Security Vulnerability in the Solaris 10 DTrace Dynamic Tracing Framework May Allow Unauthorized Kernel Level Tracing

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Security Vulnerability in the Solaris 10 DTrace Dynamic Tracing Framework May Allow Unauthorized Kernel Level Tracing

1. Impact

A security vulnerability in the Solaris 10 DTrace (see dtrace(1M)) dynamic tracing framework may allow a local user or a non-global zone which has been granted either the PRIV_DTRACE_USER or the PRIV_DTRACE_PROC privilege (see privileges(5)) to be able to perform some kernel-level tracing.  Such users may then be able to access sensitive information.

2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform:

• Solaris 10 without patch 120011-04

x86 Platform:

• Solaris 10 without patch 120012-04

Note: Solaris 8 and Solaris 9 are not affected by this issue.

3. Symptoms

There are no predictable symptoms that would indicate the described issue has been exploited to view sensitive kernel data.

4. Workaround

If users have been granted any of the DTrace privileges, those privileges can be removed until the patches have been applied. The additional privileges may have been configured via policy.conf(4) or user_attr(4). If the privileges have been configured directly in the local "/etc/user_attr" file, they can be removed (as "root" user) with the usermod(1M) utility as in the following example:

# usermod -K limitpriv=all,!dtrace_user,!dtrace_proc user

If non-global zones have been granted any of these privileges, they can be removed with zonecfg(1M) as in the following example:

# zonecfg -z <zone name>
zonecfg:<zone-name> set limitpriv="default"
zonecfg:<zone-name> commit
zonecfg:<zone-name> exit

In order for this change to take effect, reboot the zone after the zone configuration is changed.

Note: Privileges may also be assigned via an execution profile (see exec_attr(4)) or even to running processes using ppriv(1).

5. Resolution

This issue is addressed in the following releases:

SPARC Platform:

• Solaris 10 with patch 120011-04 or later
  

x86 Platform:

• Solaris 10 with patch 120012-04 or later
  

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

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Modification History

28-Apr-2008: Updated Resolution section to add link for Security Technical Instruction doc

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