Request smuggling vulnerability may affect the IBM HTTP Server used by IBM WebSphere Application Server
DESCRIPTION: Apache HTTP Server is vulnerable to HTTP request smuggling, caused by a chunk header parsing flaw in the apr_brigade_flatten() function. By sending a specially-crafted request in a malformed chunked header to the Apache HTTP server, an attacker could exploit this vulnerability to poison the web cache, bypass web application firewall protection, and conduct XSS attacks.
CVSS Base Score: 6.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/104844 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
Affected Products and Versions
This vulnerability affects all versions and releases of IBM HTTP Server (powered by Apache) component in all editions of WebSphere Application Server and bundling products.
- Version 8.5.5
- Version 8.5
- Version 7.0
- Version 6.1
The recommended solutions is to apply the interim fix, Fix Pack or PTF containing APAR PI42928 for each named product as soon as practical.
For affected IBM HTTP Server for WebSphere Application Server:
For V18.104.22.168 through 22.214.171.124 Full Profile:
· Upgrade to a minimum of Fix Pack 126.96.36.199 or later then apply Interim Fix PI42928
· Apply Fix Pack 188.8.131.52 or later.
For V8.0 through 184.108.40.206:
· Upgrade to a minimum of Fix Pack 220.127.116.11 or later and then apply Interim Fix PI42928
· Apply Fix Pack 18.104.22.168 or later.
For V22.214.171.124 through 126.96.36.199:
· Upgrade to a minimum of Fix Pack 188.8.131.52 or later and then apply Interim Fix PI42928
· Apply Fix Pack 184.108.40.206 or later.
For V220.127.116.11 through 18.104.22.168:
· Upgrade to Fix Pack 22.214.171.124 and then apply cumulative Interim Fix PI45596 (this includes the fix for PI42928)
For unsupported versions IBM recommends upgrading to a fixed, supported version of the product.
Workarounds and Mitigations
Get Notified about Future Security Bulletins
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.
01 September 2015: original document 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.
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.
15 June 2018