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Security Bulletin: An Eclipse Jetty Vulnerability Affects IBM Sterling Secure External Authentication Server (CVE-2020-27216)

Security Bulletin


A vulnerability allowing Eclipse Jetty to gain elevated privileges was addressed by IBM Sterling Secure External Authentication Server.

Vulnerability Details

CVEID:   CVE-2020-27216
DESCRIPTION:   Eclipse Jetty could allow a local authenticated attacker to gain elevated privileges on the system, caused by a race condition in the creation of the temporary subdirectory. By sending a specially-crafted request, an authenticated attacker could exploit this vulnerability to gain elevated privileges.
CVSS Base score: 7.8
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

Affected Product(s)Version(s)
IBM External Authentication Server6.0.0 through iFix 2
IBM Sterling External Authentication Server2.4.3 through iFix 9





Remediation/First Fix

IBM Secure External Authentication Server

iFix 3

Fix Central

IBM Sterling External Authentication Server

iFix 10

Fix Central

Workarounds and Mitigations


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Change History

8 January 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.

Document Location


[{"Business Unit":{"code":"BU012","label":"WCE"},"Product":{"code":"SS6PNW","label":"Sterling Secure Proxy"},"Component":"Sterling External Authentication Server","Platform":[{"code":"PF051","label":"Linux on IBM Z Systems"},{"code":"PF027","label":"Solaris"},{"code":"PF002","label":"AIX"},{"code":"PF010","label":"HP-UX"},{"code":"PF016","label":"Linux"},{"code":"PF033","label":"Windows"}],"Version":",","Edition":""}]

Document Information

Modified date:
08 January 2021