Debian DLA-263-1 : ruby1.9.1 security update

high Nessus Plugin ID 84494


The remote Debian host is missing a security update.


Two vulnerabilities were identified in the Ruby language interpreter, version 1.9.1.


Jean-Philippe Aumasson identified that Ruby computed hash values without properly restricting the ability to trigger hash collisions predictably, allowing context-dependent attackers to cause a denial of service (CPU consumption). This is a different vulnerability than CVE-2011-4815.


Thomas Hollstegge and Ben Murphy found that the JSON gem for Ruby allowed remote attackers to cause a denial of service (resource consumption) or bypass the mass assignment protection mechanism via a crafted JSON document that triggers the creation of arbitrary Ruby symbols or certain internal objects.

For the squeeze distribution, theses vulnerabilities have been fixed in version of ruby1.9.1. We recommend that you upgrade your ruby1.9.1 package.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Upgrade the affected packages.

See Also

Plugin Details

Severity: High

ID: 84494

File Name: debian_DLA-263.nasl

Version: 2.6

Type: local

Agent: unix

Published: 7/2/2015

Updated: 1/11/2021

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Nessus Agent

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libruby1.9.1, p-cpe:/a:debian:debian_linux:libruby1.9.1-dbg, p-cpe:/a:debian:debian_linux:libtcltk-ruby1.9.1, p-cpe:/a:debian:debian_linux:ri1.9.1, p-cpe:/a:debian:debian_linux:ruby1.9.1, p-cpe:/a:debian:debian_linux:ruby1.9.1-dev, p-cpe:/a:debian:debian_linux:ruby1.9.1-elisp, p-cpe:/a:debian:debian_linux:ruby1.9.1-examples, p-cpe:/a:debian:debian_linux:ruby1.9.1-full, cpe:/o:debian:debian_linux:6.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 7/1/2015

Reference Information

CVE: CVE-2012-5371, CVE-2013-0269

BID: 56484, 57899