Math operation, condition check with two different data values (uint256 with uint128 and so).

Lines of code Vulnerability details Impact It may leads to unexpected result during math operation and condition checks. Proof of Concept It is obvious that following lines of codes are written with two different data types. nt256 deltaTime = block.timestamp - currentRateInfo.lastTimestamp;...

织梦前台任意用户密码修改

常见的弱类型问题 类型转换问题 类型转换是无法避免的问题。例如需要将GET或者是POST的参数转换为int类型，或者是两个变量不匹配的时候，PHP会自动地进行变量转换。但是PHP是一个弱类型的语言，导致在进行类型转换的时候会存在很多意想不到的问题。 数学运算 当php进行一些数学计算的时候 因为 md5's878926199a'=0e545993274517709034328855841020就是0的n次方，所以还是等于0 但是要注意： "0e123456abc"=="0e1dddada"//false 这种返回的是为假 语句条件的松散判断 函数的松散判断...

CVE-2017-9698: Improper Restriction of Operations within the Bounds of a Memory Buffer

In Android for MSM, Firefox OS for MSM, QRD Android, with all Android releases from CAF using the Linux kernel, improperly specified offset/size values for a submission command could cause a math operation to overflow and could result in an access to arbitrary memory. The combined pointer will...