## Summary

There is a denial of service vulnerablility in IBM WebSphere Application Server Liberty used in Liberty for Java for IBM Cloud.

## Vulnerability Details

** CVEID: **[CVE-2020-4590]()
** DESCRIPTION: **IBM WebSphere Application Server Liberty 17.0.0.3 through 20.0.0.9 running oauth-2.0 or openidConnectServer-1.0 server features is vulnerable to a denial of service attack conducted by an authenticated client. IBM X-Force ID: 184650.
CVSS Base score: 5.3
CVSS Temporal Score: See: [ https://exchange.xforce.ibmcloud.com/vulnerabilities/184650]() for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H)

## Affected Products and Versions

Affected Product(s)| Version(s)
—|—
Liberty for Java| 3.48

## Remediation/Fixes

To upgrade to Liberty for Java v3.49-20200918-0244 or higher, you must re-stage or re-push your application

To find the current version of Liberty for Java in IBM Cloud being used, from the command-line Cloud Foundry client by running the following commands:

cf ssh <appname> -c “cat staging_info.yml”

Look for the following lines:

{“detected_buildpack”:”Liberty for Java(TM) (WAR, liberty-20.0.0_9, buildpack-v3.48-20200821-1648, ibmjdk-1.8.0_sr6fp15-20200724, env)”,”start_command”:”.liberty/initial_startup.rb”}

To re-stage your application using the command-line Cloud Foundry client, use the following command:

cf restage <appname>

To re-push your application using the command-line Cloud Foundry client, use the following command:

cf push <appname>

## Workarounds and Mitigations

None

## Get Notified about Future Security Bulletins

Subscribe to [My Notifications]() to be notified of important product support alerts like this.

### References

[Complete CVSS v3 Guide]( “Link resides outside of ibm.com” )
[On-line Calculator v3]( “Link resides outside of ibm.com” )

Off

## Related Information

[IBM Secure Engineering Web Portal]()
[IBM Product Security Incident Response Blog]()

## Change History

06 October 2020: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

## Disclaimer

Review the [IBM security bulletin disclaimer and definitions]() regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

## Document Location

Worldwide

[{“Business Unit”:{“code”:”BU059″,”label”:”IBM Software w/o TPS”},”Product”:{“code”:”SS4JBE”,”label”:”Liberty for Java for IBM Cloud”},”Component”:””,”Platform”:[{“code”:”PF016″,”label”:”Linux”}],”Version”:”All”,”Edition”:””,”Line of Business”:{“code”:”LOB21″,”label”:”Public Cloud Platform”}}]Read More