GLSA 201001-05: net-snmp: Authorization bypass
| Severity: | normal |
| Title: | net-snmp: Authorization bypass |
| Date: | 01/13/2010 |
| Bugs: | |
| ID: | 201001-05 |
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.
Affected packages
| Package | Vulnerable | Unaffected | Architecture(s) |
|---|---|---|---|
| net-analyzer/net-snmp | < 5.4.2.1-r1 | >= 5.4.2.1-r1 | All supported architectures |
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
Availability
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
Concerns?
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
License
Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.