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Ceh v5 module 20 buffer overflow
1.
Module XX Buffer Overflows Ethical
Hacking Version 5
2.
EC-Council Copyright © by
EC-Council All Rights reserved. Reproduction is strictly prohibited Module Objective This module will familiarize you with the following: Buffer Overflows Reasons for buffer overflow attacks Types of buffer overflow Stacks Shell code Detecting buffer overflows in a program Mutating buffer Overflow exploit Buffer overflow countermeasures Code Analysis
3.
EC-Council Copyright © by
EC-Council All Rights reserved. Reproduction is strictly prohibited Module Flow Buffer Overflows Code Analysis Types of Buffer Overflow Reasons for Buffer Overflow Attacks Detecting Buffer Overflows In a Program Shell Code Defense against Buffer OverflowsStacks Mutating Buffer Overflow Exploit Attacking a Real Program
4.
EC-Council Copyright © by
EC-Council All Rights reserved. Reproduction is strictly prohibited Why are Programs/Applications Vulnerable? Since there is lot of pressure to maintain the turnaround of deliverables, programmers are bound to make mistakes that are often overlooked Boundary checks are not done fully or, in most cases, they are skipped entirely Programming languages, such as C, which programmers use to develop packages or applications, have errors in it The strcat(), strcpy(), sprintf(), vsprintf(), bcopy(), gets(), and scanf() calls in C language can be exploited because these functions do not check to see if the buffer, allocated on the stack, is large enough for the data copied into the buffer Good programming practices are not adhered to
5.
EC-Council Copyright © by
EC-Council All Rights reserved. Reproduction is strictly prohibited Buffer Overflows A buffer overrun is when a program allocates a block of memory of a certain length and then tries to stuff too much data into the buffer, with extra overflowing and overwriting possibly critical information crucial to the normal execution of the program Consider the following source code. When the source is compiled and turned into a program and the program is run, it will assign a block of memory 32 bytes long to hold the name string #include<stdio.h> int main ( int argc , char **argv) { char target[5]=”TTTT”; char attacker[11]=”AAAAAAAAAA”; strcpy( attacker,” DDDDDDDDDDDDDD”); printf(“% n”,target); return 0; } This type of vulnerability is prevalent in UNIX- and NT-based systems
6.
EC-Council Copyright © by
EC-Council All Rights reserved. Reproduction is strictly prohibited Reasons for Buffer Overflow Attacks Buffer overflow attacks depend on two things: the lack of boundary testing and a machine that can execute code that resides in the data/stack segment The lack of boundary is very common and, usually, the program ends with segmentation fault or bus error. In order to exploit buffer overflow to gain access to or escalate privileges, the offender must create the data to be fed to the application Random data will generate a segmentation fault or bus error, never a remote shell or the execution of a command
7.
EC-Council Copyright © by
EC-Council All Rights reserved. Reproduction is strictly prohibited Knowledge Required to Program Buffer Overflow Exploits 1. C functions and the stack 2. A little knowledge of assembly/machine language 3. How system calls are made (at the machine code level) 4. exec( ) system calls 5. How to guess some key parameters
8.
EC-Council Copyright © by
EC-Council All Rights reserved. Reproduction is strictly prohibited Types of Buffer Overflows Stack-based Buffer Overflow Heap/BSS-based Buffer Overflow
9.
EC-Council Copyright © by
EC-Council All Rights reserved. Reproduction is strictly prohibited Stack-based Buffer Overflow Buffer is expecting a maximum number of guests Send the buffer more than x guests If the system does not perform boundary checks, extra guests continue to be placed at positions beyond the legitimate locations within the buffer. (Java does not permit to run off the end of an array or string as C and C++ do) Malicious code can be pushed on the stack The overflow can overwrite the return pointer so that the flow of control switches to the malicious code
10.
EC-Council Copyright © by
EC-Council All Rights reserved. Reproduction is strictly prohibited Understanding Assembly Language The two most important operations in a stack: • 1. Push – put one item on the top of the stack • 2. Pop – "remove" one item from the top of the stack • Typically, returns the contents pointed to by a pointer and changes the pointer (not the memory contents)
11.
