SB2020062702 - Multiple vulnerabilities in DrayTek Vigor3900, Vigor2960, and Vigor300B
Published: June 27, 2020 Updated: September 30, 2024
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Code Injection (CVE-ID: CVE-2020-14472)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
2) Stack-based buffer overflow (CVE-ID: CVE-2020-14473)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error. A remote unauthenticated attacker can trigger a stack-based buffer overflow and execute arbitrary code on the target system or perform a denial of service (DoS) attack.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
3) Stack-based buffer overflow (CVE-ID: CVE-2020-14993)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing data passed via the formuserphonenumber parameter in an authusersms action to mainfunction.cgi . A remote non-authenticated user can send a specially crafted request to the affected device, trigger a stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
PoC:
curl -d "action=authusersms&custom1=1;&custom2=1&custom3=1&formuserphonenumber=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\xEC\xC7\x01&URL=www.baidu.com&HOST=123456897&serverip=";ls;echo 'pwn it';&filename=pwn" -X POST http://192.168.0.250/cgi-bin/mainfunciton.cgi4) OS Command Injection (CVE-ID: CVE-2020-15415)
The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.
The vulnerability exists due to improper input validation within the "cgi-bin/mainfunction.cgi/cvmcfgupload" script. A remote unauthenticated attacker can send specially crafted HTTP request to the device and execute arbitrary OS commands on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Remediation
Install update from vendor's website.
References
- https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-remote-code-injection/execution-vulnerability-(cve-2020-14472)
- https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-stack-based-buffer-overflow-vulnerability-(cve-2020-14473)
- https://github.com/dexterone/Vigor-poc
- https://github.com/CLP-team/Vigor-Commond-Injection
- https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-remote-code-injection/execution-vulnerability-(cve-2020-14472)/