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Security Bulletin: IBM HTTP Server (powered by Apache) for IBM i is vulnerable to HTTP response splitting and denial of service attacks (CVE-2022-37436, CVE-2006-20001)

Security Bulletin


Summary

IBM HTTP Server (powered by Apache) for IBM i is vulnerable to HTTP response splitting attacks due to a use of malicious backend and a denial of service attack due to an out-of-bounds read or write as described in the vulnerability details section. IBM i has addressed the CVEs by providing fixes to the Apache HTTP Server implementation as described in the Remediation/Fixes section.

Vulnerability Details

CVEID:   CVE-2022-37436
DESCRIPTION:   Apache HTTP Server is vulnerable to HTTP response splitting attacks, caused by the use of a malicious backend by mod_proxy. A remote attacker could exploit this vulnerability to inject arbitrary HTTP headers and cause the server to return a split response, once the URL is clicked. This would allow the attacker to perform further attacks, such as Web cache poisoning or cross-site scripting, and possibly obtain sensitive information.
CVSS Base score: 6.1
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/244885 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)

CVEID:   CVE-2006-20001
DESCRIPTION:   Apache HTTP Server is vulnerable to a denial of service, caused by an out-of-bounds read or write of zero in mod_dav. By sending a specially crafted If: request header, an attacker could exploit this vulnerability to cause the process to crash.
CVSS Base score: 5.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/244883 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

Affected Products and Versions

Affected Product(s)Version(s)
IBM i7.5
IBM i7.4
IBM i7.3
IBM i7.2

Remediation/Fixes

The issue can be fixed by applying a PTF to IBM i.  IBM i releases 7.5, 7.4, 7.3, and 7.2 will be fixed.
 
The IBM i PTF numbers contain the fix for the vulnerabilities.
IBM i Release5770-DG1
PTF Number
PTF Download Link
7.5SI82700
SI82701
https://www.ibm.com/support/pages/ptf/SI82700
https://www.ibm.com/support/pages/ptf/SI82701
7.4SI82702
SI82703
https://www.ibm.com/support/pages/ptf/SI82702
https://www.ibm.com/support/pages/ptf/SI82703
7.3SI82704
SI82705
https://www.ibm.com/support/pages/ptf/SI82704
https://www.ibm.com/support/pages/ptf/SI82705
7.2SI82706
SI82707
https://www.ibm.com/support/pages/ptf/SI82706
https://www.ibm.com/support/pages/ptf/SI82707
 

https://www.ibm.com/support/fixcentral

Important note: IBM recommends that all users running unsupported versions of affected products upgrade to supported and fixed version of affected products.

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

References

Off

Change History

19 Apr 2023: 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:
19 April 2023

UID

ibm16984745