Date: 31 October 2007
References: ESB-2008.0856
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AUSCERT External Security Bulletin Redistribution
ESB-2007.0852 -- [AIX]
Multiple Vulnerabilities in IBM AIX
31 October 2007
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: swcons
lqueryvg
lquerypv
ftp
dig
bellmail
crontab
Publisher: iDEFENSE
Operating System: AIX
Impact: Root Compromise
Create Arbitrary Files
Denial of Service
Inappropriate Access
Access: Existing Account
CVE Names: CVE-2007-4217 CVE-2007-4513 CVE-2007-4621
CVE-2007-4622 CVE-2007-4623
Original Bulletin:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=611
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=612
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=613
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=614
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=615
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=616
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=617
Comment: This bulletin contains seven (7) AIX security announcements.
- --------------------------BEGIN INCLUDED TEXT--------------------
IBM AIX swcons Local Arbitrary File Access Vulnerability
iDefense Security Advisory 10.30.07
http://labs.idefense.com/intelligence/vulnerabilities/
Oct 30, 2007
I. BACKGROUND
The swcons program is a set-uid root application which is installed by
default on IBM AIX. It allows for console logs to be temporarily logged
to a file or device.
II. DESCRIPTION
Local exploitation of a file access vulnerability in the swcons command
included in multiple versions of IBM Corp.'s AIX could allow for the
creation or modification of arbitrary files anywhere on the system.
The vulnerability specifically exists due to a lack of sanity checking
when using the -p option. If a user specifies a file with the -p
option, the contents of that file will be overwritten with 65,535 bytes
of uncontrolled data. If the file doesn't exist, it will be created. In
both cases, the file will also be converted to mode 222, which allows
all users on the system to modify it. By specifying a system file,
users can cause a denial of service condition or elevate privileges.
III. ANALYSIS
Exploitation allows attackers to execute arbitrary code with root
privileges. The severity of this vulnerability is lessened by the fact
that under a default configuration, the group id "system" is needed to
execute swcons.
IBM originally released an interim fix on February 22nd, 2007. The
original fix did prevent attackers from being able to overwrite or
change the ownership of existing files, but did not prevent the
creation of new files via symlink attacks.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability on IBM AIX
version 5.2. It is suspected that previous versions are also
vulnerable.
V. WORKAROUND
Only allow trusted users local access to security critical systems.
Limit access to the "system" group. Alternately, remove the set-uid bit
from the swcons program.
VI. VENDOR RESPONSE
IBM Corp. has addressed this vulnerability by releasing interim fixes.
More information can be found via the Bulletins tab of IBM's
Subscription Service for UNIX and Linux servers. You can reach this
service by clicking the URL shown below.
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=1
VII. CVE INFORMATION
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.
VIII. DISCLOSURE TIMELINE
12/21/2004 Initial vendor notification
01/07/2005 Initial vendor response
10/30/2007 Coordinated public disclosure
IX. CREDIT
This vulnerability was reported to iDefense by Alex DeLarge.
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
Free tools, research and upcoming events
http://labs.idefense.com/
X. LEGAL NOTICES
Copyright © 2007 iDefense, Inc.
Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail customerservice@idefense.com for permission.
Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.
=============================================================================
IBM AIX 5.2 crontab BSS Buffer Overflow Vulnerability
iDefense Security Advisory 10.30.07
http://labs.idefense.com/intelligence/vulnerabilities/
Oct 30, 2007
I. BACKGROUND
The crontab program is a user utility that enables users to create,
remove, and edit cron jobs. The cron jobs will then later be executed,
on behalf of the user, at the specified time. Under AIX, the crontab
program is installed by default and is set-uid root. More information
can be found at the URL shown.
http://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.cmds/doc/aixcmds1/crontab.htm
II. DESCRIPTION
Local exploitation of a buffer overflow vulnerability in the crontab
program of IBM Corp.'s AIX 5.2 operating system allows attackers to
execute arbitrary code with root privileges.
