CVE-2016-6559

The BSD libc library's link_ntoa() function may be vulnerable to a classic buffer overflow

Severity Score

9.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Improper bounds checking of the obuf variable in the link_ntoa() function in linkaddr.c of the BSD libc library may allow an attacker to read or write from memory. The full impact and severity depends on the method of exploit and how the library is used by applications. According to analysis by FreeBSD developers, it is very unlikely that applications exist that utilize link_ntoa() in an exploitable manner, and the CERT/CC is not aware of any proof of concept. A blog post describes the functionality of link_ntoa() and points out that none of the base utilities use this function in an exploitable manner. For more information, please see FreeBSD Security Advisory SA-16:37.

La comprobación de límites indebida en la variable obuf en la función link_ntoa() en linkaddr.c en la librería BSD libc podría permitir que un atacante lea o escriba desde la memoria. El impacto y severidad totales depende del método de explotación y de cómo las aplicaciones emplean la librería. Según el análisis de los desarrolladores de FreeBSD, es muy improbable que existan aplicaciones que empleen link_ntoa() de forma explotable; el CERT/CC no conoce la existencia de alguna prueba de concepto. Una publicación en un blog describe las funcionalidades de link_ntoa() y señala que ninguna de las utilidades base emplea esta función de forma explotable. El Security Advisory SA-16:37 de FreeBSD contiene más información.

*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

2016-08-03 CVE Reserved
2018-07-13 CVE Published
2024-04-27 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CAPEC

References (4)

URL	Tag	Source
http://www.securitytracker.com/id/1037398	Third Party Advisory
https://www.kb.cert.org/vuls/id/548487	Third Party Advisory
https://www.securityfocus.com/bid/94694	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.freebsd.org/security/advisories/FreeBSD-SA-16:37.libc.asc	2019-10-09

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				9.3 Search vendor "Freebsd" for product "Freebsd" and version "9.3"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.1 Search vendor "Freebsd" for product "Freebsd" and version "10.1"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.2 Search vendor "Freebsd" for product "Freebsd" and version "10.2"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.3 Search vendor "Freebsd" for product "Freebsd" and version "10.3"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.0 Search vendor "Freebsd" for product "Freebsd" and version "11.0"		-		Affected