# 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 協議（也使用數據壓縮）通過連接對秘密 Web Cookie 進行安全性攻擊的方法. 當用于恢復秘密身份驗證 Cookie 的內容時，它允許攻擊者在經過身份驗證的 Web 會話上執行會話劫持，從而允許發起進一步的攻擊.
## Description[](#description "Permalink")
TLS 協議 CRIME 漏洞影響使用 HTTPS 進行數據壓縮的系統. 如果使用 SSL 壓縮（例如 Gzip）或 SPDY（可以選擇使用壓縮），則系統可能容易受到 CRIME 漏洞的攻擊.
GitLab 支持 Gzip 和[SPDY，](http://nginx0org.icopy.site/en/docs/http/ngx_http_spdy_module.html)并通過在啟用 HTTPS 時禁用 Gzip 來緩解 CRIME 漏洞. 文件的來源在這里：
* [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)
盡管在 Omnibus 安裝中啟用了 SPDY，但 CRIME 依賴于壓縮（" C"），NGINX 的 SPDY 模塊中的默認壓縮級別為 0（無壓縮）.
## Nessus[](#nessus "Permalink")
Nessus 掃描儀[報告](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) ，類似于以下格式：
```
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.
```
從上面的報告中，需要特別注意的是，Nessus 僅檢查 TLS 是否在版本 4 之前發布了 SPDY 協議.它不執行攻擊，也不檢查是否啟用了壓縮. 僅 Nessus 掃描程序無法告知 SPDY 的壓縮已禁用并且不受 CRIME 漏洞的影響.
## 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. ["傳輸層安全性（TLS）協議 CRIME 漏洞"](https://www.tenable.com/plugins/index.php?view=single&id=62565)
* Wikipedia 的貢獻者， [" CRIME"](https://en.wikipedia.org/wiki/CRIME) Wikipedia，免費的百科全書
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