CVE-2021-37627
Privilege escalation via form generator
Public exploit available. Not confirmed exploited in the wild yet. Fixed in 4.4.56.
What to do
Find your product and version, then upgrade to the build on the right.
- ContaoAffected: < 4.4.56Upgrade to: not statedAffected: >= 4.5.0, < 4.9.18Upgrade to: not statedAffected: >= 4.10.0, < 4.11.7Upgrade to: not statedStated by: CVE record
- Packagist contao/core-bundleAffected: ≥ 4.0.0, < 4.4.56Upgrade to: 4.4.56Stated by: GitHub advisory
- Packagist contao/contaoAffected: ≥ 4.0.0, < 4.4.56Upgrade to: 4.4.56Stated by: GitHub advisory
Versions as the sources state them. Full version matrix after sign-in
What it is
From the CVE record
Contao is an open source CMS that allows creation of websites and scalable web applications. In affected versions it is possible to gain privileged rights in the Contao back end. Installations are only affected if they have untrusted back end users who have access to the form generator. All users are advised to update to Contao 4.4.56, 4.9.18 or 4.11.7. As a workaround users may disable the form generator or disable the login for untrusted back end users.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
2 sources with a proof of concept or module.
Exploit links, PoCs and Metasploit modules after sign-in- EPSS
1.0% chance of exploitation activity in the next 30 days, which ranks it in the 63rd percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
The patch came 471 days before any public exploit.
- Public exploit / PoCsource: github-poc
- Patch availablerecord updated
- Publishedweakness classified, att&ck mapped
Affected products
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Scored 8.0 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
- Privileges Required HighRequires admin or elevated privileges
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope ChangedThe exploit can affect other components (e.g. sandbox escape, host compromise from VM)
Impact if exploited
- Confidentiality HighTotal information disclosure — all data in the component is compromised
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability HighTotal denial of service — the component is completely unavailable
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
- Privilege EscalationT1068Exploitation for Privilege Escalationhigh confidence
Sources
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We'll flag the next CVE, public exploit or patch for Contao/core-bundle, not every advisory. This one: public exploit.
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