Multiple vulnerabilities in PowerDNS



Published: 2020-05-20
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
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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

CVSSv3.1:

CVE-ID: CVE-2020-10995

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

PowerDNS Recursor: 4.3.0 - 4.3.0 rc2, 4.2.0 - 4.2.1, 4.1.0 - 4.1.15


CPE2.3 External links

http://www.nxnsattack.com
http://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-01.html

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

2) Input validation error

EUVDB-ID: #VU28142

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-12244

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

PowerDNS Recursor: 4.3.0 - 4.3.0 rc2, 4.2.0 - 4.2.1, 4.1.0 - 4.1.15


CPE2.3 External links

http://www.openwall.com/lists/oss-security/2020/05/19/3
http://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-02.html

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

3) Out-of-bounds read

EUVDB-ID: #VU28143

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2020-10030

CWE-ID: CWE-125 - Out-of-bounds Read

Exploit availability: No

Description

The 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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

PowerDNS Recursor: 4.3.0 - 4.3.0 rc2, 4.2.0 - 4.2.1, 4.1.0 - 4.1.15


CPE2.3 External links

http://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-03.html

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?



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