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Security Bulletin: IBM HTTP Server (powered by Apache) for IBM i is vulnerable to a denial of service attack using HTTP/2 protocol. [CVE-2024-27316]

Security Bulletin


Summary

IBM HTTP Server (powered by Apache) used by IBM i is vulnerable to a denial of service attack due to no limit of continuation fames in HTTP/2 protocol as described in the vulnerability details section. This bulletin identifies the steps to take to address the vulnerability as described in the remediation/fixes section.

Vulnerability Details

CVEID:   CVE-2024-27316
DESCRIPTION:   Apache HTTP Server is vulnerable to a denial of service, caused by the failure to check or limit the use of HTTP/2 CONTINUATION frames that can be sent within a single stream. By sending a stream of CONTINUATION frames that will not be appended to the header list in memory but will still be processed and decoded by the server or will be appended to the header list, a remote attacker could exploit this vulnerability to cause an out of memory (OOM) crash.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/286950 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

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

Remediation/Fixes

The issue can be addressed by applying a PTF to IBM i.  IBM i releases 7.5, 7.4, and 7.3 will be fixed.
 
The IBM i PTF number for 5770-DG1 contains the fix to resolve the vulnerability.

 

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

Acknowledgement

Change History

25 Jun 2024: 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:
25 June 2024

UID

ibm17158582