Vulnerability in Hex-Rays IDA Pro, IDAPython Plugin Could Allow Arbitrary Script Execution

Executive Summary

Microsoft is providing notification of the discovery and remediation of a vulnerability affecting IDA Pro running the IDAPython plugin. By default, the IDAPython plugin is installed with all versions of IDA Pro. Microsoft discovered and disclosed the vulnerability under coordinated vulnerability disclosure to the affected vendor, Hex-Rays. Hex-Rays has remediated the vulnerability in their software.

A vulnerability exists in the way that IDA Pro running the IDAPython plugin parses IDB files that could allow an attacker to execute arbitrary script. An attacker who successfully exploited this vulnerability could execute a script with the same user rights as the logged-on user. If a user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

Microsoft Vulnerability Research reported this issue to and coordinated with Hex-Rays to ensure remediation of this issue. The vulnerability has been assigned the entry CVE-2011-4783, in the Common Vulnerabilities and Exposures list. For more information about updates from Hex-Rays, visit the Hex-Rays IDA Pro website.

Mitigating Factors

• The vulnerability cannot be exploited automatically through email. For an attack to be successful, a user must open an attachment that is sent in an email message.
• In a Web-based attack scenario, an attacker could host a website that contains a specially crafted file that is used to exploit this vulnerability. In addition, compromised websites and websites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these websites. Instead, an attacker would have to convince users to visit the website, typically by getting them to click a link in an email message or Instant Messenger message that takes users to the attacker’s website, and then convince them to open the specially crafted file.
• An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.