EC-Council Copyright © by
EC-Council All Rights reserved. Reproduction is strictly prohibited Understanding Stacks The stack is a (LIFO) mechanism that computers use both to pass arguments to functions and to reference local variables It acts like a buffer, holding all of the information that the function needs The stack is created at the beginning of a function and released at the end of it BP anywhere within the stack frame SP points here Stack growth direction
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EC-Council All Rights reserved. Reproduction is strictly prohibited A Normal Stack
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EC-Council All Rights reserved. Reproduction is strictly prohibited Shellcode Shellcode is a method used to exploit stack-based overflows Shellcodes exploit computer bugs in how the stack is handled Buffers are soft targets for attackers as they overflow very easily if the conditions match "x2dx0bxd8x9axacx15xa1x6ex2fx0bxdcxdax90x0bx80x0e" "x92x03xa0x08x94x1ax80x0ax9cx03xa0x10xecx3bxbfxf0" "xdcx23xbfxf8xc0x23xbfxfcx82x10x20x3bxaax10x3fxff" "x91xd5x60x01x90x1bxc0x0fx82x10x20x01x91xd5x60x01"
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EC-Council All Rights reserved. Reproduction is strictly prohibited Heap-based Buffer Overflow Variables that are dynamically allocated with functions, such as malloc(), are created on the heap Heap is a memory that is dynamically allocated. It is different from the memory that is allocated for stack and code In a heap-based buffer overflow attack, an attacker overflows a buffer that is placed on the lower part of heap, overwriting other dynamic variables, which can have unexpected and unwanted effects
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EC-Council All Rights reserved. Reproduction is strictly prohibited How to Detect Buffer Overflows in a Program There are two ways to detect buffer overflows: • One way is to look at the source code. In this case, the hacker can look for strings declared as local variables in functions or methods and verify the presence of boundary checks. It is also necessary to check for improper use of standard functions, especially those related to strings and input/output • Another way is to feed the application with huge amounts of data and check for abnormal behavior
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EC-Council All Rights reserved. Reproduction is strictly prohibited Attacking a Real Program Assuming that a string function is being exploited, the attacker can send a long string as the input This string overflows the buffer and causes a segmentation error The return pointer of the function is overwritten, and the attacker succeeds in altering the flow of execution If he has to insert his code in the input, he has to: • Know the exact address on the stack • Know the size of the stack • Make the return pointer point to his code for execution
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EC-Council All Rights reserved. Reproduction is strictly prohibited NOPS Most CPUs have a No Operation (NOP) instruction – it does nothing but advance the instruction pointer Usually, we can put some of these ahead of our program (in the string) As long as the new return address points to a NOP, we are OK Attacker pads the beginning of the intended buffer overflow with a long run of NOP instructions (a NOP slide or sled) so the CPU will do nothing until it gets to the 'main event' (which preceded the 'return pointer') Most intrusion detection systems (IDSs) look for signatures of NOP sleds. ADMutate (by K2) accepts a buffer overflow exploit as input and randomly creates a functionally equivalent version (polymorphism)
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EC-Council All Rights reserved. Reproduction is strictly prohibited How to Mutate a Buffer Overflow Exploit For the NOP portion Randomly replace the NOPs with functionally equivalent segments of code (e.g.: x++; x-; ? NOP NOP) For the "main event" Apply XOR to combine code with a random key unintelligible to IDS. The CPU code must also decode the gibberish in time in order to run the decoder. By itself, the decoder is polymorphic and, therefore, hard to spot For the "return pointer" Randomly tweak LSB of pointer to land in the NOP-zone
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EC-Council All Rights reserved. Reproduction is strictly prohibited Once the Stack is Smashed... Once the vulnerable process is commandeered, the attacker has the same privileges as the process and can gain normal access. He can then exploit a local buffer overflow vulnerability to gain super-user access Create a backdoor Using (UNIX-specific) inetd Using Trivial FTP (TFTP) included with Windows 2000 and some UNIX flavors Use Netcat to make raw, interactive connections Shoot back an Xterminal connection UNIX-specific GUI
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EC-Council All Rights reserved. Reproduction is strictly prohibited Defense Against Buffer Overflows Manual auditing of code Disabling stack execution Safer C library support Compiler techniques
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EC-Council All Rights reserved. Reproduction is strictly prohibited Tool to Defend Buffer Overflow: Return Address Defender (RAD) RAD is a simple patch for the compiler that automatically creates a safe area to store a copy of return addresses After that, RAD automatically adds protection code into applications that it compiles to defend programs against buffer overflow attacks RAD does not change the stack layout
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EC-Council All Rights reserved. Reproduction is strictly prohibited Tool to Defend Buffer Overflow: StackGuard StackGuard: Protects systems from stack smashing attacks StackGuard is a compiler approach for defending programs and systems against "stack smashing" attacks Programs that have been compiled with StackGuard are largely immune to stack smashing attacks Protection requires no source code changes at all. When a vulnerability is exploited, StackGuard detects the attack in progress, raises an intrusion alert, and halts the victim program http://www.cse.ogi.edu/DISC/projects/immunix/StackGuard/
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EC-Council All Rights reserved. Reproduction is strictly prohibited Tool to Defend Buffer Overflow: Immunix System Immunix System is an Immunix-enabled RedHat Linux distribution and suite of application-level security tools Immunix secures a Linux OS and applications Immunix works by hardening existing software components and platforms so that attempts to exploit security vulnerabilities will fail safe. That is, the compromised process halts instead of giving control to the attacker, and then is restarted http://immunix.org
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EC-Council All Rights reserved. Reproduction is strictly prohibited Simple Buffer Overflow in C Vulnerable C Program overrun.c #include <stdio.h> main() { char *name; char *dangerous_system_command; name = (char *) malloc(10); dangerous_system_command = (char *) malloc(128); printf("Address of name is %dn", name); printf("Address of command is %dn", dangerous_system_command); sprintf(dangerous_system_command, "echo %s", "Hello world!"); printf("What's your name?"); gets(name); system(dangerous_system_command); }
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EC-Council All Rights reserved. Reproduction is strictly prohibited Summary A buffer overflow occurs when a program or process tries to store more data in a buffer (temporary data storage area) than it was intended to hold Buffer overflow attacks depend on: the lack of boundary testing, and a machine that can execute code that resides in the data/stack segment Buffer overflow vulnerability can be detected by skilled auditing of the code as well as boundary testing Once the stack is smashed, the attacker can deploy his payload and take control of the attacked system Countermeasures include checking the code, disabling stack execution, safer C library support, and using safer compiler techniques Tools like stackguard, Immunix, and vulnerability scanners help in securing systems
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