Bug 1126914

Summary:	Ocetets Truncated with Python Bindings
Product:	Red Hat Enterprise Linux 6	Reporter:	kurt.frederiksen
Component:	net-snmp	Assignee:	Jan Safranek <jsafrane>
Status:	CLOSED ERRATA	QA Contact:	Dalibor Pospíšil <dapospis>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	6.7	CC:	dapospis
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	Cause: Net-SNMP Python bindings did not check input string of netsnmp_set call and copied only part of the string to the outgoing SNMP SET request when the string contained character with ASCII value 0. Consequence: A Python application could send invalid SNMP SET requests Fix: The Python binding copies full string, including any '\0' characters. Result: Applications send valid SNMP SET requests.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-07-22 07:22:55 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description kurt.frederiksen 2014-08-05 15:05:59 UTC

Description of problem:
Ocetets Truncated with Python Bindings.

Version-Release number of selected component (if applicable):
net-snmp-5.5-49.el6_5.1.x86_64

How reproducible:
Use net-snmp python bindings to set a SMI object that is of the DateAndTime. Use the date and time of 01/01/2010 00:00. Observe the result on the wire. Observe that the bindings read the '00' characters as a termination character.

Steps to Reproduce:
1. Install net-snmp-python
2. Set DateAndTime object with 01/01/2010 00:00
3. Observe result.

Actual results:
01/01/2010 00:00 is seen as 0x07da0101 on the wire. Which is wrong length per the SMI for DateAndTime per the SNMPv2-TC MIB.

Expected results:
01/01/2010 00:00 should result i na set of 0x07da0101000f0000.

Additional info:
This issue has been resolved in a later version of net-snmp.  A patch which backports the fix to net-snmp-5.5-49.el6_5.1.x86_64 can be found here http://sourceforge.net/p/net-snmp/bugs/2552/ . This patch has been tested by rebuilding the redhat rpm and installing it on the system.

Comment 2 Jan Safranek 2014-08-06 11:27:47 UTC

Thanks for the report.

Just for reference, this small python snippet sends 'hello' instead of 'hello.world', where '.' should be \0 character.

import netsnmp
oid = netsnmp.Varbind('sysDescr', val='hello\000world', type='OCTETSTR')
netsnmp.snmpset(oid, Version=2, DestHost='localhost', Community='public')

Comment 6 errata-xmlrpc 2015-07-22 07:22:55 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-1385.html