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TUCoPS :: HP/UX :: ciach010.txt

HP-UX Security Vulnerabilities





             __________________________________________________________

                       The U.S. Department of Energy
                    Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN

          HP-UX Security Vulnerabilities (passwd, fpkg2swpkg, newgrp)

December 6, 1996 23:00 GMT                                         Number H-10
______________________________________________________________________________
PROBLEM:       Three vulnerabilities have been found in the HP-UX operating
               system: 1) passwd buffer overrun, 2) fpkg2swpkg program, and
               3) newgrp buffer overrun.
PLATFORM:      HP-UX 9.x and HP-UX 10.x
DAMAGE:        Vulnerabilities may allow local users to gain root privileges.
SOLUTION:      Install the proper patches and/or use the workarounds provided
               below.
______________________________________________________________________________
VULNERABILITY  Exploit information involving these vulnerabilities have been
ASSESSMENT:    made publicly available.
______________________________________________________________________________

[ Begin AUSCERT Advisories ]

1. passwd Buffer Overrun Vulnerability

===========================================================================
AA-96.13                        AUSCERT Advisory
                      HP-UX passwd Buffer Overrun Vulnerability
                                28 November 1996

Last Revised: 5 December 1996
		Remove permissions on /sbin/passwd as it is also
		vulnerable.

		Replace wrapper program with pointer to
		overflow_wrapper.c (no change in functionality).

----------------------------------------------------------------------------
AUSCERT has received information that a vulnerability exists in the
passwd(1) program under HP-UX 9.x and HP-UX 10.x.

This vulnerability may allow local users to gain root privileges.

Exploit information involving this vulnerability has been made 
publicly available.

Currently there are no vendor patches available that address this
vulnerability.  AUSCERT recommends that sites take the steps outlined in
section 3 as soon as possible.

This advisory will be updated as more information becomes available.

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

1.  Description

    AUSCERT has received information that a vulnerability exists in the
    HP-UX passwd(1) program.

    This vulnerability is known to affect HP-UX 9.x and 10.x.

    Due to insufficient bounds checking on arguments which are supplied
    by users, it is possible to overwrite the internal stack space of the
    passwd program while it is executing.  By supplying a carefully
    designed argument to the passwd program, intruders may be able to
    force passwd to execute arbitrary commands.  As passwd is setuid
    root, it may allow intruders to run arbitrary commands with root
    privileges.

    By default, a dynamically linked version of the passwd program is
    found in /bin under HP-UX 9.x and in /usr/bin under HP-UX 10.x.  A
    statically linked version is also available under HP-UX 10.x and is
    located in /sbin.

    Exploit information involving this vulnerability has been made 
    publicly available.

2.  Impact

    Local users may gain root privileges.

3.  Workarounds/Solution

    AUSCERT recommends that sites limit the possible exploitation of this
    vulnerability by immediately applying the workarounds given in Sections
    3.1.1 and 3.1.2.  Sites using either HP-UX 9.x or HP-UX 10.x will need 
    to apply the workaround given in Section 3.1.1.  In addition, sites
    using HP-UX 10.x will also need to apply the workaround given in
    Section 3.1.2.

    Currently there are no vendor patches available that address this
    vulnerability.  AUSCERT recommends that official vendor patches be
    installed when they are made available.

3.1.1 Install passwd wrapper

    AUSCERT has developed a wrapper to help prevent programs from being
    exploited using the vulnerability described in this advisory.  This
    wrapper, including installation instructions, can be found at:

        ftp://ftp.auscert.org.au/pub/auscert/tools/overflow_wrapper.c

    This wrapper replaces the passwd program and checks the length of the
    command line arguments which are passed to it.  If an argument exceeds
    a certain predefined value (MAXARGLEN), the wrapper exits without
    executing the passwd command.  The wrapper program can also be
    configured to syslog any failed attempts to execute passwd with
    arguments exceeding MAXARGLEN.  For further instructions on using this
    wrapper, please read the comments at the top of overflow_wrapper.c.

    When compiling overflow_wrapper.c for use with HP-UX passwd, AUSCERT
    recommends defining MAXARGLEN to be 64.

    The MD5 checksum for Version 1.0 of overflow_wrapper.c is:

        MD5 (overflow_wrapper.c) = f7f83af7f3f0ec1188ed26cf9280f6db

    AUSCERT recommends that until vendor patches can be installed,
    sites apply this workaround.

    The overflow_wrapper.c program provides functionality identical to
    passwd_wrapper.c included in the previous version of this advisory.
    Sites that have already installed passwd_wrapper.c do not need to
    install overflow_wrapper.c.

    Sites using HP-UX 10.x will need to additionally apply the workaround
    given in Section 3.1.2.

3.1.2 Remove setuid and non-root execute permissions on /sbin/passwd

    Under HP-UX 10.x, a statically linked copy of the passwd program is
    located in /sbin.  This copy of the passwd program is available for
    root to use when only the root partition is mounted, for example, when
    in single user mode.  There is no need for non-root users to use this
    copy of the passwd program, so setuid and non-root execute permissions
    should be removed.

