Overview

The XFS file system on SGI systems allows anonymous remote users to call xfs-related RPC functions.

Description

XFS is a 64-bit compliant journaling file system. The XFS journaling filesystem daemon (rpc.xfsmd) on SGI systems uses the default AUTH_UNIX authentication mechanism (a client-based security option) for its RPC service. This means the rpc.xfsmd daemon trusts that the remote system calling its RPC interface has already authenticated the remote client process via standard UNIX user id mechanisms (i.e., if a daemon only allows UID 0 [root] access to its RPC interface, it trusts remote RPC clients to be running with UID 0 [root] privileges).

As a result, any remote system able to forge UID 0 in its RPC call to vulnerable SGI rpc.xfsmd daemons can bypass the RPC authentication mechanism altogether. When exploited in conjunction with VU#195371, this could lead to the execution of arbitrary commands on vulnerable SGI systems.

---

Impact

A remote attacker can bypass the default AUTH_UNIX authentication mechanism for this RPC service, allowing anonymous RPC function calls

---

Solution

SGI has reported they will not be providing a patch for this issue. Sites are strongly urged to disable the XFS daemon and related subsystems as soon as their service requirements permit.

---

Per SGI Security Advisory 20020606-02-I:

There is no effective workaround available for these problems. SGI recommends either disabling or uninstalling the product.
To disable the product from running, perform the following steps:
` # killall /usr/etc/xfsmd

vi /etc/inetd.conf

Look for a line in inetd.conf that looks like this:
sgi_xfsmd/1 stream rpc/tcp wait root ?/usr/etc/xfsmd xfsmd
…and comment it out by putting a “#” at the beginning of the line:
#sgi_xfsmd/1 stream rpc/tcp wait root ?/usr/etc/xfsmd xfsmd
…or simply remove the line from the file.
# killall -HUP inetd
To remove the product from the system, perform the following command:
# versions remove eoe.sw.xfsmserv`

---

Vendor Information

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SGI __ Affected

Updated: August 08, 2002

Status

Affected

Vendor Statement

Please see <ftp://patches.sgi.com/support/free/security/advisories/20020606-01-I&gt; and <ftp://patches.sgi.com/support/free/security/advisories/20020606-02-I&gt;

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

-----BEGIN PGP SIGNED MESSAGE-----

_____________________________________________________________________________
SGI Security Advisory
` Title: xfsmd vulnerability
Number: 20020605-01-I
Date: June 20, 2002
Reference: CAN-2002-0359

---

- -----------------------

• — Issue Specifics —

---

It’s been reported that the /usr/etc/xfsmd daemon has security
vulnerabilities which can lead to a remote root exploit.
See <http://www.lsd-pl.net/> for more information.
SGI has investigated the issue and recommends the following steps for
neutralizing the exposure. It is HIGHLY RECOMMENDED that these measures be
implemented on ALL vulnerable SGI systems.
Since the xfsmserv product is being retired, SGI has no plans to fix the
xfsmd security issue.
`

`- --------------

• — Impact —

---

The /usr/etc/xfsmd daemon is part of the optional eoe.sw.xfsmserv package,
and is not installed by default on IRIX 6.5 systems. but if it is installed,
it will run by default.
To determine the version of IRIX you are running, execute the following
command:
# uname -R
That will return a result similar to the following:
# 6.5 6.5.15f
The first number (“6.5”) is the release name, the second (“6.5.15f” in this
77case) is the extended release name. The extended release name is the
“version” we refer to throughout this document.
To see if xfsmd is installed, execute the following command:
# versions eoe.sw.xfsmserv
I = Installed, R = Removed
Name Date Description
I eoe 08/28/2001 IRIX Execution Environment, 6.5.13f
I eoe.sw 08/28/2001 IRIX Execution Environment Software
I eoe.sw.xfsmserv 08/28/2001 XFSM Server Software
If the output resembles the above, then the package is installed and the
system is vulnerable.
This vulnerability was assigned the following CVE:
<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0359>
`

