Public Vulnerability Reports

Solaris snoop SMB Decoding Multiple Stack Buffer Overflow Vulnerabilities

08.04.08

BACKGROUND

The snoop command line utility is installed by default on Solaris. It is used to capture and display network traffic, similar to the widely used tcpdump program. Server Message Block (SMB), is a network protocol used for Microsoft Windows file sharing. More information can be found on the vendor's website at the following URL.

http://docs.sun.com/app/docs/doc/816-0211/6m6nc677k?a=view

DESCRIPTION

Remote exploitation of multiple stack-based buffer overflow vulnerabilities in Sun Microsystems Inc.'s snoop could allow an attacker to execute arbitrary code with the privileges of the nobody user.

Multiple buffer overflow vulnerabilities exist within the code that parses and displays SMB traffic. In most cases, exploitation is trivial as an attacker has full control of the data copied.

ANALYSIS

Exploitation of these vulnerabilities results in the execution of arbitrary code with the privileges of the nobody user. In addition, the attacker has access to the raw socket used by the snoop program. This allows them to capture any traffic visible to the network interface used.

Often in client-side vulnerabilities, an attacker only has a single chance to exploit the vulnerability. However, the snoop utility will handle any segmentation violations and attempt to continue capturing network traffic. This gives an attacker multiple opportunities to exploit a vulnerability, which increases the likelihood of successful exploitation.

DETECTION

iDefense has confirmed the existence of these vulnerabilities in snoop for Solaris 10 8/07. Other versions may also be affected.

WORKAROUND

iDefense is currently unaware of any workarounds for these issues.

VENDOR RESPONSE

Sun Microsystems has addressed these vulnerabilities with the release of patches for Solaris 8, 9, and 10, as well as OpenSolaris. For more information, refer to Sun Alert 240101 at the following URL.

http://sunsolve.sun.com/search/document.do?assetkey=1-26-240101-1

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2008-0964 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

01/24/2008 Initial vendor notification
01/25/2008 Initial vendor response
08/04/2008 Coordinated public disclosure

CREDIT

These vulnerabilities were reported to iDefense by Gael Delalleau.

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LEGAL NOTICES

Copyright © 2008 Verisign, Inc.

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