	# ls -l /sbin/passwd
	-r-sr-xr-x   1 root   bin  487424 Jun 10 17:00 /sbin/passwd

	# chmod 500 /sbin/passwd
	# ls -l /sbin/passwd
	-r-x------   1 root   bin  487424 Jun 10 17:00 /sbin/passwd

    Note this will remove the ability for non-root users to execute
    /sbin/passwd.

4.  Additional measures

    During the installation of HP-UX patches, copies of files being
    replaced are saved in case the patches need to be backed out of.  The
    original versions of patched files are stored in the following
    locations:

	HP-UX 9.x:	/system/<PATCH-NAME>/orig/
	HP-UX 10.x:	/var/adm/sw/patch/PATCH_NAME>/

    If patches for vulnerable programs have been previously installed,
    copies of the vulnerable programs may be available in the above
    locations.  Sites should ensure the directories have permissions
    which restrict access to the patch areas.

----------------------------------------------------------------------------
AUSCERT thanks Hewlett-Packard for their continued assistance and technical
expertise essential for the production of this advisory.  AUSCERT also
thanks Information Technology Services of the University of Southern
Queensland, Albert Lunde (Northwestern University) and CERT/CC for
their assistance.
----------------------------------------------------------------------------

2. fpkg2swpkg Program Vulnerability

===========================================================================
AA-96.14                        AUSCERT Advisory
                         HP-UX fpkg2swpkg Vulnerability
                                29 November 1996

Last Revised: --

----------------------------------------------------------------------------
AUSCERT has received information that a vulnerability exists in the
HP-UX 10.x program fpkg2swpkg.

This vulnerability may allow local users to gain root privileges.

Exploit information involving this vulnerability has been made 
publicly available.

At this stage, AUSCERT is unaware of any official vendor patches.  AUSCERT
recommends that sites apply the workaround given in Section 3 until vendor
patches are made available.

This advisory will be updated as more information becomes available.
----------------------------------------------------------------------------

1.  Description

    The HP-UX 10.x fpkg2swpkg(1m) program is used to translate fpkg (HP-UX
    9.x) network media or Product Specification Files (PSFs) to SD
    swpackage (HP-UX 10.x) PSFs.

    The fpkg2swpkg program creates files in an insecure manner.  As this
    program executes with root privileges, it is possible for local users
    to create or append to arbitrary files on the system.

    Exploit information involving this vulnerability has been made publicly
    available.

    The default location for fpkg2swpkg is /usr/sbin/fpkg2swpkg.

2.  Impact

    Local users may be able to create or append to arbitrary files on
    the system.  This can be leveraged to gain root privileges.

3.  Workarounds/Solution

    AUSCERT recommends that sites prevent the exploitation of the
    vulnerability in fpkg2swpkg by immediately applying the
    workaround given in Section 3.1.

    Currently there are no vendor patches available that address this
    vulnerability.  AUSCERT recommends that official vendor patches be
    installed when they are made available.

3.1 Remove setuid and execute permissions

    Until official vendor patches are made available, sites should remove
    the setuid root and execute permissions from fpkg2swpkg.  To do this,
    the following command should be run as root:

        # chmod 400 /usr/sbin/fpkg2swpkg
        # ls -l /usr/sbin/fpkg2swpkg
        -r--------   1 root bin    57344 May 30 1996 /usr/sbin/fpkg2swpkg

    Note that this will remove the ability for any user to run this
    program.  If only the setuid permissions are removed, it is still
    possible for users to gain privileges when fpkg2swpkg is executed
    by the root user.

4.  Additional measures

    Most Unix systems ship with numerous programs which have setuid or
    setgid privileges.  Often the functionality supplied by these
    privileged programs is not required by many sites.  The large number
    of privileged programs that are shipped by default are to cater for
    all possible uses of the system.

    AUSCERT encourages sites to examine all the setuid/setgid programs
    and determine the necessity of each program.  If a program does not
    absolutely require the setuid/setgid privileges to operate (for
    example, it is only run by the root user),  the setuid/setgid
    privileges should be removed.  Furthermore, if a program is not
    required at your site, then all execute permissions should be removed.

    A sample command to find all setuid/setgid programs is (run as root):

       # find / \( -perm -4000 -o -perm -2000 \) -exec ls -ld {} \;

    It is AUSCERT's experience that many vulnerabilities are being
    discovered in setuid/setgid programs which are not necessary for the
    correct operation of most systems.  Sites can increase their security
    by removing unnecessary setuid/setgid programs.

    For example, the functionality provided by the fpkg2swpkg program is
    not needed by most sites.  If sites had previously disabled the
    fpkg2swpkg program, they would not have been vulnerable to this latest
    exploit.

----------------------------------------------------------------------------
AUSCERT thanks Hewlett-Packard for their continued assistance and technical
expertise essential for the production of this advisory.  AUSCERT also
thanks Information Technology Services of the University of Southern
Queensland for their assistance.
----------------------------------------------------------------------------

3. newgrp Buffer Overrun Vulnerability

===========================================================================
AA-96.16                        AUSCERT Advisory
                      HP-UX newgrp Buffer Overrun Vulnerability
                                3 December 1996

Last Revised: --

----------------------------------------------------------------------------
AUSCERT has received information that a vulnerability exists in the
newgrp(1) program under HP-UX 9.x and 10.x.

