Multiple vulnerabilities in PowerDNS
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2020-10995 CVE-2020-12244 CVE-2020-10030 |
| CWE-ID | CWE-20 CWE-125 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
PowerDNS Recursor Server applications / DNS servers |
| Vendor | PowerDNS.COM B.V. |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Input validation error
EUVDB-ID: #VU28141
Risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2020-10995
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input when processing DNS responses. A remote attacker who controls a malicious DNS server can send a specially crafted response and perform a denial of service (DoS) attack against third-party DNS servers.
The attack is triggered by random subdomains in the NSDNAME in NS records.
MitigationInstall updates from vendor's website.
Vulnerable software versionsPowerDNS Recursor: 4.1.0 rc1 - 4.3.0
CPE2.3- cpe:2.3:a:powerdns_com_b_v:powerdns_recursor:4.1.15:*:*:*:*:*:*:*
- cpe:2.3:a:powerdns_com_b_v:powerdns_recursor:4.2.1:*:*:*:*:*:*:*
- cpe:2.3:a:powerdns_com_b_v:powerdns_recursor:4.3.0:*:*:*:*:*:*:*
https://www.nxnsattack.com
https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-01.html
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.
2) Input validation error
EUVDB-ID: #VU28142
Risk: Medium
CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2020-12244
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a spoofing attack.
The vulnerability exists due to records in the answer section of a NXDOMAIN response lacking an SOA are not properly validated in SyncRes::processAnswer. A remote attacker with ability to perform a Man-in-the-Middle (MitM) attack can send a NXDOMAIN answer for a name that does exist and bypass DNSSEC validation.
Successful exploitation of the vulnerability may allow an attacker to perform a spoofing attack.
Install updates from vendor's website.
Vulnerable software versionsPowerDNS Recursor: 4.1.0 rc1 - 4.3.0
CPE2.3https://www.openwall.com/lists/oss-security/2020/05/19/3
https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-02.html
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.
3) Out-of-bounds read
EUVDB-ID: #VU28143
Risk: Low
CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2020-10030
CWE-ID:
CWE-125 - Out-of-bounds read
Exploit availability: No
DescriptionThe vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition when processing a hostname via the gethostname() function. A local user with ability to change system hostname can trigger out-of-bounds read error and read contents of memory on the system.
MitigationInstall update from vendor's website.
Vulnerable software versionsPowerDNS Recursor: 4.1.0 rc1 - 4.3.0
CPE2.3https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-03.html
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
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.
The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
