J-Security Center

Title: Working Resources BadBlue cleanSearchString() Cross Site Scripting Vulnerability

Severity: MODERATE

Description:

BadBlue is a P2P file sharing application distributed by Working Resources. It is designed for use on Microsoft Windows operating systems. BadBlue is operated through a web interface, generated by an included web server running on the local system.

This issue is a variant of BID 5086 "Working Resources BadBlue EXT.DLL Cross Site Scripting Vulnerability". It has been reported that EXT.DLL has been re-designed to pass user supplied input to the cleanSearchString function. This protective measure may, however, be bypassed.

User supplied input is included in a generated HTML form as the hidden variable "a0". As this input is not sanitized, it is possible to include special characters and arbitrary javascript code, which will then execute within the context of the website hosting the vulnerable server.

Additionally, the cleanSearchString function is implemented in JavaScript, and performed on the client machine. As a result, unsanitized input passed to the script must first be rendered to the client machine. Carefully crafted input may modify the function call, and again result in malicious input being rendered to the client system.

An attacker may construct a malicious link to the EXT.DLL page on the local system. When the malicious link is visited, the attacker's script code will be executed in the web client of the user browsing the link, in the security context of the website hosting the vulnerable software. Under normal usage, the code may gain local system access.

This has been reported in BadBlue 1.73, earlier versions may also be affected.

Affected Products:

  • Working Resources Inc. BadBlue Personal Edition 1.7.3

References:

Juniper Networks provides this content via a wide variety of sources and production methods. If notified of errors or omissions in the content of this page, Juniper Networks, at its discretion, will modify or remove the page or leave the content as is, depending on various factors including but not limited to the reputation and authority of the party providing the notification. Please use the contact information displayed elsewhere on this page to report any errors or omissions regarding the content on this page.