CISA has lately expanded its Recognized Exploited Vulnerabilities (KEV) Catalog to incorporate a big safety flaw affecting the MDaemon E mail Server, tracked as CVE-2024-11182.
This vulnerability, categorized beneath CWE-79 (Improper Neutralization of Enter Throughout Net Web page Technology, generally often called Cross-Website Scripting or XSS), permits distant attackers to execute arbitrary JavaScript code within the context of a consumer’s browser through a specifically crafted HTML e-mail.
The addition of this vulnerability to the KEV Catalog underscores its energetic exploitation threat and the pressing want for organizations to use mitigations or discontinue use if patches are unavailable.
As federal companies and enterprises alike depend on the KEV Catalog for vulnerability prioritization, the inclusion of CVE-2024-11182 highlights the evolving risk panorama dealing with e-mail infrastructure at the moment.
Understanding CVE-2024-11182 and XSS in MDaemon
CVE-2024-11182 is a cross-site scripting (XSS) vulnerability recognized in MDaemon E mail Server variations previous to 24.5.1c.
The flaw arises from inadequate sanitization of HTML content material in e-mail messages processed by the server’s webmail interface. Particularly, attackers can embed malicious JavaScript inside the img tag of an HTML e-mail.
When a consumer accesses the malicious e-mail by way of the webmail shopper, the injected script executes inside the browser, inheriting the privileges and session of the sufferer consumer.
This kind of vulnerability falls beneath CWE-79, a well known class of safety points the place user-supplied enter shouldn’t be correctly neutralized earlier than being included in net web page output.
The technical mechanism of this assault leverages the browser’s dealing with of HTML and JavaScript, exploiting the belief relationship between the webmail utility and the consumer’s browser session.
By injecting JavaScript, an attacker can carry out actions equivalent to stealing session cookies, redirecting customers to malicious websites, or performing actions on behalf of the consumer with out their consent.
The inclusion of CVE-2024-11182 within the CISA KEV Catalog is a direct response to proof of energetic exploitation within the wild.
The KEV Catalog, maintained by CISA, serves as an authoritative repository of vulnerabilities which have been exploited in opposition to private and non-private organizations.
Its objective is to information federal companies and, by extension, the broader cybersecurity neighborhood in prioritizing the remediation of high-risk vulnerabilities.
Danger FactorsDetailsAffected ProductsMDaemon E mail Server <24.5.1c ImpactArbitrary JavaScript execution through webmail interface, enabling session hijacking, credential theft, or unauthorized actionsExploit Prerequisites1. Attacker sends crafted HTML e-mail 2. Sufferer views e-mail through a webmail clientCVSS 3.1 Score6.1 (Medium)
Mitigation
In response to the disclosure of CVE-2024-11182, MDaemon Applied sciences has launched an replace addressing the XSS vulnerability in variations 24.5.1c and later.
Organizations operating affected variations are strongly suggested to use the vendor-provided patch instantly to mitigate the danger of exploitation.
If patching shouldn’t be possible, CISA recommends following mitigation steering, together with disabling weak providers or discontinuing use of the product till a repair is on the market.
Moreover, safety groups are inspired to assessment and improve e-mail filtering and sanitization mechanisms, conduct common vulnerability scans, and educate customers concerning the dangers of interacting with suspicious emails.
For environments the place patching is delayed, implementing net utility firewalls (WAFs) or e-mail safety gateways able to filtering malicious HTML and JavaScript content material can present an interim layer of protection.
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