CVE-2024-25175 is a vulnerability identified in Kickdler prior to version 1.107.0 that allows attackers to perform an HTTP response splitting attack leading to cross-site scripting (XSS). HTTP response splitting occurs when an attacker injects CRLF (carriage return and line feed) characters into HTTP headers, causing the server to interpret the input as multiple responses. This can be exploited to inject malicious scripts into the victim's browser context, classified under CWE-79 (Improper Neutralization of Input During Web Page Generation). The vulnerability does not require authentication (PR:N) but does require user interaction (UI:R), such as clicking a crafted link or visiting a malicious page. The CVSS 3.1 base score is 6.1, reflecting a medium severity with network attack vector (AV:N), low attack complexity (AC:L), and partial impact on confidentiality and integrity (C:L/I:L) but no impact on availability (A:N). The vulnerability's scope is changed (S:C), meaning the attack can affect resources beyond the vulnerable component. No known exploits have been reported in the wild, and no official patches have been linked yet, though the issue is reserved and published by MITRE. The root cause is improper sanitization of user input in HTTP headers, allowing attackers to inject CRLF sequences and craft malicious HTTP responses that execute arbitrary scripts in the victim's browser, potentially stealing session tokens or manipulating web content.

The primary impact of CVE-2024-25175 is the potential for attackers to execute arbitrary scripts in the context of a vulnerable web application, leading to partial compromise of user confidentiality and integrity. This can result in session hijacking, theft of sensitive information, or manipulation of displayed content. While availability is not affected, the trustworthiness of the affected web service is undermined. Organizations relying on Kickdler for web services or applications may face reputational damage and user data exposure if exploited. The attack requires user interaction, which may limit widespread automated exploitation but still poses a significant risk through targeted phishing or social engineering. The absence of known exploits suggests a window of opportunity for defenders to patch or mitigate before active exploitation. The scope change indicates that the vulnerability can affect components beyond the immediate vulnerable module, potentially impacting integrated systems or services. Overall, the vulnerability poses a moderate threat to organizations worldwide, especially those with public-facing web applications using vulnerable Kickdler versions.

1. Upgrade Kickdler to version 1.107.0 or later as soon as an official patch is released to address this vulnerability. 2. Until patches are available, implement strict input validation and sanitization on all user-supplied data, especially those incorporated into HTTP headers, to prevent injection of CRLF characters. 3. Employ web application firewalls (WAFs) configured to detect and block HTTP response splitting and XSS attack patterns. 4. Use Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 5. Educate users about the risks of clicking untrusted links and implement anti-phishing measures to reduce the likelihood of successful user interaction exploitation. 6. Monitor web server logs for unusual HTTP header manipulations or suspicious response patterns indicative of response splitting attempts. 7. Conduct regular security assessments and penetration testing focusing on HTTP header injection and XSS vulnerabilities. 8. Isolate vulnerable services behind reverse proxies that can sanitize or validate HTTP responses. These targeted mitigations go beyond generic advice by focusing on HTTP header handling, user interaction risk reduction, and layered defenses.