This vulnerability may allow local users to gain root privileges.

Exploit information involving this vulnerability has been made publicly
available.

Currently there are no vendor patches available that address this
vulnerability.  AUSCERT recommends that sites take the steps outlined in
section 3 as soon as possible.

This advisory will be updated as more information becomes available.
----------------------------------------------------------------------------

1.  Description

    AUSCERT has received information that a vulnerability exists in the
    HP-UX newgrp(1) program.  The newgrp command is used to change a users
    group identification, and is installed by default.

    Due to insufficient bounds checking on arguments which are supplied
    by users, it is possible to overwrite the internal stack space of the
    newgrp program while it is executing.  By supplying a carefully
    designed argument to the newgrp program, intruders may be able to
    force newgrp to execute arbitrary commands.  As newgrp is setuid
    root, this may allow intruders to run arbitrary commands with root
    privileges.

    This vulnerability is known to affect both HP-UX 9.x and 10.x.

    By default, newgrp is located in /bin under HP-UX 9.x and in
    /usr/bin under HP-UX 10.x.

    Exploit information involving this vulnerability has been made 
    publicly available.

2.  Impact

    Local users may gain root privileges.

3.  Workarounds/Solution

    AUSCERT recommends that sites limit the possible exploitation of this
    vulnerability by immediately removing the setuid permissions as stated
    in Section 3.1.  If the newgrp command is required, AUSCERT recommends
    the newgrp wrapper program given in Section 3.2 be installed.

    Currently there are no vendor patches available that address this
    vulnerability.  AUSCERT recommends that official vendor patches be
    installed when they are made available.

3.1 Remove setuid and non-root execute permissions

    To prevent the exploitation of the vulnerability described in the
    advisory, AUSCERT recommends that the setuid permissions be removed
    from the newgrp program immediately.  As the newgrp program will no
    longer work for non-root users, it is recommended that the execute
    permissions also be removed.  Before doing so, the original permissions
    for newgrp should be noted as they will be needed if sites choose to
    install the newgrp wrapper program (Section 3.2).

    For HP-UX 9.x:

	# ls -l /bin/newgrp
	-r-sr-xr-x   1 root     sys        16384 Dec  2 13:45 /bin/newgrp

	# chmod 500 /bin/newgrp
        # ls -l /bin/newgrp     
	-r-x------   1 root     sys        16384 Dec  2 13:45 /bin/newgrp

    For HP-UX 10.x:

	# ls -l /usr/bin/newgrp
	-r-sr-xr-x   1 root     sys        12288 Dec  2 13:27 /usr/bin/newgrp

	# chmod 500 /usr/bin/newgrp
        # ls -l /usr/bin/newgrp     
	-r-x------   1 root     sys        12288 Dec  2 13:27 /usr/bin/newgrp

    Note that this will remove the ability for any non-root user to run the
    newgrp program. 

3.2 Install newgrp wrapper

    AUSCERT has developed a wrapper to help prevent programs from being
    exploited using the vulnerability described in this advisory.  This
    wrapper, including installation instructions, can be found at:

	ftp://ftp.auscert.org.au/pub/auscert/tools/overflow_wrapper.c

    This replaces the newgrp program with a wrapper which checks the
    length of the command line arguments passed to it.  If an argument
    exceeds a certain predefined value (MAXARGLEN), the wrapper exits
    without executing the newgrp command.  The wrapper program can also
    be configured to syslog any failed attempts to execute newgrp with
    arguments exceeding MAXARGLEN.  For further instructions on using
    this wrapper, please read the comments at the top of overflow_wrapper.c.

    When compiling overflow_wrapper.c for use with HP-UX newgrp, AUSCERT
    recommends defining MAXARGLEN to be 16.

    The MD5 checksum for Version 1.0 of overflow_wrapper.c is:

	MD5 (overflow_wrapper.c) = f7f83af7f3f0ec1188ed26cf9280f6db

    AUSCERT recommends that until vendor patches can be installed, sites
    requiring the newgrp functionality apply this workaround.

----------------------------------------------------------------------------
AUSCERT thanks Hewlett-Packard for their continued assistance and technical
expertise essential for the production of this advisory.  AUSCERT also
thanks Information Technology Services of the University of Southern
Queensland for their assistance.
----------------------------------------------------------------------------

[ End AUSCERT Advisories ]

_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of AUSCERT for the
information contained in this bulletin.
_______________________________________________________________________________

CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
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LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC)

G-47: Unix FLEXlm Vulnerabilities
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H-02: SUN's TCP SYN Flooding Solutions
H-03: HP-UX_suid_Vulnerabilities
H-04: HP-UX  Ping Vulnerability
H-05: Internet Hoaxes
H-07: Sendmail SIGHUP-smtpd Vulnerability
H-08: lpr Buffer Overrun Vulnerability
H-09: HP 9000 Access Vulnerability

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