Security Vulnerability in Solaris IP Tunnel Parameter Processing May Lead to a System Panic or Possible Execution of Arbitrary Code by Unprivileged Users

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Security Vulnerability in Solaris IP Tunnel Parameter Processing May Lead to a System Panic or Possible Execution of Arbitrary Code by Unprivileged Users

1. Impact

A security vulnerability in the Solaris 10 IP tunnel parameter processing (see tun(7M)) may allow a local unprivileged user the ability to panic the system or execute arbitrary commands with all (super-user) privileges. The ability to panic a system is a type of Denial of Service (DoS).
   
Sun acknowledges with thanks, Tobias Klein (http://www.trapkit.de/) for bringing this issue to our attention.

This issue is also referenced in the following document:


2. Contributing Factors

This issue can occur in the following releases:
   
SPARC Platform

• Solaris 10 without patch 138888-01
• OpenSolaris based upon builds snv_01 through snv_76

x86 Platform

• Solaris 10 without patch 138889-01
• OpenSolaris based upon builds snv_01 through snv_76

Notes:

1. Solaris 8 and 9 are not impacted by this issue.
2. Systems do not need to have tunneling configured to be vulnerable to this issue.

3. Symptoms

If the described issue occurs, the system may panic with a stack strace similar to the following:

ip_sioctl_tunparam()
ip_process_ioctl()
ip_wput()
putnext()
putnext()
strdoioctl()
strioctl()
spec_ioctl()
fop_ioctl()
ioctl()

4. Workaround

There is no workaround for this issue. Please see the Resolution section below.

5. Resolution

This issue is addressed in the following releases:

SPARC Platform

• Solaris 10 with patch 138888-01 or later
• OpenSolaris based upon builds snv_77 or later

x86 Platform

• Solaris 10 with patch 138889-01 or later
• OpenSolaris based upon builds snv_77 or later

For more information on Security Sun Alerts, see Technical Instruction ID 213557.

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Modification History

09-Jan-2008: Updated "Notes" in Contributing Factors section

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