Security Bulletin
Summary
There are multiple vulnerabilities in the IBM HTTP Server used by WebSphere Application Server. This has been addressed.
Vulnerability Details
CVEID: CVE-2021-26691
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)
CVEID: CVE-2021-26690
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.
| Affected Product(s) | Version(s) |
| IBM HTTP Server | 9.0 |
Remediation/Fixes
For IBM HTTP Server used by WebSphere Application Server:
For V9.0.0.0 through 9.0.0.10:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH06010.
--OR--
· Apply Fix Pack 9.0.0.11 or later.
Additional interim fixes may be available and linked off the interim fix download page.
Important Note
IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and
integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will
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
risk.
Workarounds and Mitigations
None
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References
Acknowledgement
Change History
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.
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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Document Information
Modified date:
28 June 2021
UID
ibm16467651