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TUCoPS :: Unix :: General :: bt401.txt

ike-scan local root format string issue





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http://www.secnetops.biz/research


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Secure Network Operations, Inc.           http://www.secnetops.com
Strategic Reconnaissance Team               research@secnetops.com
Team Lead Contact                                 kf@secnetops.com


Our Mission:
************************************************************************
Secure Network Operations offers expertise in Networking, Intrusion 
Detection Systems (IDS), Software Security Validation, and 
Corporate/Private Network Security. Our mission is to facilitate a 
secure and reliable Internet and inter-enterprise communications 
infrastructure through the products and services we offer. 


Quick Summary:
************************************************************************
Advisory Number         : SRT2003-06-12-0853
Product                 : ike-scan
Version                 : 1.0 & 1.1
Vendor                  : http://www.nta-monitor.com/ike-scan/
Class                   : Local
Criticality             : Low
Operating System(s)     : *nix, cygwin


High Level Explanation
************************************************************************
High Level Description  : Local format string issue in logging functions
What to do              : Please upgrade ike-scan to version 1.2


Technical Details
************************************************************************
Proof Of Concept Status : Secure Network Operations does have PoC code
Low Level Description   : 

In the course of performing security assessments and penetration tests 
for their customers, http://www.nta-monitor.com has found that VPN 
systems often provide full access to the internal network which makes 
them tempting targets to an attacker.

In addition, many people assume that their VPN servers are invisible and 
impenetrable which is a dangerous assumption given that research at NTA 
shows that IPsec VPN systems can be discovered and the manufacturer 
identified.

When this potential for discovery and identification is combined with 
the fact that several VPN vulnerabilities have been reported in the past 
few months, it would seem to be only a matter of time before hackers 
start to target VPN systems.

With this in mind, NTA took the decision to raise awareness of this 
serious industry problem by producing a white paper on how VPN servers 
can be detected and identified, combined with the development of a 
security-auditing program "ike-scan."

The concepts behind ike-scan can be located in the following pdf.
http://www.nta-monitor.com/ike-scan/whitepaper.pdf

In a default configuration ike-scan is not suid root. The suid bit is
not set during the install. As an admin you may have been tricked by a 
user that was perhaps higher on the food chain than you and he really 
wanted to use ike-scan so you had to chmod +s /usr/local/bin/ike-scan
for him. In other words there is potential for this to be exploited. 

[root@Immunity root]# su - nobody
sh-2.05$ /usr/local/bin/ike-scan 127.0.0.1
ERROR: Could not bind UDP socket to local port 500
You need to be root, or ike-scan must be suid root to bind to ports below 
1024.
Only one process may bind to a given port at any one time.
bind: Permission denied

Recently I started using (http://www.wirex.com/shop/index.php/cPath/25)
Immunix 7+ from the Wirex folks and lets just say my night has been 
ruined a few times due to their products protection measures. As an 
example after compiling the new version of ike-scan to show how it was no 
longer exploitable, I found that I was unable to pop items off the 
stack as an example. If I were at work rather than home I would show the 
example however... FormatGuard kinda threw a wrench into that idea. =].

[root@Immunity ike-scan-1.1]# ./ike-scan %x
ike-scan[7372]: ImmunixOS format error - mismatch of 0 in syslog() called 
by err_print

Even though I am the one finding the vulnerabilities, I certainly enjoy 
having Immunix tell me about the exact function being exploited when I run 
the PoC code that was created for a non protected machine. 

After ike-scan is updated to version 1.2 you should see the following in 
your system logs if someone were to attempt to exploit ike-scan.  

Jun 12 20:32:11 Immunity ike-scan[8827]: Starting: /usr/local/bin/ike-scan %x
[root@Immunity ike-scan-1.2]# /usr/local/bin/ike-scan %x
gethostbyname: No such file or directory

If you were on a regular redhat 7.0 machine exploitation would be as 
follows. 

[root@Immunity ike-scan-1.1]# head 0x82-eat_ike-scan.c

/*
**
** ike-scan local root exploit
** exploit by "you dong-hun"(Xpl017Elz), <szoahc@hotmail.com>.
** [x82@xpl017elz bin]$ ls -al ike-scan
** -rwsr-xr-x   1 root     root       100554 Jun  2 06:23 ike-scan
** [x82@xpl017elz bin]$ ./0x82-eat_ike-scan
**  [+] make /tmp/x82 code.
**  [+] Auto Brute-force mode: gethostbyname: Success
**  [+] Ok, exploited successfully.
**  [+] It's shell !
** bash#
**
*/

Vendor Status   : This issue was promptly addressed by the vendor fixes
are available at http://www.nta-monitor.com/ike-scan/download.htm
Please upgrade to ike-scan 1.2.

Bugtraq URL     : to be assigned 

------------------------------------------------------------------------
This advisory was released by Secure Network Operations,Inc. as a matter
of notification to help administrators protect their networks against
the described vulnerability. Exploit source code is no longer released
in our advisories. Contact research@secnetops.com for information on how
to obtain exploit information.


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