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CVE-2016-6559— The BSD libc library's link_ntoa() function may be vulnerable to a classic buffer overflow

Quick assessment

Affected
BSD libc library
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeBSD是由Core Team团队负责的FreeBSD项目中的一套类Unix自由操作系统，是经过BSD、386BSD和4.4BSD发展而来的类Unix的一个重要分支。 FreeBSD中的linkaddr.c文件的‘link_ntoa()’函数存在基于栈的缓冲区溢出漏洞，该漏洞程序没有对‘obuf’参数执行边界检查。攻击者可利用该漏洞读取或写入内存。以下版本受到影响：FreeBSD Freebsd 9.3-RELEASE-p51之前的版本，10.1-RELEASE-p43之前的版本，10.2-RELE

AI Predicted 5.5 Difficulty: Theoretical EPSS 3.65% · P90

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2016-6559

Vulnerability Information
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Vulnerability Title
The BSD libc library's link_ntoa() function may be vulnerable to a classic buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是由Core Team团队负责的FreeBSD项目中的一套类Unix自由操作系统，是经过BSD、386BSD和4.4BSD发展而来的类Unix的一个重要分支。 FreeBSD中的linkaddr.c文件的‘link_ntoa()’函数存在基于栈的缓冲区溢出漏洞，该漏洞程序没有对‘obuf’参数执行边界检查。攻击者可利用该漏洞读取或写入内存。以下版本受到影响：FreeBSD Freebsd 9.3-RELEASE-p51之前的版本，10.1-RELEASE-p43之前的版本，10.2-RELE
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
BSD libc library link_ntoa() -

II. Public POCs for CVE-2016-6559

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III. Intelligence Information for CVE-2016-6559

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Vendor Advisories for CVE-2016-6559 (3)

Other References for CVE-2016-6559 (1)

IV. Related Vulnerabilities

Same vendor: BSD
Same weakness: CWE-120