The problem specifically exists within the main function. While
processing command line arguments, the crontab program will copy a
user-supplied argument to a fixed size BSS (data segment) buffer. Since
no bounds checking is performed, it's possible to overwrite a large
portion of the data stored in the BSS memory area.
III. ANALYSIS
Exploitation allows an attacker to execute arbitrary code with root
privileges. Local access is required to execute the crontab program.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability within AIX
version 5.2. Previous versions are suspected to be vulnerable. AIX 5.3
does not appear to be vulnerable.
V. WORKAROUND
Removing the set-uid bit from the crontab program will protect against
exploitation. However, doing so will render the program unusable.
VI. VENDOR RESPONSE
IBM Corp. has addressed this vulnerability by releasing interim fixes.
More information can be found via the Bulletins tab of IBM's
Subscription Service for UNIX and Linux servers. You can reach this
service by clicking the URL shown below.
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=1
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-4621 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.
VIII. DISCLOSURE TIMELINE
08/29/2007 Initial vendor notification
09/12/2007 Initial vendor response
10/30/2007 Coordinated public disclosure
IX. CREDIT
The discoverer of this vulnerability wishes to remain anonymous.
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
Free tools, research and upcoming events
http://labs.idefense.com/
X. LEGAL NOTICES
Copyright © 2007 iDefense, Inc.
Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail customerservice@idefense.com for permission.
Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.
=============================================================================
IBM AIX dig dns_name_fromtext Integer Underflow Vulnerability
iDefense Security Advisory 10.30.07
http://labs.idefense.com/intelligence/vulnerabilities/
Oct 30, 2007
I. BACKGROUND
dig is a utility that is commonly used for DNS diagnostics. Under AIX
5.2, the dig program is installed by default and is set-uid root. More
information can be found at the URL shown.
http://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.cmds/doc/aixcmds2/dig.htm
II. DESCRIPTION
Local exploitation of an integer underflow vulnerability in the dig
program of IBM Corp.'s AIX operating system allows attackers to execute
arbitrary code with root privileges.
The problem specifically exists within dns_name_fromtext function within
the libdns.a library. This function is called when processing the '-y'
command line parameter to the dig program. By supplying a specially
crafted TSIG key parameter, an attacker is able to cause an integer
underflow, resulting in potentially exploitable heap corruption.
III. ANALYSIS
Exploitation allows an attacker to execute arbitrary code with root
privileges. Local access is required to execute the dig program.
It should be noted that this particular issue is documented within the
bind release notes as bug #1211 and #1350. However, this particular
vulnerability is specific to AIX 5.2 since it installs the dig program
set-uid root.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability within AIX
version 5.2. Previous versions are suspected to be vulnerable. AIX 5.3
is not vulnerable since the dig command is no longer installed set-uid
root.
V. WORKAROUND
Removing the set-uid bit from the dig program will prevent exploitation.
VI. VENDOR RESPONSE
IBM Corp. has addressed this vulnerability by releasing interim fixes.
More information can be found via the Bulletins tab of IBM's
Subscription Service for UNIX and Linux servers. You can reach this
service by clicking the URL shown below.
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=1
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-4622 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.
VIII. DISCLOSURE TIMELINE
08/30/2007 Initial vendor notification
09/14/2007 Initial vendor response
10/30/2007 Coordinated public disclosure
IX. CREDIT
The discoverer of this vulnerability wishes to remain anonymous.
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
Free tools, research and upcoming events
http://labs.idefense.com/
X. LEGAL NOTICES
Copyright © 2007 iDefense, Inc.
Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail customerservice@idefense.com for permission.
Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.
=============================================================================
IBM AIX lqueryvg Stack Buffer Overflow Vulnerability
iDefense Security Advisory 10.30.07
http://labs.idefense.com/intelligence/vulnerabilities/
Oct 30, 2007
I. BACKGROUND
The lqueryvg utility is used to examine the properties of disk volume
groups. It is installed set-uid root by default on multiple versions of
AIX.
II. DESCRIPTION
Local exploitation of a stack buffer overflow vulnerability in IBM
Corp.'s AIX operating system may allow an attacker to execute arbitrary
code with root privileges.
