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Difference between revisions of "Category:Shellcode"
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| − | + | '''Shellcode''', also known as '''bytecode''', is [[assembly]] which has been translated into properly formatted [[machine code]] ([[binary]] represented in [[hexadecimal]]) for use during [[buffer overflow]] [[exploitation]]. [[Machine code]] can be used by a [[programmer]] to write any application from an [[assembly]] approach because it is just as powerful as any other [[programming language]]. | |
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| + | :Every [[programming language]] eventually becomes [[binary]], whether at ''compile-time'' or ''runtime''. When writing a [[Buffer Overflows|buffer overflow]] there are many obstructions from [[SIM|security infrastructure]], such as [[DEP]], [[ASLR]], [[firewall|firewalls]], or [[IDS]] and [[IPS]] appliances, thus many [[filter bypass]] and [[IDS evasion]] techniques (such as [[alphanumeric shellcode]]) must be utilized for successful [[exploitation]] in modern environments in conjunction with [[anti-heuristics]] and [[shellcode obfuscation|obfuscation]] for maximum effectiveness. There are primarily two types of shellcode: ''executable'' shellcode and ''return-oriented'' shellcode. | ||
'''Executable shellcode''' is typically translated from [[assembly]] written for its respective target [[Operating System]]. | '''Executable shellcode''' is typically translated from [[assembly]] written for its respective target [[Operating System]]. | ||
| − | * Basic executable shellcode, or traditional [[null-free shellcode]] can be used on any vulnerable application (sans filters) with an executable stack. | + | :* Basic executable shellcode, or traditional [[null-free shellcode]] can be used on any vulnerable application (sans filters) with an executable stack. |
| − | * 32-bit [[ascii shellcode]] and 64-bit [[alphanumeric shellcode]] are commonly used for filter bypass and IDS evasion. | + | :* 32-bit [[ascii shellcode]] and 64-bit [[alphanumeric shellcode]] are commonly used for filter bypass and IDS evasion. |
'''Return oriented shellcode''' utilizes [[Return_Oriented_Programming_(ROP)|return oriented programming]] in cases when the vulnerable buffer is non-executable, bypassing the need for an executable stack. | '''Return oriented shellcode''' utilizes [[Return_Oriented_Programming_(ROP)|return oriented programming]] in cases when the vulnerable buffer is non-executable, bypassing the need for an executable stack. | ||
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{{programming}}{{exploitation}}{{social}} | {{programming}}{{exploitation}}{{social}} | ||
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Revision as of 09:36, 7 June 2012
Shellcode, also known as bytecode, is assembly which has been translated into properly formatted machine code (binary represented in hexadecimal) for use during buffer overflow exploitation. Machine code can be used by a programmer to write any application from an assembly approach because it is just as powerful as any other programming language.
- Every programming language eventually becomes binary, whether at compile-time or runtime. When writing a buffer overflow there are many obstructions from security infrastructure, such as DEP, ASLR, firewalls, or IDS and IPS appliances, thus many filter bypass and IDS evasion techniques (such as alphanumeric shellcode) must be utilized for successful exploitation in modern environments in conjunction with anti-heuristics and obfuscation for maximum effectiveness. There are primarily two types of shellcode: executable shellcode and return-oriented shellcode.
Executable shellcode is typically translated from assembly written for its respective target Operating System.
- Basic executable shellcode, or traditional null-free shellcode can be used on any vulnerable application (sans filters) with an executable stack.
- 32-bit ascii shellcode and 64-bit alphanumeric shellcode are commonly used for filter bypass and IDS evasion.
Return oriented shellcode utilizes return oriented programming in cases when the vulnerable buffer is non-executable, bypassing the need for an executable stack.
Shellcode is part of a series on programming.
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Pages in category "Shellcode"
The following 40 pages are in this category, out of 40 total.
