– 自动刷SRC
w13scan的xss扫描功能进行优化
灵感注入xray所引起的基于语义的扫描技术。
xss扫描之前是w3afxss payload,通常在以下几个部分。
Xsstrike,Xray,Awvs中的检测技巧以及检测参数
XSStrike
先说说Xsstrike,里面带有xss扫描和fuzz,
DOM XSS
Xsstrike的dom扫描,是通过正则来分析敏感函数
sources = r'''document\.(URL|documentURI|URLUnencoded|baseURI|cookie|referrer)|location\.(href|search|hash|pathname)|window\.name|history\.(pushState|replaceState)(local|session)Storage'''
sinks = r'''eval|evaluate|execCommand|assign|navigate|getResponseHeaderopen|showModalDialog|Function|set(Timeout|Interval|Immediate)|execScript|crypto.generateCRMFRequest|ScriptElement\.(src|text|textContent|innerText)|.*?\.onEventName|document\.(write|writeln)|.*?\.innerHTML|Range\.createContextualFragment|(document|window)\.location'''
scripts = re.findall(r'(?i)(?s)<script[^>]*>(.*?)</script>', response)
通过将script脚本内的内容提取出来,通过一些正则来获取,最后输出。
准确度很低,只能用于辅助,不太适合自动化扫描
内置参数
它里面有内置一些参数,在检测时转化这些参数也一起发送
blindParams = [ # common paramtere names to be bruteforced for parameter discovery
'redirect', 'redir', 'url', 'link', 'goto', 'debug', '_debug', 'test', 'get', 'index', 'src', 'source', 'file',
'frame', 'config', 'new', 'old', 'var', 'rurl', 'return_to', '_return', 'returl', 'last', 'text', 'load', 'email',
'mail', 'user', 'username', 'password', 'pass', 'passwd', 'first_name', 'last_name', 'back', 'href', 'ref', 'data', 'input',
'out', 'net', 'host', 'address', 'code', 'auth', 'userid', 'auth_token', 'token', 'error', 'keyword', 'key', 'q', 'query', 'aid',
'bid', 'cid', 'did', 'eid', 'fid', 'gid', 'hid', 'iid', 'jid', 'kid', 'lid', 'mid', 'nid', 'oid', 'pid', 'qid', 'rid', 'sid',
'tid', 'uid', 'vid', 'wid', 'xid', 'yid', 'zid', 'cal', 'country', 'x', 'y', 'topic', 'title', 'head', 'higher', 'lower', 'width',
'height', 'add', 'result', 'log', 'demo', 'example', 'message']
很好的思路,后面我的扫描器中也使用了这一点
从乌云镜像XSS分类中提取出了top10参数
在扫描时也会将这些参数加上
HTML解析和分析反射
如果参数可以回显,
那么通过html解析就可以获得参数位置,分析回显的环境
(是否在html标签内,是否在html属性内,是否在注释中,是否在js中)
等等,否则来确定检测的payload。
后面我的扫描器的检测流程也是这样,
非常准确和效率,不过Xsstrike分析html是自己写的分析函数,
刚开始我也想直接用它的来着,但是这个函数内容过多,调试困难,代码也很难理解。
其实如果把html解析理解为html的语义分析,用python3自带的html提取函数很容易就能完成这一点。
Xray
XSStrike让我学习到了新一代xss扫描器应该如何编写,
但新一代xss扫描器的payload是在Xray上学到的。
由于Xray没有开源,所以就通过分析日志的方式来看它的工作原理。
<html>
<body>
<a href="?q=1&w=2&e=3&r=4&t=5" />
<script>
<php
foreach($_GET as $key => $value){
// $_GET[$key] = htmlspecialchars($value);
}
$q = $_GET["q"];
$w = $_GET["w"];
$e = $_GET["e"];
$r = $_GET["r"];
$t = $_GET["t"];
if(stripos($q,"prompt") > 0){
die("error");
}
$var = 'var a = "'.$q.'";';