The vulnerability exists within the parsing of the '-p' command line
option. The argument to this option is copied into a fixed size stack
buffer using the sprintf() function without properly validating the
length. This leads to an exploitable stack buffer overflow.
III. ANALYSIS
Exploitation of this vulnerability results in the execution of arbitrary
code with root privileges. The binary may be executed by any user with a
local account, no special group membership is needed.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability in AIX
version 5.2 and 5.3. Previous versions may also be affected.
V. WORKAROUND
Removing the set-uid bit from the binary will prevent exploitation, but
may make the program unusable by non-root users.
VI. VENDOR RESPONSE
IBM Corp. has addressed this vulnerability by releasing interim fixes.
More information can be found via the Bulletins tab of IBM's
Subscription Service for UNIX and Linux servers. You can reach this
service by clicking the URL shown below.
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=1
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-4513 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.
VIII. DISCLOSURE TIMELINE
08/21/2007 Initial vendor notification
08/22/2007 Initial vendor response
10/30/2007 Coordinated public disclosure
IX. CREDIT
This vulnerability was discovered by Sean Larsson of VeriSign iDefense
Labs.
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
Free tools, research and upcoming events
http://labs.idefense.com/
X. LEGAL NOTICES
Copyright © 2007 iDefense, Inc.
Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail customerservice@idefense.com for permission.
Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.
=============================================================================
IBM AIX lquerypv Stack Buffer Overflow Vulnerability
iDefense Security Advisory 10.30.07
http://labs.idefense.com/intelligence/vulnerabilities/
Oct 30, 2007
I. BACKGROUND
The lquerypv utility is used to examine the properties of a physical
volume in a volume group. It is installed set-uid root by default on
multiple versions of AIX.
II. DESCRIPTION
Local exploitation of a stack buffer overflow vulnerability in IBM
Corp.'s AIX operating system may allow an attacker to execute arbitrary
code with root privileges.
The vulnerability exists within the parsing of the '-V' command line
option. The argument to this option is copied into a fixed size stack
buffer using the sprintf() function without properly validating the
length. This leads to an exploitable stack buffer overflow.
III. ANALYSIS
Exploitation of this vulnerability results in the execution of arbitrary
code with root privileges. The binary may be executed by any user with a
local account, no special group membership is needed.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability in AIX
version 5.2 and 5.3. Previous versions may also be affected.
V. WORKAROUND
Removing the set-uid bit from the binary will prevent exploitation, but
may make the program unusable by non-root users.
VI. VENDOR RESPONSE
IBM Corp. has addressed this vulnerability by releasing interim fixes.
More information can be found via the Bulletins tab of IBM's
Subscription Service for UNIX and Linux servers. You can reach this
service by clicking the URL shown below.
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=1
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-4513 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.
VIII. DISCLOSURE TIMELINE
08/21/2007 Initial vendor notification
08/22/2007 Initial vendor response
10/30/2007 Coordinated public disclosure
IX. CREDIT
This vulnerability was discovered by Sean Larsson of VeriSign iDefense
Labs.
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
Free tools, research and upcoming events
http://labs.idefense.com/
X. LEGAL NOTICES
Copyright © 2007 iDefense, Inc.
Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail customerservice@idefense.com for permission.
Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.
=============================================================================
IBM AIX ftp domacro Parameter Buffer Overflow Vulnerability
iDefense Security Advisory 10.30.07
http://labs.idefense.com/intelligence/vulnerabilities/
Oct 30, 2007
I. BACKGROUND
The ftp program is a client application for accessing data stored on FTP
servers. This client is responsible for interfacing with users and
speaking the FTP protocol with remote servers. Under AIX, the ftp
program is installed by default and is set-uid root. More information
can be found at the URL shown below.
http://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.cmds/doc/aixcmds2/ftp.htm
II. DESCRIPTION
Local exploitation of a buffer overflow vulnerability in the ftp client
of IBM Corp.'s AIX operating system allows attackers to execute
arbitrary code with root privileges.
