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Security Bulletin: Potential vulnerability in IBM HTTP Server (CVE-2016-8743)

Security Bulletin


Summary

There is a potential response splitting attack vulnerability in IBM HTTP Server.

Vulnerability Details

CVEID: CVE-2016-8743
DESCRIPTION:
Apache HTTPD is vulnerable to HTTP response splitting attacks, caused by improper validation of user-supplied input. A remote attacker could exploit this vulnerability to inject arbitrary HTTP headers and cause the server to return a split response, once the URL is clicked. This would allow the attacker to perform further attacks, such as Web cache poisoning or cross-site scripting, and possibly obtain sensitive information.
CVSS Base Score: 6.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/119917 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)

Affected Products and Versions

These vulnerabilities affect the following versions and releases of IBM HTTP Server (powered by Apache) component in all editions of WebSphere Application Server and bundling products.

  • Version 9.0
  • Version 8.5
  • Version 8.0
  • Version 7.0

Remediation/Fixes

Note: The PI73984 interim fix files referenced below for IHS versions 8.0.0.11, 8.0.0.12 and 8.5.5.10 were republished on April 12, 2017 due to a problem with the fix file packaging. If you installed those particular interim fixes prior to or on that date you should obtain the updated fix files, then uninstall the earlier fix and reinstall with the April 12 interim fix.
For affected IBM HTTP Server for WebSphere Application Server:

For V9.0.0.0 through 9.0.0.2:

· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PI73984

--OR--
· Apply Fix Pack 9.0.0.3 or later.


For V8.5.0.0 through 8.5.5.11:

· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PI73984

--OR--
· Apply Fix Pack 8.5.5.12 or later.


For V8.0.0.0 through 8.0.0.13:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PI73984

--OR--
· Apply Fix Pack 8.0.0.14 or later (targeted availability 16 October 2017).


For V7.0.0.0 through 7.0.0.41:

· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PI73984

--OR--
· Apply Fix Pack 7.0.0.43 or later.

Workarounds and Mitigations

none

Get Notified about Future Security Bulletins

References

Complete CVSS v3 Guide
On-line Calculator v3

Related information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

31 January 2017: original document published
13 April 2017: updated interim fixes

*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.

Related information

A Japanese translation is available

Cross reference information
Segment Product Component Platform Version Edition
Application Servers WebSphere Application Server

Document information

More support for: IBM HTTP Server

Software version: 7.0, 8.0, 8.5, 8.5.5, 9.0

Operating system(s): AIX, HP-UX, Linux, Solaris, Windows, z/OS

Reference #: 1996847

Modified date: 13 April 2017


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