CERT/CC Vulnerability Note VU#516825

Overview

The XDR library from Sun Microsystems is a widely used implementation for RPC services. Although the library was originally distributed by Sun Microsystems, multiple vendors have included the vulnerable code in their own implementations. Some implementations of standard functions in this API may contain an integer overflow.

Description

The XDR (external data representation) libraries are used to provide platform-independent methods for sending data from one system process to another, typically over a network connection. Such routines are commonly used in remote procedure call (RPC) implementations to provide transparency to application programmers who need to use common interfaces to interact with many different types of systems.

Some memory allocation routines in the XDR library provided by Sun Microsystems contain an integer overflow that can lead to improperly sized dynamic memory allocation. The length of the allocated buffer is interpreted as a signed integer, whereas the callers interpret the length as an unsigned integer. The xdrmem_getbytes() function is one example of where the flaw may occur. Subsequent problems like buffer overflows may result, depending on how and where the vulnerable xdrmem_getbytes() function is used. Other functions in the xdrmem_*() family may suffer from an identical error.

Researchers at eEye Digital Security discovered this vulnerability and have also published an advisory. This vulnerability is similar to, but distinct from, VU#192995.

Impact

Because Sun RPC-derived XDR libraries are used by a variety of vendors in a variety of applications, this defect may lead to a number of differing security problems. Exploiting this vulnerability will lead to denial of service, execution of arbitrary code, or the disclosure of sensitive information. Furthermore, because RPC services often run as root on affected systems, this vulnerability may be leveraged to gain remote root access on vulnerable systems.

Solution

Apply a patch from the vendor

Several vendors of relevant or derived implementations have released patches to address this vulnerability; please see the vendor section of this document for further details.

Workarounds

Disable access to vulnerable services or applications

Until patches are available and can be applied, you may wish to disable access to services or applications compiled with the vulnerable xdrmem_*() functions. As a best practice, the CERT/CC recommends disabling all services that are not explicitly required.

Vendor Information

516825

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Compaq Computer Corporation Affected

Conectiva Affected

Debian Affected

FreeBSD Affected

GNU glibc Affected

Gentoo Linux Affected

Guardian Digital Inc. Affected

Hewlett-Packard Company Affected

Notified: December 11, 2002 Updated: February 11, 2004

Status

Affected

Vendor Statement

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1

----------------------------------------------------------------- **REVISED 10** Source: HEWLETT-PACKARD COMPANY SECURITY BULLETIN: HPSBUX0303-252 Originally issued: 19 March 2003 Last revised: 11 January 2004 SSRT2439 Rev.10 xdrmem_getbytes() -----------------------------------------------------------------

NOTICE: There are no restrictions for distribution of this Bulletin provided that it remains complete and intact.

The information in the following Security Bulletin should be acted upon as soon as possible. Hewlett-Packard Company will not be liable for any consequences to any customer resulting from customer's failure to fully implement instructions in this Security Bulletin as soon as possible.

----------------------------------------------------------------- PROBLEM: Potential buffer overflow in xdrmem_getbytes() and related functions.

IMPACT: Potential unauthorized access, denial of service.

PLATFORM: HP-UX B.10.20, B.11.00, B.11.04, B.11.11, and B.11.22

SOLUTION: Install the appropriate patches.

B.10.20 - PHCO_26158 B.11.00 - PHNE_28982 B.11.00 - PHCO_28480 B.11.11 - PHNE_28983 B.11.11 - PHCO_28481 --> B.11.22 - PHNE_29449

MANUAL ACTIONS: Yes - NonUpdate B.11.04, B.11.22: Download and install the appropriate files.

AVAILABILITY: Patches are available now for all except B.11.04 and B.11.22 (libc.1).

CHANGE SUMMARY: Rev.01 - Corrected instructions for replacing libc.1 on 11.00 and 11.11. Added CERT CA-2003-10 reference. Rev.02 - Corrected instructions 10.20 Rev.03 - Patches are available for 11.00 and 11.11 libc.1 must still be manually installed for 11.00 and 11.11 Rev.04 - Corrected 11.00 and 11.11 patch information. Rev.05 - Added note about general release patches Rev.06 - Added PHCO_26158. Added AFFECTED VERSIONS section. Rev.07 - Added PHCO_28982 and PHCO_28983. Rev.08 - Corrected patch names. PHCO_28982 should be PHNE_28982. PHCO_28983 should be PHNE_28983. Rev.09 - Added PHCO_28480 and PHCO_28481. Rev.10 - Added PHNE_29449. -----------------------------------------------------------------
A. Background

There are potential buffer overflows in xdrmem_getbytes() and related functions.

