Public Vulnerability Reports

Sun Java System Web Proxy Multiple Buffer Overflow Vulnerabilities



Sun Microsystems Inc's Java System is a collection of server applications bundled together. One such server application included is the Web Proxy Server. This software implements proxy services including HTTP and SOCKSv5. For more information, visit the following URL.


Remote exploitation of multiple stack-based buffer overflows in Sun Microsystems Inc's Java System Web Proxy allows unauthenticated attackers to execute arbitrary code with superuser privileges.

The problem specifically exists within the "sockd" daemon. This daemon implements SOCKS proxy support for the Web Proxy product. Attackers can cause a buffer overflow by manipulating certain bytes during protocol negotiation.


Exploitation allows attackers to execute arbitrary code with the privileges of the user running "sockd", typically root.

No authentication is required to trigger this vulnerability. The attacker only needs the ability to open a session with the SOCKS server.

The server runs under a watchdog process which will restart the server in cases when it will fail. This allows attackers to repeatedly attempt to exploit the issue.


iDefense has confirmed the existence of this vulnerability using version 4.0.3 of Sun Java Web Proxy Server. Lab tests were performed on an x86 RedHat enterprise Linux machine. Previous versions, including products released under the "Sun ONE" product line, are suspected to be vulnerable.


Disabling the SOCKS proxy server will prevent exploitation of this vulnerability. Additionally, employing firewalls to limit access to the affected service will prevent untrusted users from exploiting this vulnerability.


Sun Microsystems has addressed these vulnerabilities in Sun Alert ID 102927. For more information visit the following URL.


A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.


03/20/2007 Initial vendor notification
03/22/2007 Initial vendor response
05/25/2007 Coordinated public disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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Copyright © 2007 Verisign, Inc.

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