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CVE-2023-37611

CVE-2023-37611: Neos CMS Cross Site Scripting vulnerability

5.4

CVSS Score
3.1

Basic Information

CVE ID
CVE-2023-37611
GHSA ID
GHSA-6qjf-7g3j-qx25
EPSS Score
0.5031%
CWE
CWE-79
Published
9/19/2023
Updated
1/16/2024
KEV Status
No
Technology
TechnologyPHP

Technical Details

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Package NameEcosystemVulnerable VersionsFirst Patched Version
neos/media-browsercomposer< 7.3.197.3.19
neos/media-browsercomposer>= 8.0.0, < 8.0.168.0.16
neos/media-browsercomposer>= 8.1.0, < 8.1.118.1.11
neos/media-browsercomposer>= 8.2.0, < 8.2.118.2.11
neos/media-browsercomposer>= 8.3.0, < 8.3.98.3.9

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability stemmed from rendering direct links (assetProxy.originalUri) to uploaded SVG files without proper content validation. The pre-patch code in showAction and editAction passed untrusted asset proxies to views that generated <a href> links. The fix introduced a checkForMaliciousContent() method to validate SVGs before allowing original URI links, confirming these controller actions were the vulnerable entry points. The templates' use of assetProxy.originalUri in anchor tags without prior validation created the XSS vector when malicious SVGs were accessed directly.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

*ross Sit* S*riptin* (XSS) vuln*r**ility in N*os *MS *.*.* *llows * r*mot* *ut**nti**t** *tt**k*r to *x**ut* *r*itr*ry *o** vi* * *r**t** SV* *il* uplo**** to t** `n*os/m*n***m*nt/m**i*` *ompon*nt. To m*k* us* o* t*is *tt**k v**tor, t** *tt**k*r must

Reasoning

T** vuln*r**ility st*mm** *rom r*n**rin* *ir**t links (*ss*tProxy.ori*in*lUri) to uplo**** SV* *il*s wit*out prop*r *ont*nt v*li**tion. T** pr*-p*t** *o** in s*ow**tion *n* **it**tion p*ss** untrust** *ss*t proxi*s to vi*ws t**t **n*r*t** <* *r**> li