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Security Bulletin: Vulnerability in Apache MyFaces affects WebSphere Application Server (CVE-2021-26296)

Security Bulletin


Summary

There is a vulnerability in the Apache MyFaces library used by WebSphere Application Server. This has been addressed.

Vulnerability Details

CVEID:   CVE-2021-26296
DESCRIPTION:   Apache MyFaces is vulnerable to cross-site request forgery, caused by improper validation of user-supplied input. By persuading an authenticated user to visit a malicious Web site, a remote attacker could send a malformed HTTP request to perform unauthorized actions. An attacker could exploit this vulnerability to perform cross-site scripting attacks, Web cache poisoning, and other malicious activities.
CVSS Base score: 8.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/197017 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

Affected Products and Versions

Affected Product(s)Version(s)
WebSphere Application Server Liberty17.0.0.3 - 21.0.0.3
WebSphere Application Server9.0
WebSphere Application Server8.5
WebSphere Application Server8.0

Remediation/Fixes

The recommended solution is to apply the interim fix, Fix Pack or PTF containing the APAR for each named product as soon as practical.
    
For WebSphere Application Server Liberty 17.0.0.3 - 21.0.0.3 using the jsf-2.0, jsf-2.2 or jsf-2.3 feature:

· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH34711
--OR--
· Apply Fix Pack 21.0.0.4 or later (targeted availability 2Q2021).


For WebSphere Application Server traditional and WebSphere Application Server Hypervisor Edition:

For V9.0.0.0 through 9.0.5.7:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH34711
--OR--
· Apply Fix Pack 9.0.5.8 or later (targeted availability 2Q2021).  

For V8.5.0.0 through 8.5.5.19:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH34711
--OR--
· Apply Fix Pack 8.5.5.20 or later (targeted availability 3Q2021).

For V8.0.0.0 through 8.0.0.15:
· Upgrade to 8.0.0.15 and then apply Interim Fix PH34711

Additional interim fixes may be available and linked off the interim fix download page.

 WebSphere Application Server V8.0 is no longer in full support; IBM recommends upgrading to a fixed, supported version/release/platform of the product.

Workarounds and Mitigations

For WebSphere Application Server Liberty with features jsf-2.2 and jsf-2.3 and WebSphere Application Server version 9.0 using Java Server Faces (JSF), a workaround can be applied to prevent the vulnerability.

For WebSphere Application Server v9.0, configure the web.xml context parameters "org.apache.myfaces.RANDOM_KEY_IN_VIEW_STATE_SESSION_TOKEN=secureRandom" and "org.apache.myfaces.RANDOM_KEY_IN_CSRF_SESSION_TOKEN=secureRandom".

For WebSphere Application Server Liberty with the jsf-2.2 feature, configure the web.xml context parameters "org.apache.myfaces.RANDOM_KEY_IN_VIEW_STATE_SESSION_TOKEN=secureRandom" and "org.apache.myfaces.RANDOM_KEY_IN_CSRF_SESSION_TOKEN=secureRandom".

For WebSphere Application Server Liberty with the jsf-2.3 feature, configure the web.xml context parameters "org.apache.myfaces.RANDOM_KEY_IN_VIEW_STATE_SESSION_TOKEN=secureRandom", "org.apache.myfaces.RANDOM_KEY_IN_CSRF_SESSION_TOKEN=secureRandom", and "org.apache.myfaces.RANDOM_KEY_IN_WEBSOCKET_SESSION_TOKEN=secureRandom".

There are no local fixes for users of JSF on WebSphere Application Server v8.0, WebSphere Application Server v8.5.5, or WebSphere Application Server Liberty with the jsf-2.0 feature.

Get Notified about Future Security Bulletins

References

Off

Acknowledgement

Change History

08 Apr 2021: Initial Publication
09 Apr 2021: Updated list of Liberty features
12 Apr 2021: Update to add workaround

*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

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

Document Location

Worldwide

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Document Information

Modified date:
12 April 2021

UID

ibm16441433