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AUSCERT External Security Bulletin Redistribution
ESB-2014.1584
IBM PureApplication System - ModSecurity chunked header security bypass
15 September 2014
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM PureApplication System
Publisher: IBM
Operating System: AIX
Red Hat
Windows
Impact/Access: Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2013-5705
Reference: ESB-2014.1240
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21683965
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IBM PureApplication System - ModSecurity chunked header security bypass
Flash (Alert)
Document information
More support for:
PureApplication System
Security
Software version:
1.1.0.0, 1.1.0.1, 1.1.0.2, 1.1.0.3, 1.1.0.4
Operating system(s):
AIX, Linux Red Hat - xSeries, Windows
Reference #:
1683965
Modified date:
2014-09-12
Abstract
ModSecurity (mod_security) might allow remote attackers to bypass rules by
using chunked transfer coding with a capitalized Chunked value in the
Transfer-Encoding HTTP header.
Content
VULNERABILITY DETAILS:
CVE ID: CVE-2013-5705
DESCRIPTION:
ModSecurity (mod_security) might allow a remote attacker to bypass
security restrictions, caused by the improper handling of a
specially-crafted chunked header. An attacker could exploit this
vulnerability to bypass security filters and inject arbitrary content into
the system.
apache2/modsecurity.c in ModSecurity before 2.7.6 allows remote attackers
to bypass rules by using chunked transfer coding with a capitalized
Chunked value in the Transfer-Encoding HTTP header.
CVSS:
CVSS Base Score: 5
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/92236 for more
information
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:P/A:N)
*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.
AFFECTED PRODUCTS AND VERSIONS:
IBM PureApplication System 1.1 and later
REMEDIATION:
Upgrade to IBM PureApplication System Version 1.1.0.4 cFix3
Contact IBM Support if you have problems upgrading to this version of IBM
PureApplication System.
WORKAROUND(S) and MITIGATION(S):
Exposure in the IBM PureApplication System is reduced by other product
security measures, but the internal version of mod_security is being
replaced to remove possibilities of exposures.
REFERENCES:
Complete CVSS Guide ( http://www.first.org/cvss/cvss-guide.html)
On-line Calculator V2 (
http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2)
RELATED INFORMATION:
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
ACKNOWLEDGEMENT:
None
CHANGE HISTORY:
12 September 2014 - Original Copy Published
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.
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