The problem specifically exists within the domacro() function. This
function is called when executing a macro via the '$' command within
the ftp program. When executing a macro, the parameter is copied to a
fixed size stack buffer using an unbounded call to strcpy(). By
specifying a long argument, an attacker is able to overwrite program
control data located on the stack and take control of the affected
process.
III. ANALYSIS
Exploitation allows an attacker to execute arbitrary code with root
privileges. Local access is required to execute and interact with the
ftp program.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability in AIX
version 5.3 (5300-06). Previous versions are suspected to be
vulnerable.
V. WORKAROUND
Removing the set-uid bit from the ftp program will protect against
exploitation. However, doing so will render the program unusable.
VI. VENDOR RESPONSE
IBM Corp. has addressed this vulnerability by releasing interim fixes.
More information can be found via the Bulletins tab of IBM's
Subscription Service for UNIX and Linux servers. You can reach this
service by clicking the URL shown below.
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=1
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-4217 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.
VIII. DISCLOSURE TIMELINE
08/15/2007 Initial vendor notification
08/15/2007 Initial vendor response
10/30/2007 Coordinated public disclosure
IX. CREDIT
This vulnerability was discovered by Joshua J. Drake of VeriSign
iDefense Labs.
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
Free tools, research and upcoming events
http://labs.idefense.com/
X. LEGAL NOTICES
Copyright © 2007 iDefense, Inc.
Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail customerservice@idefense.com for permission.
Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.
=============================================================================
IBM AIX bellmail Stack Buffer Overflow Vulnerability
iDefense Security Advisory 10.30.07
http://labs.idefense.com/intelligence/vulnerabilities/
Oct 30, 2007
I. BACKGROUND
bellmail is a mail user-agent (MUA) and is commonly used for accessing
locally stored electronic mail messages. Under AIX, the bellmail
program is installed by default and is set-uid root. More information
can be found at the URL shown.
http://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.commadmn/doc/commadmndita/mail_bellmail.htm
II. DESCRIPTION
Local exploitation of a buffer overflow vulnerability in the bellmail
program of IBM Corp.'s AIX operating system allows attackers to execute
arbitrary code with root privileges.
The problem specifically exists within sendrmt function. This function
is called when a user tries to send mail using the "m" command. Within
this function, several sprintf calls are made to concatenate
user-supplied input with static strings. No bounds checking is
performed to ensure that the resulting string will fit in the
destination buffer located on the stack. By supplying a long parameter,
an attacker is able to overwrite program control data located on the
stack and take control of the affected process.
III. ANALYSIS
Exploitation allows an attacker to execute arbitrary code with root
privileges. Local access is required to execute and interact with the
bellmail program.
It should be noted that the bellmail program does initially set its user
(both saved and effective) to that of the calling user. Generally, it
would be sufficient to drop these privileges. However, in this case,
the bellmail program uses the AIX-specific setpriv functionality to
retain the ability chown arbitrary files on the system.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability within AIX
version 5.3 (5300-06) and 5.2. Previous versions are suspected to be
vulnerable.
V. WORKAROUND
Removing the set-uid bit from the bellmail program will protect against
exploitation. However, doing so will render the program unusable.
VI. VENDOR RESPONSE
IBM Corp. has addressed this vulnerability by releasing interim fixes.
More information can be found via the Bulletins tab of IBM's
Subscription Service for UNIX and Linux servers. You can reach this
service by clicking the URL shown below.
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=1
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-4623 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.
VIII. DISCLOSURE TIMELINE
08/28/2007 Initial vendor notification
08/28/2007 Initial vendor response
10/30/2007 Coordinated public disclosure
IX. CREDIT
This vulnerability was discovered by Joshua J. Drake of VeriSign
iDefense Labs.
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
Free tools, research and upcoming events
http://labs.idefense.com/
X. LEGAL NOTICES
Copyright © 2007 iDefense, Inc.
Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail customerservice@idefense.com for permission.
Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.
- --------------------------END INCLUDED TEXT--------------------
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