DrayTek Vigor2960/Vigor3900/Vigor300B cgi-bin/mainfunction.cgi Shell Metacharacter Remote Code Execution
| CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
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Current Exploit Price (β)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
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9.8 |
$25k-$100k | 10.00- |
A vulnerability was found in DrayTek Vigor2960, Vigor3900 and Vigor300B (unknown version). It has been rated as very critical. This issue affects an unknown code of the file cgi-bin/mainfunction.cgi. The manipulation as part of a Shell Metacharacter leads to a privilege escalation vulnerability (Code Execution). Using CWE to declare the problem leads to CWE-269. Impacted is confidentiality, integrity, and availability. The summary by CVE is:
DrayTek Vigor2960 1.3.1_Beta; Vigor3900 1.4.4_Beta; and Vigor300B 1.3.3_Beta, 1.4.2.1_Beta, and 1.4.4_Beta devices allow remote code execution as root (without authentication) via shell metacharacters to the cgi-bin/mainfunction.cgi URI.
The weakness was published 02/01/2020. The identification of this vulnerability is CVE-2020-8515 since 02/01/2020. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $25k-$100k at the moment (estimation calculated on 02/03/2020).
We expect the 0-day to have been worth approximately $100k and more.
There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.
Product
Vendor
- DrayTek
Name
- Vigor300B
- Vigor2960
- Vigor3900
CPE 2.3
- π
- π
- π
CPE 2.2
- π
- π
- π
CVSSv3
VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.8
VulDB Base Score: 9.8
VulDB Temp Score: 9.8
VulDB Vector: π
VulDB Reliability: π
CVSSv2
| AV | AC | Au | C | I | A |
|---|---|---|---|---|---|
| π | π | π | π | π | π |
| π | π | π | π | π | π |
| π | π | π | π | π | π |
| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
|---|---|---|---|---|---|
| unlock | unlock | unlock | unlock | unlock | unlock |
| unlock | unlock | unlock | unlock | unlock | unlock |
| unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: π
VulDB Temp Score: π
VulDB Reliability: π
Exploiting
Class: Privilege escalation / Code Execution (CWE-269)
Local: No
Remote: Yes
Availability: π
Status: Not defined
Price Prediction: π
Current Price Estimation: π
| 0-Day | unlock | unlock | unlock | unlock |
|---|---|---|---|---|
| Today | unlock | unlock | unlock | unlock |
Threat Intelligence
Threat: π
Adversaries: π
Geopolitics: π
Economy: π
Predictions: π
Remediation: π
Countermeasures
Recommended: no mitigation known
0-Day Time: π
Timeline
02/01/2020 Advisory disclosed
02/01/2020 CVE assigned
02/03/2020 VulDB entry created
02/03/2020 VulDB last update
Sources
CVE: CVE-2020-8515 (π)
Entry
Created: 02/03/2020 07:56 AM
Complete: π
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