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

Security Bulletin


Summary

There are multiple vulnerabilities in the IBM HTTP Server used by IBM WebSphere Application Server. This has been addressed. IBM HTTP Server is affected by CVE-2021-44224 for IBM HTTP Server configurations with "ProxyRequests ON" in the IBM HTTP Server configuration file (httpd.conf by default). IBM HTTP Server is affected by CVE-2021-44790 for IBM HTTP Server configurations with "LoadModule lua_module/mod_lua.so" appearing in the IBM HTTP Server configuration file (httpd.conf by default) where a customer-provided Lua script uses the "r:parsebody" function.

Vulnerability Details

CVEID:   CVE-2021-44224
DESCRIPTION:   Apache HTTP Server is vulnerable to a denial of service or server-side request forgery. By sending a specially crafted URI to httpd configured as a forward proxy, an attacker could exploit this vulnerability to cause a NULL pointer dereference. By sending a specially crafted URI to configurations mixing forward and reverse proxy declarations, an attacker could allow for requests to be directed to a declared Unix Domain Socket endpoint.
CVSS Base score: 8.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/215719 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H)

CVEID:   CVE-2021-44790
DESCRIPTION:   Apache HTTP Server is vulnerable to a buffer overflow, caused by improper bounds checking in the mod_lua multipart parser called from Lua scripts). By sending a specially crafted request, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash.
CVSS Base score: 9.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/215686 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

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

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

Remediation/Fixes

IBM strongly recommends addressing this vulnerability now by applying the interim fix or Fix Pack linked below containing APAR PH42862 for each named product.

For IBM HTTP Server used by IBM WebSphere Application Server:

For V9.0.0.0 through 9.0.5.10:

IBM strongly recommends addressing this vulnerability now by applying the interim fix or Fix Pack linked below containing APAR PH42862 for each named product.

· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH42862
--OR--
· Apply Fix Pack 9.0.5.11 or later (targeted availability 1Q2022). 

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

Mitigations for this issue are available. If the interim fixes in PH42862 cannot be applied immediately, then follow the temporary mitigation steps as documented in Interim Fix PH42862.

Get Notified about Future Security Bulletins

References

Off

Change History

12 Jan 2022: 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. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location

Worldwide

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Document Information

Modified date:
12 January 2022

UID

ibm16540288