cms_made_simple: Failure to Sanitize Special Elements into a Different Plane
CVE-2024-27622 is a high-severity failure to sanitize special elements into a different plane vulnerability in cms_made_simple from Cmsmadesimple, with a CVSS 3.1 base score of 7.2 out of 10. It can be exploited remotely over the network by an attacker with administrator privileges, without any action from a user. Affected cms_made_simple versions: 2.2.19; 2.2.21. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 1.98% chance of exploitation within 30 days, higher than 81% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of cms_made_simple you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Cmsmadesimple | cms_made_simple | 2.2.19; 2.2.21 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- HighAdministrator-level access is required first.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. Scored by CISA (ADP).
Official description
A remote code execution vulnerability has been identified in the User Defined Tags module of CMS Made Simple version 2.2.19 / 2.2.21. This vulnerability arises from inadequate sanitization of user-supplied input in the 'Code' section of the module. As a result, authenticated users with administrative privileges can inject and execute arbitrary PHP code.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Failure to Sanitize Special Elements into a Different Plane
The product does not adequately filter user-controlled input for special elements with control implications.
How developers prevent this class of flaw
- Programming languages and supporting technologies might be chosen which are not subject to these issues.
- Utilize an appropriate mix of allowlist and denylist parsing to filter special element syntax from all input.
More Failure to Sanitize Special Elements into a Different Plane vulnerabilities (CWE-75)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Technical write-ups (may include proof of concept)
- github.com/capture0x/CMSMadeSimple/Exploit, Third Party Advisory
- packetstormsecurity.com/files/177241/CMS-Made-Simple-2.2.19-Remote-Code-Execution.htmlExploit, VDB Entry
- vicarius.io/vsociety/posts/pwning-cmsms-via-user-defined-tags-for-fun-and-learning-cve-2024-27622-27623Exploit, Third Party Advisory
Other vulnerabilities in cms_made_simple
- 7.2 High severity
Recent Failure to Sanitize Special Elements into a Different Plane vulnerabilities
- 8.1 High severity
- 9.0 Critical severity
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