Plattform
ruby
Komponente
thin
Behoben in
1.2.4
CVE-2009-3287 describes an IP address spoofing vulnerability in the Thin web server. This flaw allows attackers to manipulate the X-Forwarded-For header, leading to inaccurate client IP address identification and potentially enabling malicious actors to hide their activities. The vulnerability affects versions of Thin up to and including 1.2.3, and a fix is available in version 1.2.4.
An attacker can leverage CVE-2009-3287 to manipulate the X-Forwarded-For header, effectively impersonating a different client. This allows them to mask their origin and potentially bypass access controls or logging mechanisms that rely on IP address verification. For example, an attacker could spoof the IP address of a trusted internal user to gain unauthorized access to resources. The blast radius extends to any system or service that relies on the Thin web server for handling client requests and using the X-Forwarded-For header for authentication or authorization. This vulnerability highlights the importance of proper input validation and secure handling of HTTP headers.
CVE-2009-3287 was publicly disclosed in 2017, though the vulnerability itself dates back to 2009. There is no indication of it being actively exploited in the wild, nor is it listed on the CISA KEV catalog. Public proof-of-concept exploits are available, demonstrating the ease of exploitation. The vulnerability's age and the availability of a patch suggest that many systems are already protected, but legacy deployments may still be at risk.
Organizations using Thin web server as a reverse proxy or load balancer, particularly those with legacy configurations that heavily rely on IP address-based access controls, are at risk. Shared hosting environments where multiple users share the same server and IP address are also vulnerable.
• ruby / server:
grep -r 'X-Forwarded-For' /opt/thin/config/*.rb | grep 'request.env["HTTP_X_FORWARDED_FOR"]='• generic web:
curl -I <target_url> | grep X-Forwarded-Fordiscovery
disclosure
patch
Exploit-Status
EPSS
0.48% (65% Perzentil)
The primary mitigation for CVE-2009-3287 is to upgrade to Thin web server version 1.2.4 or later, which includes the fix. If upgrading is not immediately feasible, consider implementing a Web Application Firewall (WAF) or reverse proxy to filter and sanitize the X-Forwarded-For header. Configure the WAF to reject or modify requests with suspicious or unexpected values in the X-Forwarded-For header. Additionally, review and strengthen any authentication or authorization mechanisms that rely on the client's IP address. After upgrading, confirm the fix by sending a request with a modified X-Forwarded-For header and verifying that the server does not accept the spoofed IP address.
Kein offizieller Patch verfügbar. Prüfe auf Workarounds oder überwache auf Updates.
Schwachstellenanalysen und kritische Warnungen direkt in deinen Posteingang.
CVE-2009-3287 is a vulnerability in Thin web server versions up to 1.2.3 that allows attackers to spoof client IP addresses by manipulating the X-Forwarded-For header, potentially hiding malicious activity.
You are affected if you are running Thin web server version 1.2.3 or earlier. Upgrade to version 1.2.4 to mitigate the risk.
The recommended fix is to upgrade to version 1.2.4 of the Thin web server. If upgrading is not possible, implement a WAF with X-Forwarded-For header validation.
While no active campaigns are currently known, the vulnerability's simplicity makes it a potential target. Public proof-of-concept exploits exist.
Refer to the original advisory and related discussions on security mailing lists and vulnerability databases for details.
Lade deine Abhängigkeitsdatei hoch und erfahre sofort, ob dich diese und andere CVEs treffen.
Lade deine Gemfile.lock-Datei hoch und wir sagen dir sofort, ob du betroffen bist.