Title: Microsoft Java Virtual Machine getSystemResource Vulnerability
Severity: MODERATE
Description:
Microsoft's Java Virtual Machine will allow the reading of local file information by a remote Java application. This can be done two ways:
1: Via the getSystemResourceAsStream() function. The filename must be specified, and must be in certain paths: the JVM 'home' directory, and any directory in the CLASSPATH environment variable. For IE 5 the home directory is the current user's desktop, for IE4 it is C:\ . The specified file can be read.
2: Via the getSystemResource() function. Unlike the first function, this one will accept the ../ string in the pathname, making it possible to access any file on the same drive as the Java installation. However, the file cannot be read, it is only possible to verify the existence or non-existence of a file by this method.
Affected Products:
- Microsoft Internet Explorer 4.0
- Microsoft Internet Explorer 4.0 for Windows 95
- Microsoft Internet Explorer 4.0 for Windows NT 3.51
- Microsoft Internet Explorer 4.0 for Windows NT 4.0
- Microsoft Internet Explorer 5.0 for Windows 2000
- Microsoft Internet Explorer 5.0 for Windows 95
- Microsoft Internet Explorer 5.0 for Windows 98
- Microsoft Internet Explorer 5.0 for Windows NT 4.0
- Microsoft Virtual Machine 2000 Series
- Microsoft Virtual Machine 3000 Series
References:
- Java House Mailing List: Re-Warning: Yet Another Security Hole of 'Microsoft VM for Java'
- Java House Mailing List: [JavaHouse-Brewers:30411] Re: Warning: Yet Another Security Hole of `Microsoft V
- Microsoft: Frequently Asked Questions: Microsoft Security Bulletin MS00-011
- Microsoft: Q253562: FIX: Untrusted Code Can Access Files on End-User Systems
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