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 i	7.4
IBM i	7.3
IBM i	7.2

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

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References

Complete CVSS v3 Guide
On-line Calculator v3

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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

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

Document Location

Worldwide

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