在编程语言中,特别是C++,一个常见的概念是null pointer dereference,也称为空指针引用或指针非法引用。这种情况指的是当试图通过一个空指针(即指向空地址的指针)访问内存时,程序会遇到错误,导致程序崩溃或产生未定义的行为。空指针引用的错误在C++程序中广泛存在,尤其是在那些复杂的代码结构中,尤其...
指针操作不当会产生动态内存错误,比如内存泄漏(MemoryLeakage)、内存的重复释放、空指针解引用(NullPointer Dereference)。 其中空指针引用故障,也叫空指针解引用是一类普遍存在的内存故障,是程序设计语言中一类常见的动态内存错误。指针变量可以指向堆地址、静态变量和空地址单元。当指针指向无效内存地址时对其引用,有可能...
(1)分析漏洞点UserValue = *(PULONG)UserBuffer;从用户模式获取value的值,如果uservalue=magicvalue的值,向缓冲区赋值,并打印信息,反之则释放缓冲区,清空指针( NullPointerDereference = NULL;),之后,对于安全版本,对NullPointerDereference进行检查判断其是否被置空,非安全版本,未对NullPointerDereference进行检查判断,...
can be exploited to e.g. cause crashes duetoNULL-pointer dereferences,out-of-bounds reads, floating point exceptions, integer overflows, [...] hkcert.org hkcert.org 攻擊者可利用其他幾個錯誤,透過特製的媒體檔案,令系統產生例如:取消引用NULL指示器,越界閱讀,浮點異常,「整數」滿溢,過多記憶體損毀及...
•软件:IDA,Windbg,VS2022 漏洞分析 本次实验内容是NullPointerDereference,IRP分发函数通过跳转表进行跳转,使用的控制码是:0x22202b,该示例调用:NullPointerDereferenceIoctlHandler->TriggerNullPointerDereference,漏洞分析 函数一开始先申请了8字节非分页内存,标签是kcaH ...
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Null pointer - Wikipedia : Because a null pointer does not point to a meaningful object, an attempt to dereference (ie. access the data...
UserValue = *(PULONG)UserBuffer;从用户模式获取value的值,如果uservalue=magicvalue的值,向缓冲区赋值,并打印信息,反之则释放缓冲区,清空指针( NullPointerDereference = NULL;),之后,对于安全版本,对NullPointerDereference进行检查判断其是否被置空,非安全版本,...
HEVD_IOCTL_NULL_POINTER_DEREFERENCE控制码对应的派遣函数NullPointerDereferenceIoctlHandler触发漏洞。在测试过程中,当传入值与MagicValue不匹配时,会触发漏洞。官方建议方法是使用NtAllocateVirtualMemory函数在0页申请内存,将shellcode地址放入特定位置,使传入值与MagicValue不匹配,从而触发漏洞。利用payload...
Null Pointer Dereference is a common programming error that occurs when a program tries to access or manipulate a null object. In the context of Android development, this error can lead to app crashes, unexpected behavior, and security vulnerabilities. In this article, we will explore what null...