`- ----------------------------

• — Temporary Workaround —

---

There is no effective workaround available for these problems.
SGI recommends either disabling or uninstalling the product.
To disable the product from running, perform the following steps:
# killall /usr/etc/xfsmd

vi /etc/inetd.conf

Look for a line in inetd.conf that looks like this:
sgi_xfsmd/1 stream rpc/tcp wait root ?/usr/etc/xfsmd xfsmd
…and comment it out by putting a “#” at the beginning of the line:
#sgi_xfsmd/1 stream rpc/tcp wait root ?/usr/etc/xfsmd xfsmd
…or simply remove the line from the file.
# killall -HUP inetd
To remove the product from the system, perform the following command:
# versions remove eoe.sw.xfsmserv
`

`- ----------------

• — Solution —

---

SGI will not be providing a fix or patches for this issue, as the product is
being retired. Our recommendation is to follow the instructions in the
Temporary Workaround section above.
OS Version Vulnerable? Patch # Other Actions

---

IRIX 3.x unknown Note 1
IRIX 4.x unknown Note 1
IRIX 5.x unknown Note 1
IRIX 6.0.x unknown Note 1
IRIX 6.1 unknown Note 1
IRIX 6.2 unknown Note 1
IRIX 6.3 unknown Note 1
IRIX 6.4 unknown Note 1
IRIX 6.5 yes Notes 2 & 3
IRIX 6.5.1 yes Notes 2 & 3
IRIX 6.5.2 yes Notes 2 & 3
IRIX 6.5.3 yes Notes 2 & 3
IRIX 6.5.4 yes Notes 2 & 3
IRIX 6.5.5 yes Notes 2 & 3
IRIX 6.5.6 yes Notes 2 & 3
IRIX 6.5.7 yes Notes 2 & 3
IRIX 6.5.8 yes Notes 2 & 3
IRIX 6.5.9 yes Notes 2 & 3
IRIX 6.5.10 yes Notes 2 & 3
IRIX 6.5.11 yes Notes 2 & 3
IRIX 6.5.12 yes Notes 2 & 3
IRIX 6.5.13 yes Notes 2 & 3
IRIX 6.5.14 yes Notes 2 & 3
IRIX 6.5.15 yes Notes 2 & 3
IRIX 6.5.16 yes Notes 2 & 3
NOTES
1) This version of the IRIX operating has been retired. Upgrade to an
actively supported IRIX operating system. See
<http://support.sgi.com/irix/news/index.html#policy> for more
information.
2) If you have not received an IRIX 6.5.X CD for IRIX 6.5, contact your
SGI Support Provider or URL: <http://support.sgi.com/irix/swupdates/>
3) Disable or uninstall the product.
`

`- ------------------------

• — Acknowledgments ----

---

SGI wishes to thank The Last Stages of Delirium Research Group at
<http://www.lsd-pl.net/> for their assistance in this matter.
`

`- -------------

• — Links —

---

SGI Security Advisories can be found at:
<http://www.sgi.com/support/security/> and
<ftp://patches.sgi.com/support/free/security/advisories/>
SGI Security Patches can be found at:
<http://www.sgi.com/support/security/> and
<ftp://patches.sgi.com/support/free/security/patches/>
SGI patches for IRIX can be found at the following patch servers:
<http://support.sgi.com/irix/> and <ftp://patches.sgi.com/>
SGI freeware updates for IRIX can be found at:
<http://freeware.sgi.com/>
SGI fixes for SGI open sourced code can be found on:
<http://oss.sgi.com/projects/>
SGI patches and RPMs for Linux can be found at:
<http://support.sgi.com/linux/> or
<http://oss.sgi.com/projects/sgilinux-combined/download/security-fixes/>
SGI patches for Windows NT or 2000 can be found at:
<http://support.sgi.com/nt/>
IRIX 5.2-6.4 Recommended/Required Patch Sets can be found at:
<http://support.sgi.com/irix/> and <ftp://patches.sgi.com/support/patchset/>
IRIX 6.5 Maintenance Release Streams can be found at:
<http://support.sgi.com/colls/patches/tools/relstream/index.html>
IRIX 6.5 Software Update CDs can be obtained from:
<http://support.sgi.com/irix/swupdates/>
The primary SGI anonymous FTP site for security advisories and patches is
patches.sgi.com (216.32.174.211). Security advisories and patches are
located under the URL <ftp://patches.sgi.com/support/free/security/>
For security and patch management reasons, ftp.sgi.com (mirrors
patches.sgi.com security FTP repository) lags behind and does not do a
real-time update.
`

