# How we manage the TLS protocol CRIME vulnerability
> 原文：[https://docs.gitlab.com/ee/security/crime_vulnerability.html](https://docs.gitlab.com/ee/security/crime_vulnerability.html)
* [Description](#description)
* [Nessus](#nessus)
* [References](#references)
# How we manage the TLS protocol CRIME vulnerability[](#how-we-manage-the-tls-protocol-crime-vulnerability "Permalink")
[CRIME](https://en.wikipedia.org/w/index.php?title=CRIME&oldid=692423806)是利用 HTTPS 和 SPDY 协议（也使用数据压缩）通过连接对秘密 Web Cookie 进行安全性攻击的方法. 当用于恢复秘密身份验证 Cookie 的内容时，它允许攻击者在经过身份验证的 Web 会话上执行会话劫持，从而允许发起进一步的攻击.
## Description[](#description "Permalink")
TLS 协议 CRIME 漏洞影响使用 HTTPS 进行数据压缩的系统. 如果使用 SSL 压缩（例如 Gzip）或 SPDY（可以选择使用压缩），则系统可能容易受到 CRIME 漏洞的攻击.
GitLab 支持 Gzip 和[SPDY，](http://nginx0org.icopy.site/en/docs/http/ngx_http_spdy_module.html)并通过在启用 HTTPS 时禁用 Gzip 来缓解 CRIME 漏洞. 文件的来源在这里：
* [Source installation NGINX file](https://gitlab.com/gitlab-org/gitlab/blob/master/lib/support/nginx/gitlab-ssl)
* [Omnibus installation NGINX file](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/files/gitlab-cookbooks/gitlab/templates/default/nginx-gitlab-http.conf.erb)
尽管在 Omnibus 安装中启用了 SPDY，但 CRIME 依赖于压缩（" C"），NGINX 的 SPDY 模块中的默认压缩级别为 0（无压缩）.
## Nessus[](#nessus "Permalink")
Nessus 扫描仪[报告](https://www.tenable.com/plugins/index.php?view=single&id=62565) GitLab 中[可能存在的 CRIME 漏洞](https://www.tenable.com/plugins/index.php?view=single&id=62565) ，类似于以下格式：
```
Description
This remote service has one of two configurations that are known to be required for the CRIME attack:
SSL/TLS compression is enabled.
TLS advertises the SPDY protocol earlier than version 4.
...
Output
The following configuration indicates that the remote service may be vulnerable to the CRIME attack:
SPDY support earlier than version 4 is advertised.
```
从上面的报告中，需要特别注意的是，Nessus 仅检查 TLS 是否在版本 4 之前发布了 SPDY 协议.它不执行攻击，也不检查是否启用了压缩. 仅 Nessus 扫描程序无法告知 SPDY 的压缩已禁用并且不受 CRIME 漏洞的影响.
## References[](#references "Permalink")
* NGINX [“Module ngx_http_spdy_module”](http://nginx0org.icopy.site/en/docs/http/ngx_http_spdy_module.html)
* Tenable Network Security，Inc. ["传输层安全性（TLS）协议 CRIME 漏洞"](https://www.tenable.com/plugins/index.php?view=single&id=62565)
* Wikipedia 的贡献者， [" CRIME"](https://en.wikipedia.org/wiki/CRIME) Wikipedia，免费的百科全书
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