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AUSCERT External Security Bulletin Redistribution
ESB-2018.3956
Multiple Vulnerabilities affect IBM Sterling External Authentication Server
21 December 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Sterling Secure Proxy
Publisher: IBM
Operating System: AIX
HP-UX
Linux variants
Solaris
Windows
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Provide Misleading Information -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-7658 CVE-2017-7657 CVE-2017-7656
Reference: ESB-2018.3913
ESB-2018.3744
ESB-2018.3163
Original Bulletin:
http://www.ibm.com/support/docview.wss?uid=ibm10792117
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Security Bulletin: Multiple Vulnerabilities affect IBM Sterling External
Authentication Server
Security Bulletin
Document information
More support for: Sterling Secure Proxy
Component: IBM Sterling External Authentication Server
Software version: 2.4.3, 2.4.2
Operating system(s): AIX, HP-UX, Linux, Solaris, Windows
Reference #: 0792117
Modified date: 19 December 2018
Summary
Three Eclipse Jetty request smuggling vulnerabilities were addressed by IBM
Sterling External Authentication Server.
Vulnerability Details
CVE-ID: CVE-2017-7656
Description: Eclipse Jetty is vulnerable to HTTP request smuggling, caused by a
flaw in the HTTP/1.x Parser. By sending a specially-crafted request, an
attacker could exploit this vulnerability to poison the web cache, bypass web
application firewall protection, and conduct XSS attacks.
CVSS Base Score: 6.5
CVSS Temporal Score:
https://exchange.xforce.ibmcloud.com/vulnerabilities/145520 for more information
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
CVE-ID: CVE-2017-7657
Description: Eclipse Jetty is vulnerable to HTTP request smuggling, caused by
improper handling of Chunked Transfer-Encoding chunk size. By sending a
specially-crafted request, an attacker could exploit this vulnerability to
poison the web cache, bypass web application firewall protection, and conduct
XSS attacks.
CVSS Base Score: 6.5
CVSS Temporal Score:
https://exchange.xforce.ibmcloud.com/vulnerabilities/145521 for more information
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
CVE-ID: CVE-2017-7658
Description: Eclipse Jetty is vulnerable to HTTP request smuggling, caused by a
flaw when handling more than one Content-Length headers. By sending a
specially-crafted request, an attacker could exploit this vulnerability to
poison the web cache, bypass web application firewall protection, and conduct
XSS attacks.
CVSS Base Score: 6.5
CVSS Temporal Score:
https://exchange.xforce.ibmcloud.com/vulnerabilities/145522 for more information
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
Affected Products and Versions
IBM Sterling External Authentication Server 2.4.3 through 2.4.3.2 iFix 2
IBM Sterling External Authentication Server 2.4.2 through 2.4.2 iFix 11
Remediation/Fixes
Product VRMF APAR How to acquire fix
IBM Sterling External
Authentication Server 2.4.3.2 iFix 3 Fix Central
IBM Sterling External
Authentication Server 2.4.2.0 iFix 12 Fix Central
Workarounds and Mitigations
None.
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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.
Reference
Complete CVSS v3 Guide
On-line Calculator v3
Related Information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Change History
19 December 2018: Original version 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.
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.
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