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AUSCERT External Security Bulletin Redistribution
ESB-2019.0548
Vulnerabilities CVE-2018-17199, CVE-2018-17189, and
CVE-2019-0190 in the IBM i HTTP Server affect IBM i.
22 February 2019
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AusCERT Security Bulletin Summary
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Product: IBM i HTTP Server
Publisher: IBM
Operating System: IBM i
Impact/Access: Denial of Service -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-0190 CVE-2018-17199 CVE-2018-17189
Reference: ESB-2019.0252
ESB-2019.0192
Original Bulletin:
http://www.ibm.com/support/docview.wss?uid=ibm10872490
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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.
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
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
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.
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