继续对Fortify的漏洞进行总结,本篇主要针对  Denial of Service: Regular Expression  漏洞进行总结,如下: 1.Denial of Service: Regular Expression 1.1.产生原因: 实施正则表达式评估程序及相关方法时存在漏洞,该漏洞会导致评估线程在处理嵌套和重复的正则表达式组的重复和交替重叠时挂起.此缺陷可被攻击者用于执行拒绝服务 (DoS) 攻击. 示例: (e+)+ ([a-zA-Z]+)* (e|ee)+ 已知的正则表达…

前期现场反馈系统扫描出Slow HTTP Denial of Service Attack漏洞,根据以往经验提供了更改建议,居然没有生效,深入研究了一下WebLogic下该漏洞的修复方法,现记录如下: 1.在tomcat环境下,修复方法: 找到tomacat下的文件server.xml,找到如下信息, 原来为20000,修改为20,重启服务就行了: 2.在WebLogic环境下: 更改WebLogic中默认的完成消息超时时间或者限制HTTP头部传输最大许可时间为10-15S.如图为weblogi…

编辑 删除 问题名称: Slow HTTP Denial of Service Attack 问题URL http://10.238.*.*:58*** 风险等级: 高 问题类型: 服务器配置类 漏洞描述: 利用的HTTP POST:POST的时候,指定一个非常大的 content-length,然后以很低的速度发包,比如10-100s发一个字节,hold住这个连接不断开.这样当客户端连接多了后,占用住了webserver的所有可用连接,从而导致DOS. 解决方案: 对web服务器的http头部…

继续对Fortify的漏洞进行总结,本篇主要针对 Portability Flaw: File Separator 和  Poor Error Handling: Return Inside Finally 漏洞进行总结,如下: 1.Portability Flaw: File Separator(文件分隔符) 1.1.产生原因: 不同的操作系统使用不同的字符作为文件分隔符.例如,Microsoft Windows 系统使用“\”,而 UNIX 系统则使用“/”.应用程序需要在不同的平台上运行时…

整改建议 1.中断使用URL不支持HTTP方法访问的会话 2.限制HTTP头及包长至一个合理数值 3.设置一个绝对的会话超时时间 4.服务器支持backlog的情况下,需设置一个合理的大小 5.设置一个最小的入站数据传输速率 渗透状况: 安全扫描+手工测试. 漏洞原理: 扫描发现Web 服务器或应用程序服务器存在Slow HTTP Denial of Service Attack漏洞. 漏洞危害: 当恶意攻击者以很低的速率发起HTTP请求,使得服务端长期保持连接,这样使得服务端容易造成占用所有可…

DDoS:Distributed Denial of Service,即分布式拒绝服务攻击. 借助于客户/服务器技术,将多个计算机联合起来作为攻击平台,对一个或多个目标发动DDoS攻击,从而成倍地提高拒绝服务攻击的威力. 通常,攻击者使用一个偷窃帐号将DDoS主控程序安装在一个计算机上,在一个设定的时间主控程序将与大量代理程序通讯,代理程序已经被安装在网络上的许多计算机上. 代理程序收到指令时就发动攻击.利用客户/服务器技术,主控程序能在几秒钟内激活成百上千次代理程序的运行. DDoS攻击通过大…

The invention provides methods, apparatus and systems for detecting distributed denial of service (DDoS) attacks within the Internet by sampling packets at a point or points in Internet backbone connections to determine a packet metric parameter. The…

Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The function prototype should be…

今天在使用bootstrap的时候引入的js文件出现错误Syntax error on token "Invalid Regular Expression Options", no accurate correc: 大概意思就是无效的表达式什么的,具体解决方法如下: 1.选中报错的js文件或报错内容.2.右键选择 MyEclipse-->Exclude From Validation .3.再右键选择 MyEclipse-->Run Validation 即可. 本文参照h…

Implement regular expression matching with support for '.' and '*'. DP: public class Solution { public boolean isMatch2(String s, String p) { int starCnt = 0; for (int i = 0; i < p.length(); i++) { if (p.charAt(i) == '*') { starCnt++; } } boolean[] s…

问题: Implement regular expression matching with support for '.' and '*'.'.' Matches any single character.'*' Matches zero or more of the preceding element.The matching should cover the entire input string (not partial). 官方难度: Hard 翻译: 实现正则表达式匹配字符串,支持特…

Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The function prototype should be…

Regular Expression Matching Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The…

Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The function prototype should be…

.grep -iwr --color 'hellp' /home/weblogic/demo 或者 grep -iw --color 'hellp' /home/weblogic/demo/* (-i (忽略大小写) 和 --color 选项参数 仅仅只是要匹配单词,可以加上 -w 选项参数) 2.grep -iwr --color 'hellp\|hello' /home/weblogic/demo 或者 grep -iw --color 'hellp\|hello' /home/weblog…

Regular Expression Matching Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The…

位置:Post-Processors - Regular Expression Extractor 所谓的Post-Processors直译为后处理器,意思是在域内所有Sampler执行完后才会执行,所以如果你想只对某个Sampler生效的话,那就加成子对象 这个组件可以用来做关联,非常有用 Apply to,作用域,主要作用在于是否作用在sub-sampler Field to check,分的很细,意思是你打算去哪里取值 Reference Name,变量名,取值后存储的对象名,可以用作${…

RegexKit RegexKit: A Regular Expression Toolbox Based On NW.js(Node-Webkit) And Other Greate Open Source Projects. Dependence RegexKit is based on a series of greate open source projects. NW.js: NW.js Express.js: express.js Regex101: regex101.com Reg…

1. Using the new RegExp() constructor // constructor var re = new RegExp("\\\\", "gm"); 2. Using the regular expression literal // regular expression literal var re = /\\/gm;  when using the RegExp()constructor, you also need to escape…

Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The function prototype should be…

Regular Expression Matching Implement regular expression matching with support for '.' and '*'. '.' Matches any single character.'*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The f…

Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The function prototype should be…

Today I also used Sed to do some relatively complex job. So I used regular expression. However, the expression in Sed is a little bit different from normal Regexp, especially the "(". There is no need to write it as "\(", the solely &q…

10. Regular Expression Matching Total Accepted: 89193 Total Submissions: 395441 Difficulty: Hard Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element.…

Some of my friends ask me a question: "Does FTK index search support regular expression?" They just participated in FTK Bootcamp last month, and they're trying to spend more time with FTK now. The answer is "Yes". FTK index search supp…

题目: Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The function prototype shoul…

1 match = re.search(pat,str)  If the search is successful, search() returns a match object or None otherwise. The code match = re.search(pat, str) stores the search result in a variable named "match". Then the if-statement tests the match -- if…

题意: Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The function prototype shoul…

Spring EL supports regular expression using a simple keyword "matches", which is really awesome! For examples, @Value("#{'100' matches '\\d+' }") private boolean isDigit; It test whether '100' is a valid digit via regular expression '\…

题目描述: Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. 解题思路: 这道题如果只考虑“.”的话其实很好完成,所以解题的关键在于处理“*”的情况.以为“*”与前一个字母有关,所以应该整体考虑ch*……的情况.ch*可以匹配0-n个s的字符串…