`- -----------------------------------------

• — SGI Security Information/Contacts —

---

If there are questions about this document, email can be sent to
[email protected].
------oOo------
SGI provides security information and patches for use by the entire SGI
community. This information is freely available to any person needing the
information and is available via anonymous FTP and the Web.
The primary SGI anonymous FTP site for security advisories and patches is
patches.sgi.com (216.32.174.211). Security advisories and patches are
located under the URL <ftp://patches.sgi.com/support/free/security/>
The SGI Security Headquarters Web page is accessible at the URL:
<http://www.sgi.com/support/security/>
For issues with the patches on the FTP sites, email can be sent to
[email protected].
For assistance obtaining or working with security patches, please
contact your SGI support provider.
------oOo------
SGI provides a free security mailing list service called wiretap and
encourages interested parties to self-subscribe to receive (via email) all
SGI Security Advisories when they are released. Subscribing to the mailing
list can be done via the Web
(<http://www.sgi.com/support/security/wiretap.html>) or by sending email to
SGI as outlined below.
% mail [email protected]
subscribe wiretap <YourEmailAddress>
end
^d
In the example above, <YourEmailAddress> is the email address that you wish
the mailing list information sent to. The word end must be on a separate
line to indicate the end of the body of the message. The control-d (^d) is
used to indicate to the mail program that you are finished composing the
mail message.
`

------oOo------
SGI provides a comprehensive customer World Wide Web site. This site is located at ``<http://www.sgi.com/support/security/>`` .
------oOo------
If there are general security questions on SGI systems, email can be sent to [email protected].
For reporting *NEW* SGI security issues, email can be sent to [email protected] or contact your SGI support provider. A support contract is not required for submitting a security report.
______________________________________________________________________________ This information is provided freely to all interested parties and may be redistributed provided that it is not altered in any way, SGI is appropriately credited and the document retains and includes its valid PGP signature.

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-----BEGIN PGP SIGNED MESSAGE-----

_____________________________________________________________________________

SGI Security Advisory

Title: xfsmd vulnerability
Number: 20020606-02-I
Date: June 24, 2002
Reference: CAN-2002-0359
_____________________________________________________________________________

- --------------
- --- Update ---
- --------------

Fixed incorrect advisory number in the header.

- -----------------------
- --- Issue Specifics ---
- -----------------------

It's been reported that the /usr/etc/xfsmd daemon has security
vulnerabilities which can lead to a remote root exploit.

See <http://www.lsd-pl.net/> for more information.

SGI has investigated the issue and recommends the following steps for
neutralizing the exposure. It is HIGHLY RECOMMENDED that these measures be
implemented on ALL vulnerable SGI systems.

Since the xfsmserv product is being retired, SGI has no plans to fix the
xfsmd security issue.

- --------------
- --- Impact ---
- --------------

The /usr/etc/xfsmd daemon is part of the optional eoe.sw.xfsmserv package,
and is not installed by default on IRIX 6.5 systems. but if it is installed,
it will run by default.

