DataRescue IDA Pro Remote Debugger Server Authentication Bypass Vulnerability
iDefense Security Advisory 03.23.07 http://labs.idefense.com/intelligence/vulnerabilities/ Mar 23, 2007
DataRescue Inc.'s IDA Pro is a disassembler and debugger for Windows, Linux, or Macintosh. It supports multiple binary formats as well as many processor architectures. For more information about IDA Pro, visit the vendor's website at the following URL.
Remote exploitation of a password bypass vulnerability in DataRescue Inc.'s IDA Pro Remote Debugger Server allows attackers to execute arbitrary code under the context of the user who is running the remote debugger server.
Since version 4.8, IDA Pro supports remote debugging of x86/AMD64 Windows PE applications and Linux ELF applications over TCP/IP networks. The IDA distribution ships with a debugger server for Windows, Linux, and (as of version 5.1) MacOS X.
The IDA Pro debugger server allows a user to specify a password for authentication by supplying the -P parameter. The vulnerability specifically exists in the the processor_request() function. This function is used for the initial packet exchange as well as subsequent requests. This function did not ensure that the remote user has authenticated prior to calling the perform_request() function. As such, attacker requests sent prior to authenticating would be processed normally.
Exploitation of the described vulnerability allows attackers to execute arbitrary code under the context of the user who starts the remote debugger server.
It should be noted that the debugger server does not run as a service. It must be manually executed. Additionally, the remote debugger server can only handle one debugger session at a time. As such, this vulnerability can not be exploited while the debugger server is in use.
iDefense has confirmed the existence of this vulnerability in the remote debugger server for Windows and Linux from IDA Pro versions 5.0 and 5.1. It is suspected that the MacOS X version and earlier versions are also affected.
In order to reduce exposure to this vulnerability, the remote debugger server should not be left running when it is not in use.
Additionally, access to the port used by the remote debugger server could be blocked with the use of a firewall.
VI. VENDOR RESPONSE
"Since this vulnerability is in the open part of IDA, we provide the corrected source code for the modified files."
DataRescue Inc. has made the fix available at the following URL.
VII. CVE INFORMATION
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.
VIII. DISCLOSURE TIMELINE
03/20/2007 Initial vendor notification 03/20/2007 Initial vendor response 03/23/2007 Coordinated public disclosure
This vulnerability was reported to iDefense by enhalos.
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X. LEGAL NOTICES
Copyright © 2007 iDefense, Inc.
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