Denial of Service (DoS) Affecting org.eclipse.jetty:jetty-servlets package, versions [10.0.0,10.0.18) [11.0.0,11.0.18)

org.eclipse.jetty:jetty-servlets is an Utility Servlets from Jetty

Affected versions of this package are vulnerable to Denial of Service (DoS) through the PushSessionCacheFilter process. An unauthenticated attacker can exhaust the server's memory by sending multiple requests.

The issue can be avoided by:

1. Not using the PushCacheFilter. Push has been deprecated by the various IETF specs and early hints responses should be used instead;

2. Reducing the idle timeout on unauthenticated sessions will reduce the time such sessions stay in memory;

3. Configure a session cache to use session passivation so that sessions are not stored in memory but rather in a database or file system that may have significantly more capacity than memory.

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

• High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

• Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

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