VDB-123797 · CVE-2016-7072 · Qualys 175940

PowerDNS Authoritative Server up to 3.4.10/4.0.1 Web Server TCP Connection resource consumption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.0$0-$5k0.00

A vulnerability, which was classified as problematic, has been found in PowerDNS Authoritative Server up to 3.4.10/4.0.1 (Domain Name Software). This issue affects some unknown functionality of the component Web Server. The manipulation as part of a TCP Connection leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

An issue has been found in PowerDNS Authoritative Server before 3.4.11 and 4.0.2 allowing a remote, unauthenticated attacker to cause a denial of service by opening a large number of TCP connections to the web server. If the web server runs out of file descriptors, it triggers an exception and terminates the whole PowerDNS process. While it's more complicated for an unauthorized attacker to make the web server run out of file descriptors since its connection will be closed just after being accepted, it might still be possible.

The bug was discovered 12/15/2016. The weakness was disclosed 09/10/2018 as not defined bug report (Bugzilla). The advisory is shared at bugzilla.redhat.com. The identification of this vulnerability is CVE-2016-7072 since 08/23/2016. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 44 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 96849 (Fedora 25 : pdns (2017-cbd5501d31)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 175940 (Debian Security Update for pdns (DSA 3764-1)).

Upgrading to version 3.4.11 or 4.0.2 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (96849). The entries 123888, 123891, 123892 and 126386 are pretty similar.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 6.0

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 5.3
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 96849
Nessus Name: Fedora 25 : pdns (2017-cbd5501d31)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for pdns FEDORA-2017-cbd5501d31
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Authoritative Server 3.4.11/4.0.2

Timelineinfo

08/23/2016 🔍
12/15/2016 +114 days 🔍
01/27/2017 +43 days 🔍
01/30/2017 +2 days 🔍
09/10/2018 +587 days 🔍
09/10/2018 +0 days 🔍
09/11/2018 +1 days 🔍
05/08/2023 +1700 days 🔍

Sourcesinfo

Advisory: FEDORA-2017-cbd5501d31
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-7072 (🔍)
OVAL: 🔍
See also: 🔍

Entryinfo

Created: 09/11/2018 06:56
Updated: 05/08/2023 08:12
Changes: 09/11/2018 06:56 (77), 03/22/2020 09:27 (2), 05/08/2023 08:11 (14), 05/08/2023 08:12 (1)
Complete: 🔍
Cache ID: 3:899:103

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