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FreeBSD : ruby -- Hash-flooding DoS vulnerability for ruby 1.9 (5e647ca3-2aea-11e2-b745-001fd0af1a4c)

medium Nessus Plugin ID 62886

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Synopsis

The remote FreeBSD host is missing a security-related update.

Description

The official ruby site reports :

Carefully crafted sequence of strings can cause a denial of service attack on the service that parses the sequence to create a Hash object by using the strings as keys. For instance, this vulnerability affects web application that parses the JSON data sent from untrusted entity.

This vulnerability is similar to CVS-2011-4815 for ruby 1.8.7. ruby 1.9 versions were using modified MurmurHash function but it's reported that there is a way to create sequence of strings that collide their hash values each other. This fix changes the Hash function of String object from the MurmurHash to SipHash 2-4.

Solution

Update the affected package.

See Also

http://www.nessus.org/u?060da3e3

http://www.nessus.org/u?dc4c87bc

Plugin Details

Severity: Medium

ID: 62886

File Name: freebsd_pkg_5e647ca32aea11e2b745001fd0af1a4c.nasl

Version: 1.6

Type: local

Published: 11/12/2012

Updated: 1/6/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.7

CVSS v2

Risk Factor: Medium

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Vulnerability Information

CPE: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:ruby

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Patch Publication Date: 11/10/2012

Vulnerability Publication Date: 11/10/2012

Reference Information

CVE: CVE-2012-5371