iDefense Security Advisory 04.15.10
Apr 15, 2010
Agent Extensibility (AgentX) Protocol was designed to address
interoperability issues with extensible SNMP agents. AgentX++ is a C++
implementation of the AgentX protocol. It is one of several C++ based
SNMP libraries developed by Frank Fock. For more information refer to
the URLs below.
Remote exploitation of an integer overflow vulnerability within
AgentX++, as distributed with multiple vendors' products, allows
attackers to execute arbitrary code with the privileges of the AgentX
This vulnerability exists within the AgentX::receive_agentx function. If
an attacker sends a request specifying the maximum 32-bit integer as the
payload length, adding one will cause an integer overflow, resulting in
the allocation of a "0" size buffer. Since an attacker can send as
much, or as little, data as they wish, they can overflow the allocated
heap buffer by an arbitrary amount.
Exploitation allows an attacker to execute arbitrary code with the
privileges of the running AgentX master process. In order to exploit
this vulnerability, the attacker must be able to connect to the AgentX
master port, usually TCP port 705. No authentication is required.
The privileges with which this process runs varies in other situations.
In order to listen on ports below 1024, root privileges are required.
The master agent included with RealNetwork Helix Server v12 does not
drop privileges after opening this port.
Although the issue is present in the Windows version of Helix Server
v12, it is not exploitable due the implementation of the "recv"
function in Winsock. In Windows, the "recv" function buffers incoming
data, and will return a "WSAENOBUFS" error when a request is made for
more bytes than will fit in the buffer. No data is read in this case.
iDefense confirmed the existence of this vulnerability in the following
RealNetworks Helix Server v12 on Linux
RealNetworks Helix Server v12 on Windows 2003 SP2
AgentX++ source code v1.4.16
All products utilizing the AgentX++ library are suspected to be
vulnerable. Helix Server and Helix Mobile server versions prior to
14.0.0 are vulnerable (11.x,12.x and 13.x series).
iDefense is currently unaware of any workarounds for this issue.
VI. VENDOR RESPONSE
RealNetworks Inc. has released a patch which addresses this issue. For
more information, consult their advisory at the following URL.
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2010-1319 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
VIII. DISCLOSURE TIMELINE
11/03/2008 Initial Vendor Notification
01/14/2009 Initial Vendor Reply
04/15/2010 Coordinated Public Disclosure
This vulnerability was discovered by Joshua J. Drake of iDefense Labs.
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X. LEGAL NOTICES
Copyright =A9 2010 iDefense, Inc.
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