{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2018-25309/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":7.2,"id":"CVE-2018-25309"}],"_cs_exploited":false,"_cs_products":["Recent threads 17.0"],"_cs_severities":["medium"],"_cs_tags":["xss","cve-2018-25309","web-application"],"_cs_type":"advisory","_cs_vendors":["MyBB"],"content_html":"\u003cp\u003eMyBB Recent Threads 17.0 is vulnerable to a persistent cross-site scripting (XSS) vulnerability, identified as CVE-2018-25309. This vulnerability allows attackers to inject malicious JavaScript code into the subject lines of forum threads. When other users view the index page or any page displaying the affected thread titles, the injected script executes within their browsers. This can lead to session hijacking, defacement, or other malicious actions. The vulnerability was reported in 2018 but remains relevant for older MyBB installations that have not been patched or upgraded. The attacker exploits a lack of proper input sanitization in the thread creation process.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker crafts a malicious thread subject containing JavaScript code (e.g., \u003ccode\u003e\u0026lt;script\u0026gt;alert(\u0026quot;XSS\u0026quot;)\u0026lt;/script\u0026gt;\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eAttacker submits the crafted thread subject when creating a new thread on the MyBB forum.\u003c/li\u003e\n\u003cli\u003eThe MyBB application stores the malicious subject in the database without proper sanitization.\u003c/li\u003e\n\u003cli\u003eA user visits the forum\u0026rsquo;s index page or any page that displays the thread\u0026rsquo;s subject.\u003c/li\u003e\n\u003cli\u003eThe MyBB application retrieves the thread subject from the database and injects it into the HTML of the page.\u003c/li\u003e\n\u003cli\u003eThe user\u0026rsquo;s browser parses the HTML and executes the injected JavaScript code.\u003c/li\u003e\n\u003cli\u003eThe attacker\u0026rsquo;s JavaScript code performs malicious actions, such as stealing cookies or redirecting the user to a malicious website.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this XSS vulnerability can lead to various impacts, including session hijacking, where an attacker steals a user\u0026rsquo;s session cookie and gains unauthorized access to their account. Website defacement is also possible, where the attacker alters the appearance of the forum. In a targeted attack, the attacker could potentially gain control over the MyBB server itself, depending on the permissions of the user whose session is hijacked and the server configuration. Given the popularity of MyBB, a successful exploit could affect numerous forums and their users.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetect MyBB XSS via Thread Title\u003c/code\u003e to identify potential exploitation attempts by detecting script tags in HTTP request parameters to thread creation endpoints.\u003c/li\u003e\n\u003cli\u003eInspect web server logs for HTTP requests containing \u003ccode\u003e\u0026lt;script\u0026gt;\u003c/code\u003e tags in the \u003ccode\u003esubject\u003c/code\u003e parameter when creating a new thread, as this is indicative of a potential XSS attack (see references for vulnerable parameter).\u003c/li\u003e\n\u003cli\u003eUpgrade MyBB installations to a patched version that includes proper input sanitization to prevent XSS vulnerabilities.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-02T12:00:00Z","date_published":"2024-01-02T12:00:00Z","id":"/briefs/2024-01-mybb-xss/","summary":"MyBB Recent threads 17.0 contains a persistent cross-site scripting vulnerability (CVE-2018-25309) that allows attackers to inject malicious scripts by creating threads with crafted subject lines, leading to arbitrary JavaScript execution in the browsers of users viewing the index page.","title":"MyBB Recent Threads 17.0 Persistent Cross-Site Scripting Vulnerability (CVE-2018-25309)","url":"https://feed.craftedsignal.io/briefs/2024-01-mybb-xss/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2018-25309","version":"https://jsonfeed.org/version/1.1"}