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Vulnerability Alert

Net-SNMP SNMP GET Request Extension Table Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:25767
Version:5
First Published:2012 April 27 14:25 GMT
Last Published:2013 March 19 15:57 GMT
Port: Not available
CVE:CVE-2012-2141
BugTraq ID:53255
Urgency:Unlikely Use
Credibility:Highly Credible
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.3
 
Version Summary:MontaVista Software has released a changelog and updated software to address the Net-SNMP SNMP GET request extension table denial of service vulnerability.
 
 
Description

Net-SNMP contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to improper handling of certain SNMP requests by the affected software.  An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted SNMP GET request to the targeted system.  If successful, this action could terminate the affected software unexpectedly, resulting in a DoS condition on the targeted system.

Net-SNMP has confirmed this vulnerability. However, updated software is not available.

 
Warning Indicators

Net-SNMP version 5.7.1 is vulnerable.  Other versions may also be affected.

 
IntelliShield Analysis

To exploit this vulnerability, the attacker would need to send crafted SNMP GET requests to the targeted system.  Depending on the network configuration, the attacker would need access to trusted, internal networks. The attacker would also need read privileges for a MIB subtree.

 
Vendor Announcements

Net-SNMP has released a bug report at the following link: CVE-2012-2141

MontaVista Software has released a changelog for registered users on March 14, 2013, at the following link: MontaVista Security Fixes

Red Hat has released an official CVE statement and additional security advisories for bug 815813 at the following links: CVE-2012-2141, RHSA-2012:0876 and RHSA-2013:0124

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to terminate the affected software unexpectedly, resulting in a DoS condition on the targeted system.

 
Technical Information

The vulnerability is in the handle_nsExtendOutput2Table() function that is used by the affected software.

An unauthenticated, remote attacker could exploit this vulnerability by sending crafted SNMP GET requests for a nonexistent extension table entry.  If successful, this action could allow the attacker to terminate the affected software unexpectedly, resulting in a DoS condition.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators are advised to monitor affected systems.

 
Patches/Software

CentOS packages can be updated using the up2date or yum command.

MontaVista Software has released updated software for registered users at the following links:

Pro 5.0.24
Pro 5.0
Pro 4.0.1
CGE 5.1
CGE 4.0.1
Mobilinux 5.0.24
Mobilinux 5.0
Mobilinux 4.1
Mobilinux 4.0.2

Red Hat has released updated software for registered subscribers at the following link: Red Hat Network. Red Hat packages can be updated on Red Hat Enterprise Linux versions 5 and later using the yum tool.

 
Alert History
 

Version 4, January 8, 2013, 6:27 AM: Red Hat has released an additional security advisory and updated packages to address the Net-SNMP SNMP GET request extension table denial of service vulnerability.

Version 3, July 11, 2012, 8:07 AM: CentOS has released updated packages to address the Net-SNMP SNMP GET request extension table denial of service vulnerability.

Version 2, June 22, 2012, 3:27 PM: Red Hat has released a security advisory and packages to address the Net-SNMP SNMP GET request extension table denial of service vulnerability.

Version 1, April 27, 2011, 9:25 AM: Net-SNMP contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition.  Updates are not available.



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
SourceForgenet-snmp 5.7.1 Base

Associated Products:
CentOS ProjectCentOS 6 .0 i386, .0 x86_64, .1 i386, .1 x86_64, .2 i386, .2 x86_64
MontaVistaMontaVista Linux Professional 4.0.1, 5.0, 5.0.24 | Mobilinux 4.0.2, 4.1, 5.0, 5.0.24 | CGE 4.0.1, 5.1
Red Hat, Inc.Red Hat Enterprise Linux 5 IA-32, IA-64, PPC, ppc64, s390, s390x, x86_64
Red Hat, Inc.Red Hat Enterprise Linux Desktop 5 IA-32, x86_64 | 6 IA-32, x86_64
Red Hat, Inc.Red Hat Enterprise Linux Desktop Workstation 5 IA-32, x86-64
Red Hat, Inc.Red Hat Enterprise Linux HPC Node 6 x86_64
Red Hat, Inc.Red Hat Enterprise Linux Server 6 IA-32, PPC, s390x, x86_64
Red Hat, Inc.Red Hat Enterprise Linux Workstation 6 IA-32, x86_64




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