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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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