[security bulletin] HPSBUX02102 SSRT051078 rev.4 - HP-UX usermod(1M) Local Unauthorized Access.
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SUPPORT COMMUNICATION - SECURITY BULLETIN
Document ID: c00614838
Version: 4
HPSBUX02102 SSRT051078 rev.4 - HP-UX usermod(1M) Local Unauthorized Access.
NOTICE: The information in this Security Bulletin should be acted upon as soon
as possible.
Release Date: 2006-09-05
Last Updated: 2006-09-05
Potential Security Impact: Local unauthorized access to user and system files
and directories.
Source: Hewlett-Packard Company, HP Software Security Response Team
VULNERABILITY SUMMARY
A vulnerability has been identified with certain versions of the HP-UX
usermod(1M) command.
A certain combination of options can result in recursively changing the
ownership of all directories
and files under a user's new home directory. This may result in unauthorized
access to these
directories and files.
References: none
SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.
HP-UX B.11.00, B.11.11, B.11.23
BACKGROUND
The behavior is present in HP-UX B.11.00, B.11.11, and B.11.23. For B.11.11,
the affected version of usermod(1M) is present only in these patches:
PHCO_29269, PHCO_30275, PHCO_32181.
The -d <dir> option of the command usermod(1M) specifies a new home
directory for the login.
Executing a vulnerable version of usermod(1M) in the following manner
# usermod -d <dir> -u <new uid> -m <username>
or
# usermod -d <dir> -g <new or old gid> -m <username>
causes the ownership of all files and directories, including and beneath
directory <dir>
to be recursively changed to <username>.
If the directory <dir> is '/' the system will immediately become inoperable.
If directory <dir> is an existing directory other than '/' the change in
ownership
may not be an issue. If directories or files under directory <dir> were owned
by
an account other than <username>, the affected files or directories may be
subject
to unauthorized access.
AFFECTED VERSIONS
HP-UX B.11.00
============
OS-Core.SYS-ADMIN
action: install PHCO_34763 or subsequent
HP-UX B.11.11
============
OS-Core.SYS-ADMIN
action: install PHCO_33142 or subsequent
HP-UX B.11.23
============
OS-Core.SYS-ADMIN
OS-Core.SYS2-ADMIN
action: install PHCO_34764 or subsequent
END AFFECTED VERSIONS
RESOLUTION
HP has made the following patches available to resolve this issue.
The patches are available from http://itrc.hp.com
HP-UX B.11.00 - PHCO_34763 or subsequent.
HP-UX B.11.11 - PHCO_33142 or subsequent.
HP-UX B.11.23 - PHCO_34764 or subsequent.
All new patches only provide a version of usermod(1M) that does not exhibit the
behavior.
These patches will not detect any ownerships that may have been altered by the
vulnerable
version of usermod(1M). Customers should verify that file/directory ownerships
have not
been altered.
NOTE: The swverify option fix=true can restore altered ownerships for software
installed by swinstall.
- ->MANUAL ACTIONS: No
B.11.00 - install PHCO_34763 or subsequent.
B.11.11 - install PHCO_33142 or subsequent.
B.11.23 - install PHCO_34764 or subsequent.
PRODUCT SPECIFIC INFORMATION
HP-UX Security Patch Check: Security Patch Check revision B.02.00 analyzes all
HP-issued Security Bulletins to provide a subset of recommended actions that
potentially affect a specific HP-UX system. For more information:
http://software.hp.com/portal/swdepot/displayProductInfo.do?productNumber=B6834AA
HISTORY:
Version: 1 (rev.1) 15 March 2006 Initial release
Version: 2 (rev.2) 23 March 2006 clarified command syntax
Version: 3 (rev.3) 28 August 2006 added B.11.00 and B.11.23 patch
Version: 4 (rev.4) 05 September 2006 corrected Manual actions
Support: For further information, contact normal HP Services
support channel.
Report: To report a potential security vulnerability with any HP
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* The Software Product Category that this Security Bulletin
relates to is represented by the 5th and 6th characters of the
Bulletin number in the title:
GN = HP General SW,
MA = HP Management Agents,
MI = Misc. 3rd party SW,
MP = HP MPE/iX,
NS = HP NonStop Servers,
OV = HP OpenVMS,
PI = HP Printing & Imaging,
ST = HP Storage SW,
TL = HP Trusted Linux,
TU = HP Tru64 UNIX,
UX = HP-UX,
VV = HP Virtual Vault
System management and security procedures must be reviewed
frequently to maintain system integrity. HP is continually
reviewing and enhancing the security features of software products
to provide customers with current secure solutions.
"HP is broadly distributing this Security Bulletin in order to
bring to the attention of users of the affected HP products the
important security information contained in this Bulletin. HP
recommends that all users determine the applicability of this
information to their individual situations and take appropriate
action. HP does not warrant that this information is necessarily
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(c)Copyright 2006 Hewlett-Packard Development Company, L.P.
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