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Security Bulletin: Vulnerabilities CVE-2018-17199, CVE-2018-17189, and CVE-2019-0190 in the IBM i HTTP Server affect IBM i.

Security Bulletin


Summary

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

Vulnerability Details

CVEID: CVE-2019-0190
DESCRIPTION: Apache HTTP Server is vulnerable to a denial of service, caused by the improper handling of client negotiations by mod_ssl. By sending a specially crafted request, a remote attacker could exploit this vulnerability to cause the application to enter into an infinite loop.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/156005 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

CVEID: CVE-2018-17189
DESCRIPTION: Apache HTTP Server is vulnerable to a denial of service. By sending request bodies in a slow loris way to plain resources, a remote attacker could exploit this vulnerability to cause a denial of service for HTTP/2 connections.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/156007 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

CVEID: CVE-2018-17199
DESCRIPTION: Apache HTTP Server could allow a remote attacker to bypass security restrictions, caused by checking the session expiry time before decoding the session by mod_session. An attacker could exploit this vulnerability to ignore session expiry time and gain access to the application.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/156006 for the current score
CVSS Environmental Score*: Undefined
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

Release 7.3 of IBM i is affected.


Remediation/Fixes

The issue can be fixed by applying a PTF to IBM i.

Release 7.3 of IBM i is supported and will be fixed.

https://www-945.ibm.com/support/fixcentral/

The IBM i PTF number is:

Release 7.3 - SI68962

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

Reference

Complete CVSS v3 Guide
On-line Calculator v3

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

20 February 2019: Original Version Published

*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 information

More support for: IBM i 7.3

Software version: All Versions

Operating system(s): IBM i

Reference #: 0872490

Modified date: 20 February 2019