This issue has been reported by CERT/CC in advisory CA-2003-10.

HP Tru64 UNIX/TruCluster Servers: The following potential security vulnerability has been identified or reported in the HP Tru64 UNIX operating system that may result in unauthorized Privileged Access or a Denial of Service (DoS). This potential vulnerability may be in the form of Local and Remote security domain risks.

Cross reference: SSRT2322, SSRT2384, SSRT2341, SSRT2439, SSRT2412

Not Impacted:

HP NonStop Servers HP OpenVMS

**REVISED 10** AFFECTED VERSIONS

The following is a list by HP-UX revision of affected filesets and the fileset revision or patch containing the fix. To determine if a system has an affected version, search the output of "swlist -a revision -l fileset" for an affected fileset, then determine if a fixed revision or the applicable patch is installed.

HP-UX B.11.22 ============= NFS.NFS-64SLIB NFS.NFS-SHLIBS --> fix: PHNE_29449 or subsequent OS-Core.CORE2-SHLIBS fix: libc.1

HP-UX B.11.11 ============= NFS.NFS-64SLIB NFS.NFS-SHLIBS fix: PHNE_28983 or subsequent OS-Core.CORE-SHLIBS fix: PHCO_28481 or subsequent

HP-UX B.11.04 ============= NFS.NFS-64SLIB fix: libnsl.1.64_11.00, libnsl.a.64_11.00 NFS.NFS-SHLIBS fix: libnsl.1.32_11.00, libnsl.a.32_11.00 OS-Core.CORE-SHLIBS fix: libc.1

HP-UX B.11.00 ============= NFS.NFS-64SLIB NFS.NFS-SHLIBS fix: PHNE_28982 or subsequent OS-Core.CORE-SHLIBS fix: PHCO_28480 or subsequent

HP-UX B.10.20 ============= OS-Core.CORE-SHLIBS fix: PHCO_26158 or subsequent

END AFFECTED VERSIONS

B. Recommended solution

**REVISED 10** Note: If the preliminary patches, PHNE_28929.depot or PHNE_28930.depot have been installed, they must be removed with swremove before installing the general release patches PHNE_28982 (11.00) or PHNE_28983 (11.11) or subsequent.

Remove the preliminary patches with swremove if they are on the system:

PHNE_28929.depot #B.11.00 PHNE_28930.depot #B.11.11

Install the appropriate patches.

B.10.20 - PHCO_26158 B.11.00 - PHNE_28982 B.11.00 - PHCO_28480 B.11.11 - PHNE_28983 B.11.11 - PHCO_28481 --> B.11.22 - PHNE_29449

--> In addition download and install the appropriate --> library files for B.11.04 and B.11.22 as described --> below.

System: hprc.external.hp.com (192.170.19.51) Login: xdr2 Password: xdr2

Browser ftp access:

ftp://xdr2:xdr2@hprc.external.hp.com/ or ftp://xdr2:xdr2@192.170.19.51/

Note: There is an ftp defect in IE5 that may result in a browser hang. To work around this: Select Tools -> Internet Options -> Advanced Un-check the option: [ ] Enable folder view for FTP sites

If you wish to verify the md5 sum please refer to:

HPSBUX9408-016 Patch sums and the MD5 program

Download the appropriate files and unpack with gunzip:

libc.1.gz # B.11.04, B.11.22 libnsl.1.32_11.00.gz # B.11.04 libnsl.a.32_11.00.gz # B.11.04 libnsl.1.64_11.00.gz # B.11.04 libnsl.a.64_11.00.gz # B.11.04

Verify the cksum or md5.

