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AUSCERT External Security Bulletin Redistribution
Security Bulletin: Potential Denial of Service (DoS) security vulnerability
in IBM Sterling External Authentication Server
27 September 2012
AusCERT Security Bulletin Summary
Product: IBM Sterling External Authentication Server
Operating System: AIX
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2011-4461
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Security Bulletin: Potential Denial of Service (DoS) security vulnerability in
IBM Sterling External Authentication Server
Sterling Secure Proxy
External Authentication Server
3.3, 3.3.1, 3.4
AIX, HP-UX, Linux, Solaris, Windows
Potential Denial of Service (DoS) security vulnerability in IBM Sterling
External Authentication Server due to a Java HashTable security vulnerability
in Jetty (CVE-2011-4461).
SUMMARY: Potential Denial of Service (Dos) security vulnerability in IBM
Sterling External Authentication Server due to multiple Java HashTable
security vulnerabilities in the embedded Jetty web server.
CVE ID: CVE-2011-4461
DESCRIPTION: IBM Sterling External Authentication Server is potentially
vulnerable to Denial of Service attacks because one of its embedded
components, Jetty, has multiple security vulnerability. The vulnerability is
caused by insufficient randomization of hash data structures. A remote
attacker could exploit this vulnerability to cause the consumption of CPU
resources. Customers who are using IBM Sterling External Authentication Server
may be impacted by this Jetty vulnerability which can cause performance or
Denial of Service (DoS) issues.
CVSS: CVSS Base Score: 2
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/72017 for the
current score CVSS
Environmental Score*: Undefined
CVSS String: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
The following IBM Sterling External Authentication Server Versions are
affected: Version 2.2.00 through 22.214.171.124 Version 126.96.36.199 through 188.8.131.52
Version 184.108.40.206 through 220.127.116.11 Version 18.104.22.168 (GA)
The recommended solution is to apply the fix for each version as soon as
practical. See below for information on fixes available.
For V22.214.171.124 through 126.96.36.199:
Install Fix Pack 10 (188.8.131.52), or later, if your environment is not
already at this level. Customers at releases prior to SEAS 2.3.1 should use
this Fix Pack to upgrade to SEAS 184.108.40.206.
For V220.127.116.11 through 18.104.22.168:
Install Fix Pack 3 (22.214.171.124) or later, if your environment is not already
at this level.
For V126.96.36.199 through 188.8.131.52:
Install Fix Pack 1 (184.108.40.206).
WORKAROUND(S): None known; apply fixes
MITIGATION(S): None known
REFERENCES: Complete CVSS Guide On-line Calculator V2 X-Force Vulnerability
For more information see: http://www.ocert.org/advisories/ocert-2011-003.html
IBM Secure Engineering Web Portal IBM Product Security Incident Response Blog
*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 Flash.
Note: 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
Copyright and trademark information
IBM, the IBM logo and ibm.com are trademarks of International Business
Machines Corp., registered in many jurisdictions worldwide. Other product and
service names might be trademarks of IBM or other companies. A current list of
IBM trademarks is available on the Web at "Copyright and trademark
information" at www.ibm.com/legal/copytrade.shtml.
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