Security restrictions bypass in PowerDNS Recursor
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2020-14196 |
| CWE-ID | CWE-284 |
| Exploitation vector | Network |
| Public exploit | Public exploit code for vulnerability #1 is available. |
| Vulnerable software Subscribe |
PowerDNS Recursor Server applications / DNS servers |
| Vendor | PowerDNS.COM B.V. |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Improper access control
EUVDB-ID: #VU29577
Risk: Medium
CVSSv3.1: 4.3 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C]
CVE-ID: CVE-2020-14196
CWE-ID:
CWE-284 - Improper Access Control
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to ACL applied to the internal web server via "webserver-allow-from" is not properly enforced. A remote attacker can send HTTP queries to the internal web server, bypassing the restriction.
Successful exploitation of the vulnerability requires that the the API webserver is enabled (not the default value).
Install updates from vendor's website.
Vulnerable software versionsPowerDNS Recursor: 4.1.0 - 4.3.1
External linkshttp://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-04.html
http://www.openwall.com/lists/oss-security/2020/07/01/1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