If you wish to verify the md5 sum please refer to:

HPSBUX9408-016 Patch sums and the MD5 program

cksum: 3108550729 1867776 libc.1 2543748420 679936 libnsl.1.32_11.00 3883898582 652664 libnsl.1.64_11.00 2393869471 818268 libnsl.a.32_11.00 205723668 1456024 libnsl.a.64_11.00

MD5 (libc.1) = 118ce482dbb3982b7484ddc434d77a51 MD5 (libnsl.1.32_11.00) = a6bbfcae4a7044b0d1e9aece871c126e MD5 (libnsl.1.64_11.00) = b3c76866d75a4216be7787f219c051df MD5 (libnsl.a.32_11.00) = 1c0aea725173673eb1c8e9410180096c MD5 (libnsl.a.64_11.00) = 06c8fd367c7620a017e9bb2e7df3ec7d

For B.11.04 ==================================== #DIR=[path to new files] #cd /usr/lib

#cp $DIR/libnsl.1.32_11.00 libnsl.1.new #cp$ DIR/libnsl.a.32_11.00 libnsl.a.new #cp $DIR/libc.1 libc.1.new

#chmod 555 libnsl.1.new #chmod 444 libnsl.a.new #chmod 555 libc.1.new

#chown bin:bin libnsl.1.new #chown bin:bin libnsl.a.new #chown bin:bin libc.1.new

#mv libnsl.1 libnsl.1.orig #mv libnsl.a libnsl.a.orig #mv libc.1 libc.1.orig

#mv libnsl.1.new libnsl.1 #mv libnsl.a.new libnsl.a #mv libc.1.new libc.1

#cd /usr/lib/pa20_64

#cp $DIR/libnsl.1.64_11.00 libnsl.1.new #cp$ DIR/libnsl.a.64_11.00 libnsl.a.new

#chmod 555 libnsl.1.new #chmod 444 libnsl.a.new

#chown bin:bin libnsl.1.new #chown bin:bin libnsl.a.new

#mv libnsl.1 libnsl.1.orig #mv libnsl.a libnsl.a.orig

#mv libnsl.1.new libnsl.1 #mv libnsl.a.new libnsl.a

After this, any applications that use libnsl.1 must be restarted. Any applications that use libnsl.a must be relinked and restarted. Any applications that use libc.1 must be restarted.

Rebooting is the recommended way to restart the applications using libnsl.1 or libc.1.

For B.11.22 ==================================== --> Install PHNE_29449 or subsequent and:

#DIR=[path to new files] #cd /usr/lib #cp $DIR/libc.1 libc.1.new #chmod 555 libc.1.new #chown bin:bin libc.1.new #mv libc.1 libc.1.orig #mv libc.1.new libc.1

After this, any applications that use libnsl.so.1 must be restarted.

Rebooting is the recommended way to restart the applications using libnsl.1 or libc.1.

C. To subscribe to automatically receive future NEW HP Security Bulletins from the HP IT Resource Center via electronic mail, do the following:

Use your browser to get to the HP IT Resource Center page at:

http://itrc.hp.com

Use the 'Login' tab at the left side of the screen to login using your ID and password. Use your existing login or the "Register" button at the left to create a login, in order to gain access to many areas of the ITRC. Remember to save the User ID assigned to you, and your password.

In the left most frame select "Maintenance and Support".

Under the "Notifications" section (near the bottom of the page), select "Support Information Digests".

To -subscribe- to future HP Security Bulletins or other Technical Digests, click the check box (in the left column) for the appropriate digest and then click the "Update Subscriptions" button at the bottom of the page.

or

To -review- bulletins already released, select the link (in the middle column) for the appropriate digest.

NOTE: Using your itrc account security bulletins can be found here: http://itrc.hp.com/cki/bin/doc.pl/screen=ckiSecurityBulletin

To -gain access- to the Security Patch Matrix, select the link for "The Security Bulletins Archive". (near the bottom of the page) Once in the archive the third link is to the current Security Patch Matrix. Updated daily, this matrix categorizes security patches by platform/OS release, and by bulletin topic. Security Patch Check completely automates the process of reviewing the patch matrix for 11.XX systems. Please note that installing the patches listed in the Security Patch Matrix will completely implement a security bulletin _only_ if the MANUAL ACTIONS field specifies "No."

The Security Patch Check tool can verify that a security bulletin has been implemented on HP-UX 11.XX systems providing that the fix is completely implemented in a patch with no manual actions required. The Security Patch Check tool cannot verify fixes implemented via a product upgrade.

For information on the Security Patch Check tool, see: http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/ displayProductInfo.pl?productNumber=B6834AA

The security patch matrix is also available via anonymous ftp:

ftp://ftp.itrc.hp.com/export/patches/hp-ux_patch_matrix/

On the "Support Information Digest Main" page: click on the "HP Security Bulletin Archive".

