1. /
  2. Security Response/
  3. Microsoft .NET Framework Type Verification Remote Code Execution Vulnerability

Microsoft .NET Framework Type Verification Remote Code Execution Vulnerability

Risk

High

Date Discovered

October 13, 2009

Description

The .NET Framework is prone to a remote code-execution vulnerability because it fails to properly verify .NET applications before running them. Successful exploits may allow an attacker to execute arbitrary code with the privileges of the currently logged-in user. Failed attacks will cause denial-of-service conditions. In a web hosting environment, attacker-supplied code will run with the privileges of the service account associated with the identity of the application pool that the malicious .NET application is running under.

Technologies Affected

  • Microsoft .NET Framework 2.0
  • Microsoft .NET Framework 2.0 SP1
  • Microsoft .NET Framework 3.5
  • Nortel Networks CallPilot 1002rp
  • Nortel Networks CallPilot 200i
  • Nortel Networks CallPilot 201i
  • Nortel Networks CallPilot 702t
  • Nortel Networks CallPilot 703t
  • Nortel Networks Communication Control Toolkit 5.0
  • Nortel Networks Communication Control Toolkit 6.0
  • Nortel Networks Communication Control Toolkit 7.0
  • Nortel Networks Contact Center - Symposium Agent
  • Nortel Networks Contact Center - TAPI Server
  • Nortel Networks Contact Center Administration CCMA 6.0
  • Nortel Networks Contact Center Administration CCMA 7.0
  • Nortel Networks Contact Center Express
  • Nortel Networks Contact Center Manager Server
  • Nortel Networks Contact Center Manager Server 6.0
  • Nortel Networks Contact Center Multimedia
  • Nortel Networks Contact Center Multimedia & Outbound 6.0
  • Nortel Networks Contact Center Multimedia & Outbound 7.0
  • Nortel Networks Contact Center NCC
  • Nortel Networks LinkPlexer 6.0
  • Nortel Networks Self-Service - CCSS7
  • Nortel Networks Self-Service CCXML
  • Nortel Networks Self-Service MPS 100
  • Nortel Networks Self-Service MPS 1000
  • Nortel Networks Self-Service MPS 500
  • Nortel Networks Self-Service Peri Application
  • Nortel Networks Self-Service Peri Workstation
  • Nortel Networks Self-Service Speech Server
  • Nortel Networks Self-Service VoiceXML
  • Nortel Networks Self-Service WVADS
  • Nortel Networks Symposium Agent 2.3
  • Nortel Networks Symposium Express Call Center (SECC)
  • Nortel Networks Symposium Express Call Center (SECC) 4.2
  • Nortel Networks Symposium TAPI Service Provider 3.0

Recommendations

Run all software as a nonprivileged user with minimal access rights.

To reduce the impact of latent vulnerabilities, always run nonadministrative software as an unprivileged user with minimal access rights.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.

Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This includes but is not limited to requests that include NOP sleds and unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.

Do not accept or execute files from untrusted or unknown sources.

To reduce the likelihood of successful attacks never handle or open files from unknown sources.

Do not follow links provided by unknown or untrusted sources.

To reduce the likelihood of successful exploits, never visit sites of questionable integrity or follow links provided by unfamiliar or untrusted sources.

Implement multiple redundant layers of security.

Memory-protection schemes (such as nonexecutable stack and heap configurations and randomly mapped memory segments) will complicate exploits of memory-corruption vulnerabilities.
The vendor has released updates and an advisory. Please see the references for details.

Credits

Jeroen Frijters of Sumatra
Copyright © Symantec Corporation.
Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.

Disclaimer
The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
Symantec, Symantec products, Symantec Security Response, and secure@symantec.com are registered trademarks of Symantec Corp. and/or affiliated companies in the United States and other countries. All other registered and unregistered trademarks represented in this document are the sole property of their respective companies/owners.

Threat Intelligence

Subscribe
Follow the Threat Intelligence Twitter feed
STAR Antimalware Protection Technologies
Internet Security Threat Report
Symantec DeepSight Screensaver