SB2020021407 - Remote code execution in Draytek Vigor 2960, 3900 and 300B
Published: February 14, 2020 Updated: September 14, 2022
Security Bulletin ID
SB2020021407
Severity
Critical
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Neutralization of Special Elements in Output Used by a Downstream Component (CVE-ID: CVE-2020-8515)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to the affected devices allow remote code execution as root (without authentication) via shell metacharacters to the "cgi-bin/mainfunction.cgi" URI.
Note, this vulnerability is being actively exploited in the wild starting from December 4, 2019.
Remediation
Install update from vendor's website.
References
- https://sku11army.blogspot.com/2020/01/draytek-unauthenticated-rce-in-draytek.html
- https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-router-web-management-page-vulnerability-(cve-2020-8515)/
- https://blog.netlab.360.com/two-zero-days-are-targeting-draytek-broadband-cpe-devices-en/