusts the returned metadata, allowing an attacker-controlled response to redirect the update process. Administrative update privileges and a position permitting outbound HTTP tampering are required; successful exploitation runs code on the CMS host.
Summary
What happened
Remote code execution in Concrete CMS 8.5.5 and earlier allows remote authenticated users to execute code through update metadata. The updater retrieves its update JSON scheme over plaintext HTTP and trusts the returned metadata, allowing an attacker-controlled response to redirect the update process. Administrative update privileges and a position permitting outbound HTTP tampering are required; successful exploitation runs code on the CMS host.
The record
- CVE
- CVE-2021-40099
- Published
- Sep 24, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- T1557
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Sep 24, 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
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo