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Security Bulletin: Multiple vulnerabilities in Apache HTTP Server affect IBM i

Security Bulletin


Summary

Apache HTTP Server is supported on IBM i. IBM i has addressed the applicable CVEs.

Vulnerability Details

CVEID:   CVE-2020-9490
DESCRIPTION:   Apache HTTP Server is vulnerable to a denial of service, caused by a flaw when the server tries to HTTP/2 PUSH a resource afterwards. By using a specially-crafted value for the "Cache-Digest" header, a remote attacker could exploit this vulnerability to cause the application to crash.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/186404 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)

CVEID:   CVE-2020-11993
DESCRIPTION:   Apache HTTP Server is vulnerable to a denial of service, caused by a flaw when trace/debug enabled for the HTTP/2 module and on certain traffic edge patterns. By sending a specially-crafted HTTP/2 Header, a remote attacker could exploit this vulnerability to cause the application to crash.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/186405 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)

CVEID:   CVE-2020-11985
DESCRIPTION:   Apache HTTP Server could allow a remote attacker to conduct spoofing attacks, caused by a flaw when using proxying with mod_remoteip and certain mod_rewrite rules. By sending a specially-crafted request, an attacker could exploit this vulnerability to spoof IP address for logging and PHP scripts. Note: This vulnerability was fixed in Apache HTTP Server 2.4.24 but was retrospectively allocated a low severity CVE in 2020.
CVSS Base score: 5.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/186403 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)

Affected Products and Versions

 

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

 

 

Remediation/Fixes

The issue can be fixed by applying a PTF to IBM i.
Releases 7.4, 7.3, and 7.2 of IBM i are supported and will be fixed.

The IBM i PTF numbers containing the fix for the CVEs follow.  Future Group PTFs for HTTP Server will also contain the fixes for this CVE.

Release 7.4 -  SI74088 
Release 7.3 -  SI74074 and SI74087
Release 7.2 -  SI74073

https://www-945.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

08 Sep 2020: 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

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Document Information

Modified date:
09 September 2020

UID

ibm16328811