AngularJS, SVG Sanitization Bypass, CVE-2025-12345 (Low)

How the CVE Works

AngularJS fails to properly sanitize `href` and `xlink:href` attributes within SVG `` elements. Attackers can exploit this by injecting malicious SVG content containing oversized or slow-loading images, bypassing standard image source restrictions. This leads to content spoofing, where attackers manipulate displayed content, and may degrade application performance due to resource exhaustion. Since AngularJS is End-of-Life (EOL), no patches will be released.

DailyCVE Form

Platform: AngularJS
Version: All versions
Vulnerability: SVG sanitization bypass
Severity: Low
Date: Apr 30, 2025

What Undercode Say:

Exploitation:

1. Malicious SVG Injection:


<svg>
<image xlink:href="malicious-resource" width="10000" height="10000"/>
</svg>

2. Performance Degradation:

// Repeatedly inject large SVGs to trigger resource exhaustion
for (let i = 0; i < 1000; i++) {
document.body.innerHTML += <code><svg><image xlink:href="slow-loading-image"/></svg></code>;
}

Mitigation:

1. Disable AngularJS SVG Binding:

angular.module('app').config(function($compileProvider) {
$compileProvider.aHrefSanitizationWhitelist(/^\s(https?|ftp|mailto|tel|local):/);
});

2. Content Security Policy (CSP):

Content-Security-Policy: default-src 'self'; img-src 'self' data:;

3. Manual Sanitization:

function sanitizeSVG(svg) {
return svg.replace(/xlink:href="[^"]"/g, '');
}

Detection:

1. Regex for Vulnerable Patterns:

/<image[^>]+(href|xlink:href)=["'][^"']["']/gi

2. Log Monitoring:

grep -E "xlink:href|svg" /var/log/nginx/access.log

Analytics:

Impact: Low (spoofing, performance disruption)
Exploit Complexity: Low (no authentication required)
Affected Users: Legacy AngularJS applications
Workaround Efficacy: Partial (requires manual fixes)

References:

Sources:

Reported By: github.com
Extra Source Hub:
Undercode

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