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AUSCERT External Security Bulletin Redistribution
ESB-2015.2594
Security Bulletin: IBM Personal Communications with IBM GSKit - Malformed
ECParameters causes infinite loop (CVE-2015-1788)
14 October 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Personal Communications
Publisher: IBM
Operating System: Windows
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-1788
Reference: ESB-2015.1878
ESB-2015.1811
ESB-2015.1809
ESB-2015.1699
ESB-2015.1670
ESB-2015.1569
ESB-2015.1557
ESB-2015.1544.2
ESB-2015.1540
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21962890
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Security Bulletin: IBM Personal Communications with IBM GSKit - Malformed
ECParameters causes infinite loop (CVE-2015-1788)
Security Bulletin
Document information
More support for:
Personal Communications
Software version:
6.0, 6.0.1, 6.0.2, 6.0.3, 6.0.4, 6.0.5, 6.0.6, 6.0.7, 6.0.8, 6.0.9, 6.0.10,
6.0.11, 6.0.12, 6.0.13, 6.0.14, 6.0.15
Operating system(s):
Windows
Reference #:
1962890
Modified date:
2015-10-13
Summary
GSKit is an IBM component that is used by IBM Personal Communications. The
GSKit that is shipped with IBM Personal Communications does not properly
handle ECParameters structures in which the curve is over a malformed binary
polynomial field, which allows remote attackers to cause a denial of service
(infinite loop) via a session that uses an Elliptic Curve algorithm, as
demonstrated by an attack against a server that supports client
authentication.
Vulnerability Details
CVEID: CVE-2015-1788
DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by an error
when processing an ECParameters structure over a specially crafted binary
polynomial field. A remote attacker could exploit this vulnerability to cause
the application to enter into an infinite loop.
CVSS Base Score: 5
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/103778 for the current
score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
This can be used to perform denial of service against any system which
processes public keys, certificate requests or certificates. This includes TLS
clients and TLS servers with client authentication enabled.
Cryptographic Service Provider - IBM GSKit used to establish secure
connections to host machines using IBM Personal Communications may be
affected.
Affected Products and Versions
IBM Personal Communications 6.0.15 and earlier
Remediation/Fixes
Fix is available with IBM GSKit 8.0.50.47 bundled with IBM Personal
Communications 6.0.16.
http://www-01.ibm.com/support/docview.wss?uid=swg27009828
Workarounds and Mitigations
None
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alerts like this.
References
Complete CVSS v2 Guide
On-line Calculator v2
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Change History
Original copy published on 14th October 2015
*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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