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Security Bulletin: Multiple vulnerabilities in IBM HTTP Server used by WebSphere Application Server

Security Bulletin


Summary

There are multiple vulnerabilities in the IBM HTTP Server used by WebSphere Application Server. This has been addressed.

Vulnerability Details

CVEID:   CVE-2021-26691
DESCRIPTION:   Apache HTTP Server is vulnerable to a heap-based buffer overflow, caused by improper bounds checking by the mod_session. By sending a specially crafted SessionHeader, a remote attacker could overflow a buffer and cause a denial of service.
CVSS Base score: 5.9
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/203465 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID:   CVE-2021-26690
DESCRIPTION:   Apache HTTP Server is vulnerable to a denial of service, caused by a NULL pointer dereference. A remote attacker could exploit this vulnerability using a specially crafted Cookie header handled by mod_session to cause the system to crash.
CVSS Base score: 3.7
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/203464 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L)

Affected Products and Versions

This vulnerability affects the following version and release of IBM HTTP Server (powered by Apache) component in all editions of WebSphere Application Server and bundling products.

Affected Product(s)Version(s)
IBM HTTP Server9.0

Remediation/Fixes

For IBM HTTP Server used by WebSphere Application Server:

For V9.0.0.0 through 9.0.0.10:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH06010.
--OR--
· Apply Fix Pack 9.0.0.11 or later.

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

Important Note

 IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and
 integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will
 be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential
 risk.

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

References

Off

Acknowledgement

Change History

28 Jun 2021: 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

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

[{"Business Unit":{"code":"BU004","label":"Hybrid Cloud"},"Product":{"code":"SSEQTJ","label":"IBM HTTP Server"},"Component":"","Platform":[{"code":"PF002","label":"AIX"},{"code":"PF010","label":"HP-UX"},{"code":"PF016","label":"Linux"},{"code":"PF027","label":"Solaris"},{"code":"PF033","label":"Windows"},{"code":"PF035","label":"z/OS"}],"Version":"9.0","Edition":"Base,Enterprise,Advanced,Single Server,Network Deployment"}]

Document Information

Modified date:
28 June 2021

UID

ibm16467651