Question

我最近构建了一个全新的开发服务器，以便尝试Modsecurity。但是，我使用SignalR为客户端 - 服务器通信提供了很多由.NET 4应用程序生成的误报。

如何在不影响Modsecurity效率的情况下防止误报？

点击看起来非常通用，所以我不想完全禁用这些规则，我想避免禁用/signalr/ uri上的点击，这将失去对SignalR的保护。

以下是我继续进行设置的方法：

我安装了Windows Server 2012
已安装的IIS角色
已安装所有操作系统更新
通过WebPlatformInstaller安装ModSecurity IIS
创建网站和已部署的应用程序

以下是我得到的三个常见误报：

SQL身份验证绕过：

> [client 192.168.0.104:59945] ModSecurity: Warning. Pattern match
> "(?i:(?:in\\s*?\\(+\\s*?select)|(?:(?:n?and|x?x?or|div|like|between|and|not
> |\\|\\||\\&\\&)\\s+[\\s\\w+]+(?:regexp\\s*?\\(|sounds\\s+like\\s*?[\"'`\xc2\xb4\xe2\x80\x99\xe2\x80\x98]|[=\\d]+x))|([\"'`\xc2\xb4\xe2\x80\x99\xe2\x80\x98]\\s*?\\d\\s*?(?:--|#))
> ..." at ARGS:connectionData. [file "C:\/Program Files/ModSecurity
> IIS/owasp_crs/base_rules/modsecurity_crs_41_sql_injection_attacks.conf"]
> [line "239"] [id "981246"] [msg "Detects basic SQL authentication
> bypass attempts 3/3"] [data "Matched Data: \x22name\x22:\x22 found
> within ARGS:connectionData: [{\x22name\x22:\x22*****serverhub\x22}]"]
> [severity "CRITICAL"] [tag "OWASP_CRS/WEB_ATTACK/SQL_INJECTION"]
> [hostname "*********"] [uri
> "/signalr/start?transport=webSockets&clientProtocol=1.4&connectionToken=iIxfXzLxKm9twEhHdomj4DI95so0QmpmqeTXD4Qe0VsQoJO47CHuEIuv2z7M%2B1TYx44PK5ko18t2aoaLb4WztjR1c8g0VP8MUaGkSO9KDftOzsGektSIDl%2FI1RPMQdTd&connectionData=%5B%7B%22name%22%3A%22*****serverhub%22%7D%5D&_=1461637088340"]
> [unique_id "17798225729515683844"]

受限制的SQL字符：

> [client 192.168.0.104:59945] ModSecurity: Warning. Pattern match
> "([\\~\\!\\@\\#\\$\\%\\^\\&\\*\\(\\)\\-\\+\\=\\{\\}\\[\\]\\|\\:\\;\"\\'\\\xc2\xb4\\\xe2\x80\x99\\\xe2\x80\x98\\`\\<\\>].*?){4,}"
> at ARGS:connectionData. [file "C:\/Program Files/ModSecurity
> IIS/owasp_crs/base_rules/modsecurity_crs_41_sql_injection_attacks.conf"]
> [line "159"] [id "981173"] [rev "2"] [msg "Restricted SQL Character
> Anomaly Detection Alert - Total # of special characters exceeded"]
> [data "Matched Data: \x22 found within ARGS:connectionData:
> [{\x22name\x22:\x22*****serverhub\x22}]"] [ver "OWASP_CRS/2.2.9"]
> [maturity "9"] [accuracy "8"] [tag
> "OWASP_CRS/WEB_ATTACK/SQL_INJECTION"] [hostname "*********"] [uri
> "/signalr/start?transport=webSockets&clientProtocol=1.4&connectionToken=iIxfXzLxKm9twEhHdomj4DI95so0QmpmqeTXD4Qe0VsQoJO47CHuEIuv2z7M%2B1TYx44PK5ko18t2aoaLb4WztjR1c8g0VP8MUaGkSO9KDftOzsGektSIDl%2FI1RPMQdTd&connectionData=%5B%7B%22name%22%3A%22*****serverhub%22%7D%5D&_=1461637088340"]
> [unique_id "17798225729515683844"]

缺少接受标题：

> [client 192.168.0.104:59949] ModSecurity: Warning. Operator EQ matched
> 0 at REQUEST_HEADERS. [file "C:\/Program Files/ModSecurity
> IIS/owasp_crs/base_rules/modsecurity_crs_21_protocol_anomalies.conf"]
> [line "47"] [id "960015"] [rev "1"] [msg "Request Missing an Accept
> Header"] [severity "NOTICE"] [ver "OWASP_CRS/2.2.9"] [maturity "9"]
> [accuracy "9"] [tag
> "OWASP_CRS/PROTOCOL_VIOLATION/MISSING_HEADER_ACCEPT"] [tag
> "WASCTC/WASC-21"] [tag "OWASP_TOP_10/A7"] [tag "PCI/6.5.10"] [hostname
> "*********"] [uri
> "/signalr/connect?transport=webSockets&clientProtocol=1.4&connectionToken=iIxfXzLxKm9twEhHdomj4DI95so0QmpmqeTXD4Qe0VsQoJO47CHuEIuv2z7M%2B1TYx44PK5ko18t2aoaLb4WztjR1c8g0VP8MUaGkSO9KDftOzsGektSIDl%2FI1RPMQdTd&connectionData=%5B%7B%22name%22%3A%22*****serverhub%22%7D%5D&tid=6"]
> [unique_id "17726168135477755906"]

PS：我没有在该特定应用程序中使用任何SQL技术。

Answer 1

对于前两个，我建议你添加以下规则来忽略这些规则的ConnectionData参数：

 SecRuleUpdateTargetById 981246 !ARGS:'ConnectionData'
 SecRuleUpdateTargetById 981173 !ARGS:'ConnectionData'

最后我建议完全删除该规则。我发现它不是很有用，因为有些浏览器（在内存中的Android上）不会发送该标题：

SecRuleRemoveById 960015

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