Thekelleys dnsmasq up to 2.32 tftp.c tftp_request 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.
6.6	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Thekelleys dnsmasq up to 2.32. This vulnerability affects the function tftp_request of the file tftp.c. Such manipulation leads to memory corruption. This vulnerability is listed as CVE-2009-2957. In addition, an exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Thekelleys dnsmasq up to 2.32 (Domain Name Software). It has been rated as critical. Affected by this issue is the function tftp_request of the file tftp.c. 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. CVE summarizes:

Heap-based buffer overflow in the tftp_request function in tftp.c in dnsmasq before 2.50, when --enable-tftp is used, might allow remote attackers to execute arbitrary code via a long filename in a TFTP packet, as demonstrated by a read (aka RRQ) request.

The weakness was presented 09/02/2009 by Core Security (Website). The advisory is available at securityfocus.com. This vulnerability is handled as CVE-2009-2957. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known.

A public exploit has been developed by Core Security and been published 1 weeks after the advisory. The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 67918 (Oracle Linux 5 : dnsmasq (ELSA-2009-1238)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 155834 (Oracle Enterprise Linux Update for dnsmasq (ELSA-2009-1238)).

Upgrading to version 2.33 eliminates this vulnerability. Attack attempts may be identified with Snort ID 1941. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 12125.

The vulnerability is also documented in the databases at X-Force (52973), Exploit-DB (9617), Tenable (67918), SecurityFocus (BID 36121†) and Vulnerability Center (SBV-23391†). See VDB-49779 for similar entry. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Domain Name Software

Vendor

• Thekelleys

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

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

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

CVSSv2info

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

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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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
Author: Core Security
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Nessus ID: 67918
Nessus Name: Oracle Linux 5 : dnsmasq (ELSA-2009-1238)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 64819
OpenVAS Name: Debian Security Advisory DSA 1876-1 (dnsmasq)
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: 🔍
Exploit Delay Time: 🔍

Upgrade: dnsmasq 2.33

Snort ID: 1941
Snort Message: PROTOCOL-TFTP GET filename overflow attempt
Snort Class: 🔍
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

SourceFire IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

08/24/2009 🔍
08/31/2009 +7 days 🔍
08/31/2009 +0 days 🔍
09/02/2009 +2 days 🔍
09/02/2009 +0 days 🔍
09/06/2009 +4 days 🔍
09/09/2009 +3 days 🔍
09/09/2009 +0 days 🔍
07/12/2013 +1402 days 🔍
03/18/2015 +614 days 🔍
09/28/2025 +3847 days 🔍

Sourcesinfo

Advisory: securityfocus.com⛔
Researcher: Core Security
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2009-2957 (🔍)
GCVE (CVE): GCVE-0-2009-2957
GCVE (VulDB): GCVE-100-49778

OVAL: 🔍

X-Force: 52973
SecurityFocus: 36121 - Dnsmasq TFTP Service Remote Heap Buffer Overflow Vulnerability
Vulnerability Center: 23391 - Dnsmasq <2.50 with --enable-tftp Used tftp.c Heap-Based Buffer Overflow Allows Remote Code Execution, High

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

Entryinfo

Created: 03/18/2015 15:15
Updated: 09/28/2025 05:10
Changes: 03/18/2015 15:15 (72), 02/13/2017 15:27 (19), 08/20/2021 20:11 (4), 08/20/2021 20:19 (1), 09/28/2025 05:10 (14)
Complete: 🔍
Cache ID: 216::103

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