oss-security - CVE request: net-snmp agentx incorrect handling of multi-object requests DoS

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAA7hUgH_2zmu5FxD_oEMBqFDuDryiosJS=Ra8SJyPQCLnaHyWQ@mail.gmail.com>
Date: Thu, 6 Mar 2014 15:22:07 +0100
From: Raphael Geissert <geissert@...ian.org>
To: oss-security@...ts.openwall.com
Subject: CVE request: net-snmp agentx incorrect handling of multi-object
 requests DoS

Hi,

It was found that the AgentX subagent of net-snmp can be stalled when
a manager sends a multi-object request with a different number of
subids. From the Debian bug report:

> This happens if one of the requested OID is larger than the previous one:
>
> agentx/master: request for variable (iso.3.6.1.2.1.2.2.1.7.7)
> agentx/master: request for variable (iso.3.6.1.2.1.2.2.1.2.10)
> agentx/master: request for variable (iso.3.6.1.2.1.2.2.1.8.7)
> agentx/master: request for variable (iso.3.6.1.3.53.5.5.2.1.3.101)
>
> First three OID contain 11 subid while the next one has 12 subid.

Resulting error message from the subagent:
> agentx: Oversized Object ID

The bug is fixed upstream for the 5.4 branch in 5.4.4. From the
upstream bug report this was also fixed in the 5.3 branch but I don't
know on what specific version.

Could a CVE id be assigned?

Thanks

Upstream bug report:
http://sourceforge.net/p/net-snmp/patches/1113/
More explicit impact:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684388

Cheers,
-- 
Raphael Geissert - Debian Developer
www.debian.org - get.debian.net

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.