======================================================= HPUX rexec buffer overflow vulnerability ======================================================= Davide Del Vecchio Adv#5 Discovered in: 19/02/2003 Date: 29/04/2003 Tested on HP-UX B.10.20 Description: The rexec command works the same as remsh except that it uses the rexec() library routine and rexecd for command execution and does not support Kerberos authentication. The "-l" option is used to specify a different remote username. $ ls -al rexec -r-sr-xr-x 1 root bin 20480 Oct 27 1997 rexec Using rexec with "-l" with a long option string: $ rexec 127.0.0.1 -l `perl -e 'printf "A" x 9777'` -n something Memory fault Solution: I'm in contact with HP's Security staff, especially with John Morris, and I would like to thanks him and all his staff for the interest demonstrated during this period of research on HP-UX. He assured me a patch has been written and an Official Security Bullettin will follow my advisory. Credits: Davide Del Vecchio would like to thank all the people supporting him and his research, his coworkers of the security and monitoring staff @ Banca Mediolanum, and obvious, the HP-UX security staff, impersonified in this case in John Morris. Disclaimer: The information within this paper may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties with regard to this information. In no event shall the author be liable for any damages whatsoever arising out of or in connection with the use or spread of this information. Any use of this information is at the user's own risk. ^^^^^^^^ Please send suggestions, updates, and comments to: Davide Del Vecchio , Dante Alighieri - danteat_private / securityat_private www.alighieri.org
This archive was generated by hypermail 2b30 : Tue Apr 29 2003 - 12:49:53 PDT