To determine the version of IRIX you are running, execute the following
command:

# uname -R

That will return a result similar to the following:

# 6.5 6.5.15f

The first number ("6.5") is the release name, the second ("6.5.15f" in this
case) is the extended release name. The extended release name is the
"version" we refer to throughout this document.

To see if xfsmd is installed, execute the following command:

# versions eoe.sw.xfsmserv
I = Installed, R = Removed

Name Date Description

I eoe 08/28/2001 IRIX Execution Environment, 6.5.13f
I eoe.sw 08/28/2001 IRIX Execution Environment Software
I eoe.sw.xfsmserv 08/28/2001 XFSM Server Software

If the output resembles the above, then the package is installed and the
system is vulnerable.

This vulnerability was assigned the following CVE:
<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0359>

- ----------------------------
- --- Temporary Workaround ---
- ----------------------------

There is no effective workaround available for these problems.
SGI recommends either disabling or uninstalling the product.

To disable the product from running, perform the following steps:

# killall /usr/etc/xfsmd
# vi /etc/inetd.conf

Look for a line in inetd.conf that looks like this:

sgi_xfsmd/1 stream rpc/tcp wait root ?/usr/etc/xfsmd xfsmd

...and comment it out by putting a "#" at the beginning of the line:

#sgi_xfsmd/1 stream rpc/tcp wait root ?/usr/etc/xfsmd xfsmd

...or simply remove the line from the file.

# killall -HUP inetd

To remove the product from the system, perform the following command:

# versions remove eoe.sw.xfsmserv

- ----------------
- --- Solution ---
- ----------------

SGI will not be providing a fix or patches for this issue, as the product is
being retired. Our recommendation is to follow the instructions in the
Temporary Workaround section above.

OS Version Vulnerable? Patch # Other Actions
---------- ----------- ------- -------------
IRIX 3.x unknown Note 1
IRIX 4.x unknown Note 1
IRIX 5.x unknown Note 1
IRIX 6.0.x unknown Note 1
IRIX 6.1 unknown Note 1
IRIX 6.2 unknown Note 1
IRIX 6.3 unknown Note 1
IRIX 6.4 unknown Note 1
IRIX 6.5 yes Notes 2 & 3
IRIX 6.5.1 yes Notes 2 & 3
IRIX 6.5.2 yes Notes 2 & 3
IRIX 6.5.3 yes Notes 2 & 3
IRIX 6.5.4 yes Notes 2 & 3
IRIX 6.5.5 yes Notes 2 & 3
IRIX 6.5.6 yes Notes 2 & 3
IRIX 6.5.7 yes Notes 2 & 3
IRIX 6.5.8 yes Notes 2 & 3
IRIX 6.5.9 yes Notes 2 & 3
IRIX 6.5.10 yes Notes 2 & 3
IRIX 6.5.11 yes Notes 2 & 3
IRIX 6.5.12 yes Notes 2 & 3
IRIX 6.5.13 yes Notes 2 & 3
IRIX 6.5.14 yes Notes 2 & 3
IRIX 6.5.15 yes Notes 2 & 3
IRIX 6.5.16 yes Notes 2 & 3

NOTES

1) This version of the IRIX operating has been retired. Upgrade to an
actively supported IRIX operating system. See
<http://support.sgi.com/irix/news/index.html#policy> for more
information.

2) If you have not received an IRIX 6.5.X CD for IRIX 6.5, contact your
SGI Support Provider or URL: <http://support.sgi.com/irix/swupdates/>

3) Disable or uninstall the product.

- ------------------------
- --- Acknowledgments ----
- ------------------------

SGI wishes to thank The Last Stages of Delirium Research Group at
<http://www.lsd-pl.net/> for their assistance in this matter.

