An issue has been found in the parsing of authoritative answers in PowerDNS Recursor before 4.0.8, leading to a NULL pointer dereference when parsing a specially crafted answer containing a CNAME of a different class than IN. An unauthenticated remote attacker could cause a denial of service.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An issue has been found in the parsing of authoritative answers in PowerDNS Recursor before 4.0.8, leading     to a NULL pointer dereference when parsing a specially crafted answer containing a CNAME of a different     class than IN. An unauthenticated remote attacker could cause a denial of service. (CVE-2017-15120)

Note that Nessus relies on the presence of the package as reported by the vendor.

- Upstream released new version

  - Fix a bunch of CVE's

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.

According to its self-reported version number, the version of the PowerDNS Recursor listening on the remote host is version 4.0.x prior to 4.0.8. It is, therefore, affected by a denial of service vulnerability in the CNAME parser.

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.

This update for pdns-recursor fixes the following issues :

  - CVE-2017-15120: parsing error while handling     authoritative answers containing a CNAME of a different     class than IN, leading to a recursor crash via a NULL     pointer dereference. (boo#1072170)

Toshifumi Sakaguchi discovered that PowerDNS Recursor, a high-performance resolving name server was susceptible to denial of service via a crafted CNAME answer.

The oldstable distribution (jessie) is not affected.

ID	Name	Product	Family	Severity
246395	Linux Distros Unpatched Vulnerability : CVE-2017-15120	Nessus	Misc.	high
110520	Fedora 27 : pdns-recursor (2018-76c82b393e)	Nessus	Fedora Local Security Checks	medium
106195	PowerDNS Recursor 4.0.x < 4.0.8 CNAME Parser DoS (CVE-2017-15120)	Nessus	DNS	high
105365	openSUSE Security Update : pdns-recursor (openSUSE-2017-1395)	Nessus	SuSE Local Security Checks	high
105170	Debian DSA-4063-1 : pdns-recursor - security update	Nessus	Debian Local Security Checks	high

Detections

Analytics

CVE-2017-15120

high

Tenable Plugins

high

medium

high

high

high