When api-config-dir is set to a non-empty value, which is not the case by default, the API in PowerDNS Recursor 4.x up to and including 4.0.6 and 3.x up to and including 3.7.4 allows an authorized user to update the Recursor's ACL by adding and removing netmasks, and to configure forward zones. It was discovered that the new netmask and IP addresses of forwarded zones were not sufficiently validated, allowing an authenticated user to inject new configuration directives into the Recursor's configuration.

According to its self-reported version number, the version of the PowerDNS Recursor listening on the remote host is prior to to 4.0.7.
It is, therefore, affected by a vulnerability where a remote authenticated user can injection additional configuration directives via the API.

Note that Nessus has not attempted to exploit these issues but has instead relied only on the application's self-reported version number.
Also, Nessus has not checked for the presence of the patch.

Update to latest version. Contains security fixes for CVE-2017-15090, CVE-2017-15092, CVE-2017-15093 and CVE-2017-15094

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for pdns-recursor fixes the following issues :

Security issues fixed :

  - CVE-2017-15090: An issue has been found in the DNSSEC     validation component of PowerDNS Recursor, where the     signatures might have been accepted as valid even if the     signed data was not in bailiwick of the DNSKEY used to     sign it. This allows an attacker in position of     man-in-the-middle to alter the content of records by     issuing a valid signature for the crafted records     (boo#1069242).

  - CVE-2017-15092: An issue has been found in the web     interface of PowerDNS Recursor, where the qname of DNS     queries was displayed without any escaping, allowing a     remote attacker to inject HTML and JavaScript code into     the web interface, altering the content (boo#1069242).

  - CVE-2017-15093: When `api-config-dir` is set to a     non-empty value, which is not the case by default, the     API allows an authorized user to update the Recursor's     ACL by adding and removing netmasks, and to configure     forward zones. It was discovered that the new netmask     and IP addresses of forwarded zones were not     sufficiently validated, allowing an authenticated user     to inject new configuration directives into the     Recursor's configuration (boo#1069242).

  - CVE-2017-15094: An issue has been found in the DNSSEC     parsing code of PowerDNS Recursor during a code audit by     Nixu, leading to a memory leak when parsing specially     crafted DNSSEC ECDSA keys (boo#1069242).

ID	Name	Product	Family	Severity
106194	PowerDNS Recursor < 4.0.7 API Configuration Injection Vulnerability (CVE-2017-15093)	Nessus	DNS	medium
105888	Fedora 27 : pdns-recursor (2017-608b6f5945)	Nessus	Fedora Local Security Checks	medium
105229	openSUSE Security Update : pdns-recursor (openSUSE-2017-1339)	Nessus	SuSE Local Security Checks	medium
105203	Fedora 25 : pdns-recursor (2017-81fe39ad9f)	Nessus	Fedora Local Security Checks	medium
105198	Fedora 26 : pdns-recursor (2017-1585789772)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2017-15093

medium

Tenable Plugins

medium

medium

medium

medium

medium