Secunia Research: Network Instruments Observer SNMP OID Processing Denial of Service

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                     Secunia Research 07/06/2012

                   - Network Instruments Observer -
      - SNMP OID Processing Denial of Service Vulnerability -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

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1) Affected Software 

* Observer version 15.1 Build 0007.0000

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Less critical
Impact: DoS
Where:  From local network

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3) Vendor's Description of Software 

"Our complete solution set not only provides the deepest drill-down
into network problems, it also provides back-in-time analysis,
reporting, trending, alarms, application tools, route monitoring,
and more."

Product Link:
http://www.networkinstruments.com/products/observer/index.html

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in Network Instruments
Observer, which can be exploited by malicious people to cause a DoS
(Denial of Service).

The vulnerability is caused due to an error in the
"CSnmp::ASN1_ReadObjIDValue()" method (NISNMP.DLL) when processing an
Object Identifier (OID) within a variable binding list. This can be
exploited to cause a limited stack-based buffer overflow and cause a
crash only via e.g. a specially crafted SetRequest SNMP datagram.

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5) Solution 

Restrict access to trusted hosts only.

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6) Time Table 

09/03/2012 - Requested security contact.
15/03/2012 - 2nd security contact request.
07/06/2012 - Public disclosure.

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7) Credits 

Discovered by Dmitriy Pletnev, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2012-0274 for the vulnerability.

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9) About Secunia

Secunia offers vulnerability management solutions to corporate
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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2012-20/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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