Mort Bay · Mort Bay Jetty · CVE-2009-4611
**Name of the Vulnerable Software and Affected Versions**
Mort Bay Jetty versions 6.x through 6.1.22
Mort Bay Jetty versions 7.0.0
**Description**
The issue allows remote attackers to potentially modify a window's title, execute arbitrary commands, or overwrite files via an HTTP request containing an escape sequence for a terminal emulator. This is related to the handling of specific parameters and headers, including the `Age` parameter in the Cookie Dump Servlet, the `A` parameter in jsp/expr.jsp, and the `Content-Length` HTTP header.
**Recommendations**
For Mort Bay Jetty versions 6.x through 6.1.22, update to a version later than 6.1.22 to resolve the issue.
For Mort Bay Jetty version 7.0.0, update to a version later than 7.0.0 to resolve the issue.
As a temporary workaround, consider restricting access to the Cookie Dump Servlet and jsp/expr.jsp to minimize the risk of exploitation.
Avoid using the `Age` parameter in the Cookie Dump Servlet and the `A` parameter in jsp/expr.jsp until the issue is resolved.
Restrict the handling of the `Content-Length` HTTP header in arbitrary applications to prevent potential exploitation.