echo $var;
>
</script>
<div>
<textarea><?php echo $w;?></textarea>
</div>
<input style="color:<?php echo $e;?>" value="<?php echo $r;?>"/>
<!--
this is comment
<?php echo $t;?>
-->
</body>
</html>
用来分别测试xss在script,style内,html标签内,注释这几种情况下xray的发包过程
对于在script的脚本内的回显内容,对于以下case
<script>
$var = 'var a = "'.$_GET['q'].'";';
echo $var;
</script>
X射线顺序发送了以下payload:pdrjzsqc,“-pdrjzsqc-”,
最后会给出payload,但这个包并没有发送。
后面把prompt作为关键词屏蔽,发现最后还是给出这个payload。
还有一种情况,在script中的注释中输出
<html>
<body>
<script>
var a = 11;
// inline <?php echo $_GET["a"];?>
/* <?php echo $_GET["b"];?> */
</script>
</body>
</html>
xray会发送
xray会发送
\n;chxdsdkm;//来判定,最后给出payload
\n;prompt(1);//
.对于在标签内的内容,针对以下case
<textarea><?php echo $_GET["w"];?></textarea>
xray顺序发送了以下payload
:spzzmsntfzikatuchsvu,,
当确定尖括号没有被过滤时,会继续发送以下payload:
sCrIpTjhymehqbkrScRiPt,
iMgSrCoNeRrOrjhymehqbkr>,
SvGoNlOaDjhymehqbkr>,
IfRaMeSrCjAvAsCrIpTjhymehqbkr>,
aHrEfJaVaScRiPtjhymehqbkrClIcKa,
iNpUtAuToFoCuSoNfOcUsjhymehqbkr>,
进行关键词的试探,最后给出payload为
对于在style里内容,以下case
<input style="color:<?php echo
xray顺序发送了以下payload:kmbrocvz,expression(a(kmbrocvz))
对于在html标签内的内容,以下case
<input style="color:3" value="<?php echo $_GET["r"];?>"/>
xray顺序发送了以下payload:
spzzmsntfzikatuchsvu,
“ljxxrwom=”,
‘ljxxrwom=’,
ljxxrwom=,当确认引号没有被过滤时,会继续发送以下payload:
">,
">ScRiPtvkvjfzrtgiScRiPt,
">ImGsRcOnErRoRvkvjfzrtgi>,
">SvGoNlOaDvkvjfzrtgi>,
">iFrAmEsRcJaVaScRiPtvkvjfzrtgi>,
">aHrEfJaVaScRiPtvkvjfzrtgicLiCkA,
">InPuTaUtOfOcUsOnFoCuSvkvjfzrtgi>,
" OnMoUsEoVeR=xviinqws,最后可以确定payload为
">,"OnMoUsEoVeR=prompt(1)//
如果针对此类case:
<img src=1 onerror="a<?php echo htmlspecialchars($_GET["a"]);?>" />
xray返回payload为prompt(1),
说明xray会把onerror后面的内容当作JavaScript脚本来执行,
如果把onerror改为onerror1,同样会返回prompt。
在awvs规则中也看到过类似的规则
parName == "ONAFTERPRINT" ||
parName == "ONBEFOREPRINT" ||
parName == "ONBEFOREONLOAD" ||
parName == "ONBLUR" ||
parName == "ONERROR" ||
parName == "ONFOCUS" ||
parName == "ONHASCHANGE" ||
parName == "ONLOAD" ||
parName == "ONMESSAGE" ||
parName == "ONOFFLINE" ||
parName == "ONONLINE" ||
parName == "ONPAGEHIDE" ||
parName == "ONPAGESHOW" ||
parName == "ONPOPSTATE" ||
parName == "ONREDO" ||
parName == "ONRESIZE" ||
parName == "ONSTORAGE" ||
parName == "ONUNDO" ||
parName == "ONUNLOAD" ||
parName == "ONBLUR" ||
parName == "ONCHANGE" ||
parName == "ONCONTEXTMENU" ||
parName == "ONFOCUS" ||
parName == "ONFORMCHANGE" ||
parName == "ONFORMINPUT" ||
parName == "ONINPUT" ||
parName == "ONINVALID" ||
parName == "ONRESET" ||
parName == "ONSELECT" ||
