Executive Summary

Summary
Title net-snmp: Authorization bypass
Informations
Name GLSA-201001-05 First vendor Publication 2010-01-13
Vendor Gentoo Last vendor Modification 2010-01-13
Severity (Vendor) Normal Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:P/I:N/A:N)
Cvss Base Score 5 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Synopsis

A remote attacker can bypass the tcp-wrappers client authorization in net-snmp.

Background

net-snmp bundles software for generating and retrieving SNMP data.

Description

The netsnmp_udp_fmtaddr() function (snmplib/snmpUDPDomain.c), when using TCP wrappers for client authorization, does not properly parse hosts.allow rules.

Impact

A remote, unauthenticated attacker could bypass the ACL filtering, possibly resulting in the execution of arbitrary SNMP queries.

Workaround

If possible, protect net-snmp with custom iptables rules:

iptables -s [client] -d [host] -p udp --dport 161 -j ACCEPT iptables -s 0.0.0.0/0 -d [host] -p udp --dport 161 -j DROP

Resolution

All net-snmp users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-analyzer/net-snmp-5.4.2.1-r1"

References

[ 1 ] CVE-2008-6123 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-6123

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-201001-05.xml

Original Source

Url : http://security.gentoo.org/glsa/glsa-201001-05.xml

CAPEC : Common Attack Pattern Enumeration & Classification

Id Name
CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
CAPEC-13 Subverting Environment Variable Values
CAPEC-17 Accessing, Modifying or Executing Executable Files
CAPEC-39 Manipulating Opaque Client-based Data Tokens
CAPEC-45 Buffer Overflow via Symbolic Links
CAPEC-51 Poison Web Service Registry
CAPEC-59 Session Credential Falsification through Prediction
CAPEC-60 Reusing Session IDs (aka Session Replay)
CAPEC-76 Manipulating Input to File System Calls
CAPEC-77 Manipulating User-Controlled Variables
CAPEC-87 Forceful Browsing
CAPEC-104 Cross Zone Scripting

CWE : Common Weakness Enumeration

% Id Name

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:10289
 
Oval ID: oval:org.mitre.oval:def:10289
Title: The netsnmp_udp_fmtaddr function (snmplib/snmpUDPDomain.c) in net-snmp 5.0.9 through 5.4.2.1, when using TCP wrappers for client authorization, does not properly parse hosts.allow rules, which allows remote attackers to bypass intended access restrictions and execute SNMP queries, related to "source/destination IP address confusion."
Description: The netsnmp_udp_fmtaddr function (snmplib/snmpUDPDomain.c) in net-snmp 5.0.9 through 5.4.2.1, when using TCP wrappers for client authorization, does not properly parse hosts.allow rules, which allows remote attackers to bypass intended access restrictions and execute SNMP queries, related to "source/destination IP address confusion."
Family: unix Class: vulnerability
Reference(s): CVE-2008-6123
 Version: 5
Platform(s): Red Hat Enterprise Linux 3
CentOS Linux 3
 Product(s):
Definition Synopsis:
Definition Id: oval:org.mitre.oval:def:12964
 
Oval ID: oval:org.mitre.oval:def:12964
Title: USN-946-1 -- net-snmp vulnerability
Description: The SNMP server did not correctly validate certain UDP clients when using TCP wrappers. Under some situations, a remote attacker could bypass access restrictions and communicate with the SNMP server, potentially leading to a loss of privacy or a denial of service.
Family: unix Class: patch
Reference(s): USN-946-1
CVE-2008-6123
 Version: 5
Platform(s): Ubuntu 10.04
 Product(s): net-snmp
Definition Synopsis:

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 28
Os 2
Os 1
Os 1

OpenVAS Exploits

Date Description
2011-08-09 Name : CentOS Update for net-snmp CESA-2009:0295 centos3 i386
File : nvt/gb_CESA-2009_0295_net-snmp_centos3_i386.nasl
2010-06-07 Name : Ubuntu Update for net-snmp vulnerability USN-946-1
File : nvt/gb_ubuntu_USN_946_1.nasl
2010-01-20 Name : Gentoo Security Advisory GLSA 201001-05 (net-snmp)
File : nvt/glsa_201001_05.nasl
2009-10-13 Name : SLES10: Security update for net-snmp
File : nvt/sles10_net-snmp0.nasl
2009-10-10 Name : SLES9: Security update for net-snmp
File : nvt/sles9p5052020.nasl
2009-07-06 Name : SuSE Security Summary SUSE-SR:2009:012
File : nvt/suse_sr_2009_012.nasl
2009-06-15 Name : SuSE Security Summary SUSE-SR:2009:011
File : nvt/suse_sr_2009_011.nasl
2009-03-31 Name : RedHat Security Advisory RHSA-2009:0295
File : nvt/RHSA_2009_0295.nasl
2009-03-31 Name : CentOS Security Advisory CESA-2009:0295 (net-snmp)
File : nvt/ovcesa2009_0295.nasl
2009-03-02 Name : Mandrake Security Advisory MDVSA-2009:056 (net-snmp)
File : nvt/mdksa_2009_056.nasl
2009-02-18 Name : Fedora Core 10 FEDORA-2009-1769 (net-snmp)
File : nvt/fcore_2009_1769.nasl

Open Source Vulnerability Database (OSVDB)

Id Description
51895 Net-SNMP TCP Wrapper SNMP Request Handling Information Disclosure

Nessus® Vulnerability Scanner

Date Description
2013-07-12 Name : The remote Oracle Linux host is missing one or more security updates.
File : oraclelinux_ELSA-2009-0295.nasl - Type : ACT_GATHER_INFO
2013-03-09 Name : The remote Ubuntu host is missing one or more security-related patches.
File : ubuntu_USN-946-1.nasl - Type : ACT_GATHER_INFO
2012-08-01 Name : The remote Scientific Linux host is missing one or more security updates.
File : sl_20090326_net_snmp_on_SL3_x.nasl - Type : ACT_GATHER_INFO
2010-02-25 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-201001-05.nasl - Type : ACT_GATHER_INFO
2010-02-07 Name : The remote openSUSE host is missing a security update.
File : suse_11_2_libsnmp15-100204.nasl - Type : ACT_GATHER_INFO
2009-09-24 Name : The remote SuSE 9 host is missing a security-related patch.
File : suse9_12441.nasl - Type : ACT_GATHER_INFO
2009-09-24 Name : The remote SuSE 10 host is missing a security-related patch.
File : suse_net-snmp-6248.nasl - Type : ACT_GATHER_INFO
2009-07-21 Name : The remote openSUSE host is missing a security update.
File : suse_11_0_libsnmp15-090514.nasl - Type : ACT_GATHER_INFO
2009-07-21 Name : The remote openSUSE host is missing a security update.
File : suse_11_1_libsnmp15-090514.nasl - Type : ACT_GATHER_INFO
2009-05-29 Name : The remote openSUSE host is missing a security update.
File : suse_libsnmp15-6247.nasl - Type : ACT_GATHER_INFO
2009-04-23 Name : The remote Fedora host is missing a security update.
File : fedora_2009-1769.nasl - Type : ACT_GATHER_INFO
2009-04-23 Name : The remote Mandriva Linux host is missing one or more security updates.
File : mandriva_MDVSA-2009-056.nasl - Type : ACT_GATHER_INFO
2009-03-27 Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2009-0295.nasl - Type : ACT_GATHER_INFO
2009-03-27 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2009-0295.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2014-02-17 11:36:48
  • Multiple Updates