The PGP key used to sign this bulletin is available from several PGP Public Key servers. The key identification information is:

2D2A7D59 HP Security Response Team (Security Bulletin signing only) <security-alert@hp.com> Fingerprint = 6002 6019 BFC1 BC62 F079 862E E01F 3AFC 2D2A 7D59

If you have problems locating the key please write to security-alert@hp.com. Please note that this key is for signing bulletins only and is not the key returned by sending 'get key' to security-alert@hp.com.

D. To report new security vulnerabilities, send email to

security-alert@hp.com

Please encrypt any exploit information using the security-alert PGP key, available from your local key server, or by sending a message with a -subject- (not body) of 'get key' (no quotes) to security-alert@hp.com.

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

(c)Copyright 2004 Hewlett-Packard Company Hewlett-Packard Company shall not be liable for technical or editorial errors or omissions contained herein. The information in this document is subject to change without notice. Hewlett-Packard Company and the names of HP products referenced herein are trademarks and/or service marks of Hewlett-Packard Company. Other product and company names mentioned herein may be trademarks and/or service marks of their respective owners.

________________________________________________________________

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Vendor Information

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

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

IBM Affected

MandrakeSoft Affected

MiT Kerberos Development Team Affected

NetBSD Affected

Nortel Networks Affected

Red Hat Inc. Affected

SGI Affected

Slackware Affected

Stonesoft Affected

SuSE Inc. Affected

Sun Microsystems Inc. Affected

The SCO Group (SCO Linux) Affected

The SCO Group (SCO UnixWare) Affected

Trustix Affected

TurboLinux Affected

Wirex Affected

Xerox Corporation Affected

Apple Computer Inc. Not Affected

Hitachi Not Affected

Ingrian Networks Not Affected

NEC Corporation Not Affected

Network Appliance Not Affected

Nokia Not Affected

Top Layer Networks Not Affected

3Com Unknown

AT&T Unknown

Alcatel Unknown

Avaya Unknown

BSDI Unknown

Cisco Systems Inc. Unknown

Computer Associates Unknown

Cray Inc. Unknown

D-Link Systems Unknown

Data General Unknown

F5 Networks Unknown

Foundry Networks Inc. Unknown

Fujitsu Unknown

Heimdal Kerberos Project Unknown

IBM-zSeries Unknown

Intel Unknown

Juniper Networks Unknown

KTH Kerberos Development Team Unknown

Lotus Software Unknown

Lucent Technologies Unknown

Microsoft Corporation Unknown

MontaVista Software Unknown

Multinet Unknown

NeXT Unknown

NetScreen Unknown

Open Group Unknown

OpenAFS Unknown

OpenBSD Unknown

Openwall GNU/*/Linux Unknown

Oracle Corporation Unknown

RSA Security Unknown

Redback Networks Inc. Unknown

Riverstone Networks Unknown

Sequent Unknown

Sony Corporation Unknown

Unisys Unknown

Wind River Systems Inc. Unknown

Xi Graphics Unknown

View all 70 vendors View less vendors

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

Acknowledgements

Thanks to Riley Hassell of eEye Digital Security for reporting this vulnerability.

This document was written by Chad R Dougherty and Jeffrey S Havrilla.

Other Information

CVE IDs:	CVE-2003-0028
CERT Advisory:	CA-2003-10
Severity Metric:	12.02
Date Public:	2003-03-18
Date First Published:	2003-03-19
Date Last Updated:	2004-02-11 16:37 UTC
Document Revision:	33

Software Engineering Institute

CERT Coordination Center

Integer overflow in Sun RPC XDR library routines

Vulnerability Note VU#516825

Overview

Description

Impact

Solution

Vendor Information

Compaq Computer Corporation Affected

Conectiva Affected

Debian Affected

FreeBSD Affected

GNU glibc Affected

Gentoo Linux Affected

Guardian Digital Inc. Affected

Hewlett-Packard Company Affected

IBM Affected

MandrakeSoft Affected

MiT Kerberos Development Team Affected

NetBSD Affected

Nortel Networks Affected

Red Hat Inc. Affected

SGI Affected

Slackware Affected

Stonesoft Affected

SuSE Inc. Affected

Sun Microsystems Inc. Affected

The SCO Group (SCO Linux) Affected

The SCO Group (SCO UnixWare) Affected

Trustix Affected

TurboLinux Affected

Wirex Affected

Xerox Corporation Affected

Apple Computer Inc. Not Affected

Hitachi Not Affected

Ingrian Networks Not Affected

NEC Corporation Not Affected