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Sun Microsystems Solaris srsexec Format String Vulnerability

11.02.07

BACKGROUND

The srsexec utility is part of the SRS Proxy Core package that is available with Solaris 10. This package is used to monitor the performance of clients running Solaris from a centralized administrative console. This software would be installed on all of the client machines being monitored and is set-uid root by default. More information is available at the vendor's site.

http://www.sun.com/service/netconnect/

DESCRIPTION

Local exploitation of a format string vulnerability in the srsexec binary, optionally included in Sun Microsystems Inc.'s Solaris 10, allows attackers to execute arbitrary code with root privileges.

The vulnerability exists since attacker supplied data is passed directly to the syslog() function as the format string. This allows an attacker to overwrite arbitrary memory with arbitrary data, and can result in the execution of arbitrary code with root privileges.

ANALYSIS

Exploitation results in the execution of arbitrary code with root privileges. In order to exploit this vulnerability, an attacker must have the ability to execute the set-uid root binary.

The SRS Proxy Core package is not installed by default, but it is a common application.

DETECTION

iDefense has confirmed the existence of this vulnerability in Solaris 10 with the SUNWsrspx package installed. In order to determine if this package is installed, an administrator can execute the following command:

 pkginfo SUNWsrspx 

If this command returns 'ERROR: information for "SUNWsrspx" was not found', then the system does not have the affected package installed and is not vulnerable.

WORKAROUND

To prevent exploitation of this vulnerability, remove the set-uid bit from the srsexec binary as shown below.

 # chmod -s /opt/SUNWsrspx/bin/srsexec 

VENDOR RESPONSE

Sun Microsystems has addressed this vulnerability by releasing patches. For more information, consult Sun Alert 103119 at the following URL.

http://sunsolve.sun.com/search/document.do?assetkey=1-26-103119-1

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-3880 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

07/18/2007 Initial vendor notification
07/18/2007 Initial vendor response
11/02/2007 Coordinated public disclosure

CREDIT

This vulnerability was discovered by Sean Larsson of VeriSign iDefense Labs.

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LEGAL NOTICES

Copyright © 2007 Verisign, Inc.

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Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.