Enomaly ECP / Enomalism < 2.2.1 - Multiple Local Vulnerabilities

Enomaly ECP/Enomalism: Multiple vulnerabilities in enomalism2.sh (redux)



Synopsis



All versions of Enomaly ECP/Enomalism[1] before 2.2.1 have multiple issues

relating to the use of temporary files in an insecure manner.



Fixes for CVE-2008-4990[2] and CVE-2009-0390[3] in 2.1.1 and 2.2 were found

to be ineffective.



Background



Enomaly ECP (formerly Enomalism) is management software for virtual machines.



Description



Sam Johnston[4] of Australian Online Solutions[5] reported multiple

vulnerabilities in enomalism2.sh:

 - Race condition on $PIDFILE renders 2.1.1 fixes ineffective

 - Incomplete fixes in 2.1.1/2.2 fail to address stop/restart functions

 - Root ownership check (ls -l $PIDFILE |grep root) is trivially bypassed by:

   - changing the symlink's group to one containing the word 'root' or

   - creating a symlink to any filename containing the word 'root'

 - Process check (ps -p $PID |grep enomalism2d) is also trivially bypassed.



Impact



A local attacker could perform a symlink attack to overwrite arbitrary files

on the system with root privileges, inject arguments to the 'kill' command

to terminate or send arbitrary signals to any process(es) as root or launch

a denial of service attack by preventing the virtual machines from starting.



Exploits



a. while true; do ln -s /etc/passwd /tmp/enomalism2.pid; done

b. echo "-9 1" > /tmp/enomalism2.pid

c. i. ln -s /tmp/root /tmp/enomalism2.pid

  ii. chgrp beetroot /tmp/enomalism2.pid



Workaround



Change PIDFILE from /tmp/enomalism2.pid to /var/run/enomalism2.pid



Resolution



All Enomaly ECP and Enomalism users should upgrade to version 2.2.1[6] which

includes researcher fix.



History



2009-02-09 Bug initially reported to Enomaly by mail

2009-02-09 CVE(s) requested from Mitre; TBA

2009-02-09 Product Development Manager acknowledged receipt.

  "Thanks, we're incorporating a fix for the next release."

2009-02-10 Update announced[7] with no mention of security vulnerability:

  "ECP 2.2.1 is now available on both sourceforge and pypi.  This is a

  bug-fix release.  No new features have been added."

2009-02-14 Publication of vulnerability



References

1. http://sourceforge.net/projects/enomalism

2. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2008-4990

3. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-0390

4. http://samj.net/

5. http://www.aos.net.au/

6. http://sourceforge.net/project/showfiles.php?group_id=164855&package_id=186866&release_id=660061

7. http://groups.google.com/group/enomalism/browse_thread/thread/ae94ac7cb5fa7683



# milw0rm.com [2009-02-16]