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Security Bulletin: Vulnerabilities in the GSKit component of IBM HTTP Server (CVE-2016-0201 and CVE-2015-7420)

Security Bulletin


Two vulnerabilities have been addressed in the GSKit component of IBM HTTP Server.

Vulnerability Details

CVEID: CVE-2016-0201
DESCRIPTION: IBM GSKit could allow a remote attacker to obtain sensitive information, caused by a MD5 collision. An attacker could exploit this vulnerability to obtain authentication credentials.
CVSS Base Score: 5.9
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)

CVEID: CVE-2015-7420
A vulnerability in GSKit could allow a remote attacker to obtain sensitive information. The GSKit PRNG state is duplicated during a fork() system call operation which results in a period of time where child processes may generate identical PRNG output to the parent.
CVSS Base Score: 3.7
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/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 8.5.5
  • Version 8.5
  • Version 8.0


APAR PI54962 addresses CVE-2016-0201.

APAR PI52395 addresses CVE-2015-7420.

Both of these APARs are included in the interim fix for PI54962. So applying the APAR interim fix will resolve both issues.

The recommended solution is to apply the interim fix, Fix Pack or PTF containing APAR PI54962 for each named product as soon as practical.

For affected IBM HTTP Server for WebSphere Application Server:

For V8.5.0.0 through Full Profile:

· Apply Interim Fix PI54962

· Apply Fix Pack or later.

For V8.0.0.0 through

· Apply Interim Fix PI54962

· Apply Fix Pack or later.

Workarounds and Mitigations


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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.





Change History

27 January 2016: original version published
03 February 2016: removed minimal fix packs needed
13 September 2016: updated fix pack release dates

*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.

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Document Information

Modified date:
15 June 2018