Dnsmasq up to 2.77 DNS Response memory corruption

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.2	$0-$5k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in Dnsmasq up to 2.77. This affects an unknown part of the component DNS Response Handler. The manipulation leads to memory corruption. This vulnerability is uniquely identified as CVE-2017-14491. The attack is possible to be carried out remotely. Moreover, an exploit is present. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Dnsmasq up to 2.77 (Domain Name Software). This issue affects some unknown functionality of the component DNS Response Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Heap-based buffer overflow in dnsmasq before 2.78 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a crafted DNS response.

The bug was discovered 10/02/2017. The weakness was disclosed 10/04/2017 by Felix Wilhelm with Google Security Team (Website). The advisory is shared at mail-archive.com. The identification of this vulnerability is CVE-2017-14491 since 09/15/2017. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but a public exploit is available.

The exploit is available at exploit-db.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 103604 (Amazon Linux AMI : dnsmasq (ALAS-2017-907)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Amazon Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 351105 (Amazon Linux Security Advisory for dnsmasq: ALAS-2017-907).

Upgrading to version 2.78 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 databases at Exploit-DB (42941), Tenable (103604) and SecurityFocus (BID 101085†). The entries VDB-29890, VDB-107351, VDB-107354 and VDB-107355 are pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Domain Name Software

Name

• Dnsmasq

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21
• 2.22
• 2.23
• 2.24
• 2.25
• 2.26
• 2.27
• 2.28
• 2.29
• 2.30
• 2.31
• 2.32
• 2.33
• 2.34
• 2.35
• 2.36
• 2.37
• 2.38
• 2.39
• 2.40
• 2.41
• 2.42
• 2.43
• 2.44
• 2.45
• 2.46
• 2.47
• 2.48
• 2.49
• 2.50
• 2.51
• 2.52
• 2.53
• 2.54
• 2.55
• 2.56
• 2.57
• 2.58
• 2.59
• 2.60
• 2.61
• 2.62
• 2.63
• 2.64
• 2.65
• 2.66
• 2.67
• 2.68
• 2.69
• 2.70
• 2.71
• 2.72
• 2.73
• 2.74
• 2.75
• 2.76
• 2.77

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.2

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 103604
Nessus Name: Amazon Linux AMI : dnsmasq (ALAS-2017-907)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 53754
OpenVAS Name: Debian Security Advisory DSA 3989-1 (dnsmasq - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Dnsmasq 2.78
Patch: 0549c73b7ea6b22a3c49beb4d432f185a81efcbc

Timelineinfo

09/15/2017 🔍
10/02/2017 +17 days 🔍
10/02/2017 +0 days 🔍
10/02/2017 +0 days 🔍
10/03/2017 +1 days 🔍
10/03/2017 +0 days 🔍
10/04/2017 +1 days 🔍
10/04/2017 +0 days 🔍
01/15/2025 +2660 days 🔍

Sourcesinfo

Advisory: RHSA-2017:2836
Researcher: Felix Wilhelm
Organization: Google Security Team
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-14491 (🔍)
GCVE (CVE): GCVE-0-2017-14491
GCVE (VulDB): GCVE-100-107417

OVAL: 🔍

CERT: 🔍
SecurityFocus: 101085 - Dnsmasq VU#973527 Multiple Security Vulnerabilities
SecurityTracker: 1039474

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 10/04/2017 10:29
Updated: 01/15/2025 02:39
Changes: 10/04/2017 10:29 (77), 11/21/2019 16:45 (9), 01/15/2021 11:07 (2), 12/30/2022 15:53 (5), 12/26/2024 22:06 (15), 01/15/2025 02:39 (1)
Complete: 🔍
Cache ID: 216:861:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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