- -------------
- --- Links ---
- -------------

SGI Security Advisories can be found at:
<http://www.sgi.com/support/security/> and
<ftp://patches.sgi.com/support/free/security/advisories/>

SGI Security Patches can be found at:
<http://www.sgi.com/support/security/> and
<ftp://patches.sgi.com/support/free/security/patches/>

SGI patches for IRIX can be found at the following patch servers:
<http://support.sgi.com/irix/> and <ftp://patches.sgi.com/>

SGI freeware updates for IRIX can be found at:
<http://freeware.sgi.com/>

SGI fixes for SGI open sourced code can be found on:
<http://oss.sgi.com/projects/>

SGI patches and RPMs for Linux can be found at:
<http://support.sgi.com/linux/> or
<http://oss.sgi.com/projects/sgilinux-combined/download/security-fixes/>

SGI patches for Windows NT or 2000 can be found at:
<http://support.sgi.com/nt/>

IRIX 5.2-6.4 Recommended/Required Patch Sets can be found at:
<http://support.sgi.com/irix/> and <ftp://patches.sgi.com/support/patchset/>

IRIX 6.5 Maintenance Release Streams can be found at:
<http://support.sgi.com/colls/patches/tools/relstream/index.html>

IRIX 6.5 Software Update CDs can be obtained from:
<http://support.sgi.com/irix/swupdates/>

The primary SGI anonymous FTP site for security advisories and patches is
patches.sgi.com (216.32.174.211). Security advisories and patches are
located under the URL <ftp://patches.sgi.com/support/free/security/>

For security and patch management reasons, ftp.sgi.com (mirrors
patches.sgi.com security FTP repository) lags behind and does not do a
real-time update.

- -----------------------------------------
- --- SGI Security Information/Contacts ---
- -----------------------------------------

If there are questions about this document, email can be sent to
[email protected].

------oOo------

SGI provides security information and patches for use by the entire SGI
community. This information is freely available to any person needing the
information and is available via anonymous FTP and the Web.

The primary SGI anonymous FTP site for security advisories and patches is
patches.sgi.com (216.32.174.211). Security advisories and patches are
located under the URL <ftp://patches.sgi.com/support/free/security/>

The SGI Security Headquarters Web page is accessible at the URL:
<http://www.sgi.com/support/security/>

For issues with the patches on the FTP sites, email can be sent to
[email protected].

For assistance obtaining or working with security patches, please
contact your SGI support provider.

------oOo------

SGI provides a free security mailing list service called wiretap and
encourages interested parties to self-subscribe to receive (via email) all
SGI Security Advisories when they are released. Subscribing to the mailing
list can be done via the Web
(<http://www.sgi.com/support/security/wiretap.html>) or by sending email to
SGI as outlined below.

% mail [email protected]
subscribe wiretap <YourEmailAddress>
end
^d

In the example above, <YourEmailAddress> is the email address that you wish
the mailing list information sent to. The word end must be on a separate
line to indicate the end of the body of the message. The control-d (^d) is
used to indicate to the mail program that you are finished composing the
mail message.

------oOo------

SGI provides a comprehensive customer World Wide Web site. This site is
located at <http://www.sgi.com/support/security/> .

------oOo------

If there are general security questions on SGI systems, email can be sent to
[email protected].

For reporting *NEW* SGI security issues, email can be sent to
[email protected] or contact your SGI support provider. A support
contract is not required for submitting a security report.

______________________________________________________________________________
This information is provided freely to all interested parties
and may be redistributed provided that it is not altered in any
way, SGI is appropriately credited and the document retains and
includes its valid PGP signature.

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If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23521147 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <ftp://patches.sgi.com/support/free/security/advisories/20020606-02-I&gt;
• <http://www.securityfocus.com/bid/5075&gt;
• <http://www.iss.net/security_center/static/9401.php&gt;
• <http://oss.sgi.com/projects/xfs/&gt;
• <http://www.sgi.com/software/xfs/&gt;

Acknowledgements

Last Stage of Delirium has reported this vulnerability in several public forums.

This document was written by Jeffrey S. Havrilla.

Other Information

CVE IDs:	CVE-2002-0359
Severity Metric:	10.53 Date Public: