CVE-2011-0520

Debian Security Advisory 2196-1

Severity Score

9.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The compress_add_dlabel_points function in dns/Compress.c in MaraDNS 1.4.03, 1.4.05, and probably other versions allows remote attackers to cause a denial of service (segmentation fault) and possibly execute arbitrary code via a long DNS hostname with a large number of labels, which triggers a heap-based buffer overflow.

La función compress_add_dlabel_points en dns/Compress.c de MaraDNS v1.4.03, v1.4.05 y puede que otras versiones, permite a atacantes remotos provocar una denegación de servicio (fallo de segmentación) y posibilidad de ejecutar código de su elección a través de un nombre de DNS largo con un largo número de etiquetas, esto provoca un desbordamiento de búfer basado en memoria dinámica.

Witold Baryluk discovered that MaraDNS, a simple security-focused Domain Name Service server, may overflow an internal buffer when handling requests with a large number of labels, causing a server crash and the consequent denial of service.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2011-01-20 CVE Reserved
2011-01-28 CVE Published
2024-08-06 CVE Updated
2025-07-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

CAPEC

References (10)

URL	Tag	Source
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=610834	X_refsource_confirm
http://osvdb.org/70630	Vdb Entry
http://secunia.com/advisories/43107	Third Party Advisory
http://www.openwall.com/lists/oss-security/2011/01/24/1	Mailing List
http://www.openwall.com/lists/oss-security/2011/01/24/6	Mailing List
http://www.securityfocus.com/bid/45966	Vdb Entry
http://www.vupen.com/english/advisories/2011/0699	Vdb Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/64885	Vdb Entry

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://secunia.com/advisories/43027	2017-08-17
http://www.debian.org/security/2011/dsa-2196	2017-08-17

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Maradns Search vendor "Maradns"		Maradns Search vendor "Maradns" for product "Maradns"				1.4.03 Search vendor "Maradns" for product "Maradns" and version "1.4.03"		-		Affected
Maradns Search vendor "Maradns"		Maradns Search vendor "Maradns" for product "Maradns"				1.4.05 Search vendor "Maradns" for product "Maradns" and version "1.4.05"		-		Affected