-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.3131
                  Kernel data leak via ptrace(PT_LWPINFO)
                              7 December 2017

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           kernel
Publisher:         FreeBSD
Operating System:  FreeBSD
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-1086  

Reference:         ESB-2017.2911

Original Bulletin: 
   link: http://www.vuxml.org/freebsd/34a3f9b5-dab3-11e7-b5af-a4badb2f4699.html

- --------------------------BEGIN INCLUDED TEXT--------------------

FreeBSD -- Kernel data leak via ptrace(PT_LWPINFO)

Affected packages

11.1 <= FreeBSD-kernel < 11.1_4

11.0 <= FreeBSD-kernel < 11.0_15

10.4 <= FreeBSD-kernel < 10.4_3

10.3 <= FreeBSD-kernel < 10.3_24

Details

VuXML ID 34a3f9b5-dab3-11e7-b5af-a4badb2f4699

Discovery 2017-11-15

Entry 2017-12-06

Problem Description:

Not all information in the struct ptrace_lwpinfo is relevant for the state of
any thread, and the kernel does not fill the irrelevant bytes or short 
strings. Since the structure filled by the kernel is allocated on the kernel 
stack and copied to userspace, a leak of information of the kernel stack of 
the thread is possible from the debugger.

Impact:

Some bytes from the kernel stack of the thread using ptrace(PT_LWPINFO) call 
can be observed in userspace.

References

CVE Name CVE-2017-1086

FreeBSD Advisory SA-17:08.ptrace

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=4dE9
-----END PGP SIGNATURE-----