parName == "ONSUBMIT" ||
parName == "ONKEYDOWN" ||
parName == "ONKEYPRESS" ||
parName == "ONKEYUP" ||
parName == "ONCLICK" ||
parName == "ONDBLCLICK" ||
parName == "ONDRAG" ||
parName == "ONDRAGEND" ||
parName == "ONDRAGENTER" ||
parName == "ONDRAGLEAVE" ||
parName == "ONDRAGOVER" ||
parName == "ONDRAGSTART" ||
parName == "ONDROP" ||
parName == "ONMOUSEDOWN" ||
parName == "ONMOUSEMOVE" ||
parName == "ONMOUSEOUT" ||
parName == "ONMOUSEOVER" ||
parName == "ONMOUSEUP" ||
parName == "ONMOUSEWHEEL" ||
parName == "ONSCROLL" ||
parName == "ONABORT" ||
parName == "ONCANPLAY" ||
parName == "ONCANPLAYTHROUGH" ||
parName == "ONDURATIONCHANGE" ||
parName == "ONEMPTIED" ||
parName == "ONENDED" ||
parName == "ONERROR" ||
parName == "ONLOADEDDATA" ||
parName == "ONLOADEDMETADATA" ||
parName == "ONLOADSTART" ||
parName == "ONPAUSE" ||
parName == "ONPLAY" ||
parName == "ONPLAYING" ||
parName == "ONPROGRESS" ||
parName == "ONRATECHANGE" ||
parName == "ONREADYSTATECHANGE" ||
parName == "ONSEEKED" ||
parName == "ONSEEKING" ||
parName == "ONSTALLED" ||
parName == "ONSUSPEND" ||
parName == "ONTIMEUPDATE" ||
parName == "ONVOLUMECHANGE" ||
parName == "ONWAITING" ||
parName == "ONTOUCHSTART" ||
parName == "ONTOUCHMOVE" ||
parName == "ONTOUCHEND" ||
parName == "ONTOUCHENTER" ||
parName == "ONTOUCHLEAVE" ||
parName == "ONTOUCHCANCEL" ||
parName == "ONGESTURESTART" ||
parName == "ONGESTURECHANGE" ||
parName == "ONGESTUREEND" ||
parName == "ONPOINTERDOWN" ||
parName == "ONPOINTERUP" ||
parName == "ONPOINTERCANCEL" ||
parName == "ONPOINTERMOVE" ||
parName == "ONPOINTEROVER" ||
parName == "ONPOINTEROUT" ||
parName == "ONPOINTERENTER" ||
parName == "ONPOINTERLEAVE" ||
parName == "ONGOTPOINTERCAPTURE" ||
parName == "ONLOSTPOINTERCAPTURE" ||
parName == "ONCUT" ||
parName == "ONCOPY" ||
parName == "ONPASTE" ||
parName == "ONBEFORECUT" ||
parName == "ONBEFORECOPY" ||
parName == "ONBEFOREPASTE" ||
parName == "ONAFTERUPDATE" ||
parName == "ONBEFOREUPDATE" ||
parName == "ONCELLCHANGE" ||
parName == "ONDATAAVAILABLE" ||
parName == "ONDATASETCHANGED" ||
parName == "ONDATASETCOMPLETE" ||
parName == "ONERRORUPDATE" ||
parName == "ONROWENTER" ||
parName == "ONROWEXIT" ||
parName == "ONROWSDELETE" ||
parName == "ONROWINSERTED" ||
parName == "ONCONTEXTMENU" ||
parName == "ONDRAG" ||
parName == "ONDRAGSTART" ||
parName == "ONDRAGENTER" ||
parName == "ONDRAGOVER" ||
parName == "ONDRAGLEAVE" ||
parName == "ONDRAGEND" ||
parName == "ONDROP" ||
parName == "ONSELECTSTART" ||
parName == "ONHELP" ||
