Security Vulnerability in Solaris Auditing Related to Extended File Attributes ... (see below)

1. Impact

A security vulnerability in Solaris Auditing when interacting with extended file
attributes (fsattr(5)) may allow a local unprivileged user to be able to panic the
system. The ability to panic a system is a type of Denial of Service (DoS).

2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform

• Solaris 9 without patch 122300-39
• Solaris 10 without patch 140921-01
• OpenSolaris based upon builds snv_01 through snv_120
  

x86 Platform

• Solaris 9 without patch 122301-39
• Solaris 10 without patch 140922-01
• OpenSolaris based upon builds snv_01 through snv_120
  

Notes:

1. Solaris 8 is not impacted by this issue.

2. This issue only affects systems which have Solaris Auditing (see bsmconv(1M))
enabled. To determine if a system has Solaris Auditing enabled the grep(1) command
can be used to search the '/etc/system' file for a reference to the c2audit kernel module
as in the following example:

            $ grep c2audit /etc/system
            set c2audit:audit_load = 1 

3. OpenSolaris distributions may include additional bug fixes above
and beyond the build from which it was derived. To determine the
base build of OpenSolaris, the following command can be used:

            $ uname -v
            snv_86

3. Symptoms

If the system panics due to this issue an error message will be generated
which looks similar to the following:

	panic[cpu0]/thread=300018a26a0: BAD TRAP: type=31 rp=2a10033b820 addr=0
	mmu_fsr=0 occurred in module "unix" due to a NULL pointer dereference

and the stack backtrace will reference audit_setfsat_path() after an earlier call to one
of the extended attribute (fsattr(5)) functions like fchownat(2) in the following example:

	die()
	trap()
	ktl0()
   	audit_setfsat_path()
   	[...]
   	fchownat()

4. Workaround

To prevent this issue from occurring Solaris Auditing can be disabled (see bsmunconv(1M)).

5. Resolution

This issue is addressed in the following releases:

SPARC Platform

• Solaris 9 with patch 122300-39 or later
• Solaris 10 with patch 140921-01 or later
• OpenSolaris based upon builds snv_121 or later
  

x86 Platform

• Solaris 9 with patch 122301-39 or later
• Solaris 10 with patch 140922-01 or later
• OpenSolaris based upon builds snv_121 or later
  

For more information on Security Sun Alerts, see Technical Instruction ID 213557
http://sunsolve.sun.com/search/document.do?assetkey=1-61-213557-1

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