Host Header Injection in Web Application

Compliance Impact

This vulnerability involves improper handling of HTTP headers that could lead to manipulated links, limited information disclosure, or compromised integrity of dependent services.

Such issues could potentially increase the risk of phishing attacks or unauthorized information exposure, which may impact compliance with standards like GDPR or HIPAA that require protection of personal and sensitive data.

However, there is no explicit information provided about direct effects on compliance with these regulations.

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Executive Summary

This vulnerability involves improper handling of HTTP headers, specifically allowing a remote attacker to manipulate the value of the Host header by sending specially crafted requests.

Exploiting this flaw could lead to the generation of manipulated links or responses, which might cause limited information disclosure or compromise the integrity of services that depend on these headers.

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Impact Analysis

The vulnerability could allow attackers to manipulate links or redirect users to malicious sites, potentially enabling phishing attacks.

It may also result in limited information disclosure or compromise the integrity of dependent services, which could affect the security and trustworthiness of your systems.

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Mitigation Strategies

To mitigate this vulnerability, users should update the Password Manager application to the latest version released on August 7, 2025, which contains fixes for this and related issues.

Applying this update will address the improper handling of HTTP headers and prevent potential manipulation of links, phishing attacks, or limited information disclosure.

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Detection Guidance

This vulnerability involves improper handling of HTTP Host headers that can be manipulated by specially crafted requests. To detect it on your network or system, you can monitor HTTP traffic for unusual or suspicious Host header values.

One approach is to use network traffic analysis tools or web server logs to identify requests with unexpected or malformed Host headers.

Example commands to help detect such attempts include:

• Using tcpdump to capture HTTP traffic and filter for Host headers: tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep 'Host:'
• Using grep on web server access logs to find suspicious Host header values: grep -i 'Host:' /var/log/httpd/access_log | grep -E '([a-z0-9.-]+\.[a-z]{2,})'
• Using curl to test the server response to manipulated Host headers: curl -H 'Host: malicious.example.com' http://target-server/

Additionally, updating the Password Manager application to the fixed version released on August 7, 2025, is recommended to mitigate this vulnerability.

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