parName == "ONBEFOREUNLOAD" ||
parName == "ONSTOP" ||
parName == "ONBEFOREEDITFOCUS" ||
parName == "ONSTART" ||
parName == "ONFINISH" ||
parName == "ONBOUNCE" ||
parName == "ONBEFOREPRINT" ||
parName == "ONAFTERPRINT" ||
parName == "ONPROPERTYCHANGE" ||
parName == "ONFILTERCHANGE" ||
parName == "ONREADYSTATECHANGE" ||
parName == "ONLOSECAPTURE" ||
parName == "ONDRAGDROP" ||
parName == "ONDRAGENTER" ||
parName == "ONDRAGEXIT" ||
parName == "ONDRAGGESTURE" ||
parName == "ONDRAGOVER" ||
parName == "ONCLOSE" ||
parName == "ONCOMMAND" ||
parName == "ONINPUT" ||
parName == "ONCONTEXTMENU" ||
parName == "ONOVERFLOW" ||
parName == "ONOVERFLOWCHANGED" ||
parName == "ONUNDERFLOW" ||
parName == "ONPOPUPHIDDEN" ||
parName == "ONPOPUPHIDING" ||
parName == "ONPOPUPSHOWING" ||
parName == "ONPOPUPSHOWN" ||
parName == "ONBROADCAST" ||
parName == "ONCOMMANDUPDATE" ||
parName == "STYLE"
awvs会比较参数名称来确定。
在后面的自动化扫描中,发现这种方式的误报还是很高,
最后我将这种情况调整到了awvs的方式,
只检测指定的属性key。
从这两处细微的差异可以看到
awvs宁愿漏报也不误报,结果会很准确,
xray更多针对白帽子,结果会宽泛一些。
对于在html注释内的内容,以下case
<!--
this is comment
<?php echo $t;?>
-->
xray顺序发送了以下payload:
spzzmsntfzikatuchsvu,
–>,
–!>,
和上面类似,当确定–>或–!>没有过滤时,
会发送
以 --> 或 --!> 开头,添加如下内容
<bvwpmjtngz>
sCrIpTbvwpmjtngzsCrIpT
ImGsRcOnErRoRbvwpmjtngz>
sVgOnLoAdbvwpmjtngz>
iFrAmEsRcJaVaScRiPtbvwpmjtngz>
aHrEfJaVaScRiPtbvwpmjtngzcLiCkA
InPuTaUtOfOcUsOnFoCuSbvwpmjtngz>
Avvs
Awvs的扫描规则很多,针对的情况也很多,
没有仔细看它的工作方式是怎样的,
主要是看它的payload以及检测的情况,
和上面两种查漏补缺,最终合成了我的xss扫描器~
比如它会对meta标签的content内容进行处理,
会对你srcipt,src等tag的属性处理,
也有一些对AngularJs等一些流行的框架的XSS探测payload。。
我的扫描器
我的XSS扫描器就是综合上面的几种扫描器而来,
如果仔细观察,将会发现上面的扫描器的一些不同寻常的细节。
比如xray不会发送xss的payload,
都是用一些随机字符来代替,同时也会随机大小写对一些标签名称,属性名称等等。
这些精致的技巧吸取
扫描流程
我的扫描器扫描流程是这样的
发送随机flag -> 确定参数回显 ->
确定回显位置以及情况(html,js语法解析) ->
根据情况根据不同payload探测 -> 使用html,js语法解析确定是否多出来了标签,
属性,js语句等等
使用html语法树检测有很多优势,
可以准确判定回显所处的位置,然后通过发送一个随机payload,
例如,再使用语法检测是否有Asfaa这个标签,就能确定payload是否执行成功了。
html语法树用python自带的库
from html.parser import HTMLParser
js检测也是如此,
如果回显内容在JavaScript脚本中,发送随机flag后,
通过js语法解析只需要确定Identifier和Literal这两个类型中是否包含,
如果flag是Identifier类型,就能直接判断存在xss,
payload是alert(1)//,
如果flag是Literal类型,再通过单双引号来闭合进行检测。
Debug之旅
本地靶机测试后就对在线的靶机进行了测试 https://brutelogic.com.br/knoxss.html
查漏补缺后就就开始了自动化扫描。
整个自动化架构如下
1. 提供url ->
爬虫爬取 ->
参数入库 ->
消息队列 ->
xss扫描器 ->
子域名入库->
url入库
1.爬虫使用的crawlergo,效果挺不错的,但还是不太满足我的需求(造轮子的心态又膨胀了)
2.数据库使用的mongodb
3.用celery分散调用,由于用到了celery,又用到了rabbitmq消息编码,鲜花监控
4.用了服务器酱进行微信推送(得到一个扩展微信就会响一次)
优化了检测逻辑,加入了去重处理后,现在既扫描的慢且推动的消息也变少了
经过缩短对src的扫描后,成功还是挺多的(很多都归功于爬虫)