There are multiple vulnerabilities in the IBM HTTP Server used by WebSphere Application Server. This has been addressed.
DESCRIPTION: Apache HTTP Server is vulnerable to a heap-based buffer overflow, caused by improper bounds checking by the mod_session. By sending a specially crafted SessionHeader, a remote attacker could overflow a buffer and cause a denial of service.
CVSS Base score: 5.9
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/203465 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
DESCRIPTION: Apache HTTP Server is vulnerable to a denial of service, caused by a NULL pointer dereference. A remote attacker could exploit this vulnerability using a specially crafted Cookie header handled by mod_session to cause the system to crash.
CVSS Base score: 3.7
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/203464 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L)
Affected Products and Versions
This vulnerability affects the following version and release of IBM HTTP Server (powered by Apache) component in all editions of WebSphere Application Server and bundling products.
|IBM HTTP Server||9.0|
For IBM HTTP Server used by WebSphere Application Server:
For V220.127.116.11 through 18.104.22.168:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH06010.
· Apply Fix Pack 22.214.171.124 or later.
Additional interim fixes may be available and linked off the interim fix download page.
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be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential
Workarounds and Mitigations
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28 Jun 2021: 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.
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.
28 June 2021