Note: This is an archival copy of Security Sun Alert 244026 as previously published on http://sunsolve.sun.com.
Latest version of this security advisory is available from http://support.oracle.com as Sun Alert 1019696.1.
Article ID : 1019696.1
Article Type : Sun Alerts (SURE)
Last reviewed : 2009-02-04
Audience : PUBLIC
Copyright Notice: Copyright © 2010, Oracle Corporation and/or its affiliates.

Security Vulnerability in the Process File System (proc(4)) Relating to Contract File System (contract(4)) Interaction May Lead to a System Panic or Possible Execution of Arbitrary Code by Unprivileged Users

Category
Security

Release Phase
Resolved

Bug Id
6753802

Product
OpenSolaris

Date of Resolved Release
05-Feb-2009

A security vulnerability in the process file system (proc(4)):

1. Impact

A security vulnerability in the process file system (proc(4)) when interacting with the contract(4) file system 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, Ilja van Sprundel from IOActive for bringing this issue to our attention.

This issue is also referenced in the following IOActive advisory:
2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform
  • OpenSolaris based upon builds snv_85 through snv_100
x86 Platform
  • OpenSolaris based upon builds snv_85 through snv_100
Note: Solaris 8, 9, and 10 are not impacted by this issue.
3. Symptoms

If the described issue is exploited to cause a Denial of Service (DoS), the system may panic with a stack strace similar to the following:
    ctmpl_set()
    prctioctl()
    prioctl()
    fop_ioctl()
    ioctl()
    syscall_trap32()
There are no predictable symptoms which would indicate that this issue has been exploited to gain elevated privileges.

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
  • OpenSolaris based upon builds snv_101a or later
x86 Platform
  • OpenSolaris based upon builds snv_101a or later
For more information on Security Sun Alerts, see 1009886.1.

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