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[IBM] Schwachstelle im IBM AIX lpd Kommando
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Liebe Kolleginnen und Kollegen,
soeben erreichte uns nachfolgende Warnung des IBM Managed Security
Services. Wir geben diese Informationen unveraendert an Sie weiter.
Buffer Overflow im IBM AIX lpd Kommando
Im SetUID lpd Kommando in IBM AIX Version 5.2 und 5.3 kann ein Buffer
Overflow ausgeloest werden. Ein lokaler Angreifer in der Gruppe printq
kann diese Schwachstelle ausnutzen, um beliebige Befehle mit
root-Rechten ausfuehren.
Betroffen sind die folgenden Software Pakete und Plattformen:
Fileset bos.rte.printers Version 5.2.0.85 - 5.2.0.105 ohne APAR IY98560
Fileset bos.rte.printers Version 5.3.0.40 - 5.3.0.60 ohne APAR IY98339
IBM AIX 5.2, 5.3
Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.
Hersteller Advisory:
http://www14.software.ibm.com/webapp/set2/subscriptions/ijhifoeblist?mode=1
(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.
Mit freundlichen Gruessen,
Klaus Moeller, DFN-CERT
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IBM SECURITY ADVISORY
First Issued: Tue Jul 24 18:09:11 CDT 2007
===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: AIX lpd Buffer Overflow Vulnerability
PLATFORMS: AIX 5.2, 5.3
SOLUTION: Apply the APAR, interim fix or workaround as described
below.
THREAT: An attacker may run arbitrary code as root privileges.
CERT VU Number: n/a
CVE Number: n/a
===============================================================================
DETAILED INFORMATION
I. OVERVIEW
The 'lpd' command offers an interface to the remote print daemon (lpd).
II. DESCRIPTION
A buffer overflow vulnerability exists in the 'lpd' command which may allow
members of the printq group execute arbitrary code as root.
III. IMPACT
A local member of the printq may execute arbitrary code with root
privileges.
IV. PLATFORM VULNERABILITY ASSESSMENT
To determine if your system is vulnerable, run the following command:
# lslpp -l | grep bos.rte.printers
The following filesets are vulnerable:
AIX Level Lower Level Upper Level
-------------------------------------------------
5.2.0 5.2.0.85 5.2.0.105
5.3.0 5.3.0.40 5.3.0.60
V. SOLUTIONS
A. APARS
IBM provides the following fixes:
AIX Level APAR number Availability
--------------------------------------------------------------------
5.2.0 IY98560 6/8/2007 (available)
5.3.0 IY98339 6/8/2007 (available)
AIX Version 5 APARs can be downloaded from:
http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html
NOTE: Affected customers are urged to upgrade to the latest applicable
Technology Level and Service Pack.
B. INTERIM FIXES
Interim fixes are available. The interim fix can be downloaded via
ftp from:
ftp://aix.software.ibm.com/aix/efixes/security/lpd_ifix.tar.Z
This is a compressed tarball containing this advisory, interim fix
packages and PGP signatures for each package. The interim fixes below
include prerequisite checking. This will enforce the correct mapping
between the fixes and AIX Technology Levels.
AIX Release & Technology Level Interim fix
---------------------------------------------------------------
5200-08 IY98560_08.070724.epkg.Z
5200-09 IY98560_09.070724.epkg.Z
5200-10 IY98560_10.070724.epkg.Z
5300-04 IY98339_04.070724.epkg.Z
5300-05 IY98339_05.070724.epkg.Z
5300-06 IY98339_06.070724.epkg.Z
IMPORTANT: If possible, it is recommended that a mksysb backup of the
system be created. Verify it is both bootable and readable before
proceeding.
These interim fixes have not been fully regression tested; thus, IBM
does not warrant the fully correct functionality of the interim fix.
Customers install the interim fix and operate the modified version of
AIX at their own risk.
Verify you have retrieved the fixes intact:
The interim fixes below are named by using the technology level
corresponding to the release that the fix applies to. The checksums
below were generated using the "sum" and "md5sum" commands and are as
follows:
Filename sum md5sum
----------------------------------------------------------------------
IY98560_08.070724.epkg.Z 12757 77 7e1b951bc46d5294bf4a2001b2250c21
IY98560_09.070724.epkg.Z 64524 76 cfaa4502159825780678df5de0c084c6
IY98560_10.070724.epkg.Z 34514 75 edc31f4b258285bc4feea841d66da3d7
IY98339_04.070724.epkg.Z 01432 77 553ca3a541c28c65b23e99730b37e086
IY98339_05.070724.epkg.Z 57125 76 dd5742c0d70c556fa3ed15d8a2d9c898
IY98339_06.070724.epkg.Z 09692 77 39955f5773484160066243087561bd4d
These sums should match exactly. The PGP signatures in the
compressed tarball and on this advisory can also be used to verify
the integrity of the various files they correspond to. If the sums
or signatures cannot be confirmed, double check the command results
and the download site address. If those are OK, contact IBM AIX
Security at security-alert@xxxxxxxxxxxxxx and describe the
discrepancy.
C. INTERIM FIX INSTALLATION
These packages use the new Interim Fix Management Solution to install
and manage interim fixes. More information can be found at:
http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html
To preview an epkg interim fix installation execute the following
command:
# emgr -e ipkg_name -p # where ipkg_name is the name of the
# interim fix package being previewed.
To install an epkg interim fix package, execute the following command:
# emgr -e ipkg_name -X # where ipkg_name is the name of the
# interim fix package being installed.
The "X" flag will expand any filesystems if required.
VI. WORKAROUNDS
A. OPTION 1
Customers running AIX 5.3.0 TL06 may install the bos.rte.security
fileset and take advantage of the 'fpm' command to disable the setuid
capabilities of 'capture'. The 'capture' command is disabled in the
high level database.
NOTE: This will disable functionality of the command for all users
except root.
NOTE: Some workarounds may disable function for some users.
VII. OBTAINING FIXES
AIX Version 5 APARs can be downloaded from:
http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html
Security related Interim Fixes can be downloaded from:
ftp://aix.software.ibm.com/aix/efixes/security
VII. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email, please
visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd
Comments regarding the content of this announcement can be directed to:
security-alert@xxxxxxxxxxxxxx
To request the PGP public key that can be used to communicate
securely with the AIX Security Team send email to
security-alert@xxxxxxxxxxxxxx with a subject of "get key". The key
can also be downloaded from a PGP Public Key Server. The key id is
0x4265D862.
Please contact your local IBM AIX support center for any assistance.
eServer is a trademark of International Business Machines Corporation.
IBM, AIX and pSeries are registered trademarks of International Business
Machines Corporation. All other trademarks are property of their
respective holders.
VIII. ACKNOWLEDGMENTS
This vulnerability was discovered internal to IBM as part of its
commitment to securing the AIX operating system.
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- --
Dipl. Inform. Klaus Moeller (CSIRT)
DFN-CERT Services GmbH, https://www.dfn-cert.de, Phone +49 40 808077-555
Sitz / Register: Hamburg, AG Hamburg, HRB 88805, Ust-IdNr.: DE 232129737
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