Description
There exists a security vulnerability in Jetty's DosFilter which can be exploited by unauthorized
users to cause remote denial-of-service (DoS) attack on the server using DosFilter. By repeatedly sending crafted requests,
attackers can trigger OutofMemory errors and exhaust the server's memory finally.
Vulnerability details
The Jetty DoSFilter (Denial of Service Filter) is a security filter designed to protect web
applications against certain types of Denial of Service (DoS) attacks and other abusive behavior. It
helps to mitigate excessive resource consumption by limiting the rate at which clients can make
requests to the server. The DoSFilter monitors and tracks client request patterns, including
request rates, and can take actions such as blocking or delaying requests from clients that exceed
predefined thresholds. The internal tracking of requests in DoSFilter is the source of this OutOfMemory
condition.
Impact
Users of the DoSFilter may be subject to DoS attacks that will ultimately exhaust the memory of the server if they have not configured session passivation or an aggressive session inactivation timeout.
Patches
The DoSFilter has been patched in all active releases to no longer support the session tracking mode, even if configured.
Patched releases:
- 9.4.54
- 10.0.18
- 11.0.18
- 12.0.3
Workarounds
The DoSFilter can be configured to not use sessions for tracking usage by setting the trackSessions init parameter to false. This will then use only the IP tracking mechanism, which is not vulnerable.
Sessions can also be configured to have aggressive passivation or inactivation limits.
LianKee Reporter
Description
There exists a security vulnerability in Jetty's DosFilter which can be exploited by unauthorized
users to cause remote denial-of-service (DoS) attack on the server using DosFilter. By repeatedly sending crafted requests,
attackers can trigger OutofMemory errors and exhaust the server's memory finally.
Vulnerability details
The Jetty DoSFilter (Denial of Service Filter) is a security filter designed to protect web
applications against certain types of Denial of Service (DoS) attacks and other abusive behavior. It
helps to mitigate excessive resource consumption by limiting the rate at which clients can make
requests to the server. The DoSFilter monitors and tracks client request patterns, including
request rates, and can take actions such as blocking or delaying requests from clients that exceed
predefined thresholds. The internal tracking of requests in DoSFilter is the source of this OutOfMemory
condition.
Impact
Users of the DoSFilter may be subject to DoS attacks that will ultimately exhaust the memory of the server if they have not configured session passivation or an aggressive session inactivation timeout.
Patches
The
DoSFilterhas been patched in all active releases to no longer support the session tracking mode, even if configured.Patched releases:
Workarounds
The
DoSFiltercan be configured to not use sessions for tracking usage by setting thetrackSessionsinit parameter tofalse. This will then use only the IP tracking mechanism, which is not vulnerable.Sessions can also be configured to have aggressive passivation or inactivation limits.