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open3sIDSontape.txt

open3sIDSontape.txt
Posted Jan 28, 2004
Authored by Juan Manuel Pascual Escriba | Site open3s.com

A stack-based buffer overflow exists in the ONCONFIG environment variable read process when it is bigger than 495 bytes and read in by the IBM Informix IDSv9.40 ontape binary.

tags | advisory, overflow
SHA-256 | 237129932a9575d521e132d6ce68b9b05c5f0b848a26bc2b6672c672bcf3702a

open3sIDSontape.txt

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        ----------========== OPEN3S-2003-08-08-eng-informix-ontape ==========----------


Title: Local Vulnerability at Informix IDSv9.40 via ontape binary
Date: 08-08-2003
Platform: Only tested in Linux but can be exported to others.
Impact: Any user with DSA privileges over Informix could achieve root
privileges through a stack buffer overflow in ontape binary
Author: Juan Manuel Pascual Escriba pask@open3s.com
Status: Solved by IBM Corp.





PROBLEM SUMMARY:

Stack Buffer overflow exists in ONCONFIG environment variable read
process when it's bigger than 495 bytes.


[informix@dimoni bin]$ export ONCONFIG=`perl -e 'print "A"x495'`
[informix@dimoni bin]$ ./ontape
WARNING: Cannot access configuration file $INFORMIXDIR/etc/$ONCONFIG.
Segmentation fault

[pask@dimoniet bin]$ gdb ./ontape
(gdb) r
WARNING: Cannot access configuration file $INFORMIXDIR/etc/$ONCONFIG.
Segmentation fault

(gdb) info reg
eax 0xffffffff -1
ecx 0x40083580 1074279808
edx 0x46 70
ebx 0x1 1
esp 0xbfff74a0 0xbfff74a0
ebp 0x41414141 0x41414141
esi 0xbfff74cc -1073777460
edi 0x0 0
eip 0x41414141 0x41414141



It's posible to achieve root privileges through this buffer overflow.


IMPACT:
Any user with exec permision over ontape could achieve root
privileges. In my default installation only users with DSA privileges
can exec this binary.


SOLUTION:

See more infomartion about this vulnerability and workaround at:
http://www-1.ibm.com/support/docview.wss?uid=swg21153336


STATUS

Reported to IBM security team at 11th of August 2003

See more infomartion about this vulnerability and workaround at:
http://www-1.ibm.com/support/docview.wss?uid=swg21153336

This vulnerability was managed in an efficient manner by Jonathan Leffler
from IBM Informix Database Engineering Team.




EXPLOIT
http://www.open3s.com/exploits/OPEN3S-2003-08-08-eng-informix-ontape.c




--------------------------------------------------
This vulnerability was researched by:
Juan Manuel Pascual Escriba pask@open3s.com
Barcelona - Spain http://www.open3s.com
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