Amazon Linux AMI : ruby (ALAS-2013-173)

Medium Nessus Plugin ID 69732

Synopsis

The remote Amazon Linux AMI host is missing a security update.

Description

It was discovered that Ruby's REXML library did not properly restrict XML entity expansion. An attacker could use this flaw to cause a denial of service by tricking a Ruby application using REXML to read text nodes from specially crafted XML content, which will result in REXML consuming large amounts of system memory. (CVE-2013-1821)

It was found that the RHSA-2011-0910 update did not correctly fix the CVE-2011-1005 issue, a flaw in the method for translating an exception message into a string in the Exception class. A remote attacker could use this flaw to bypass safe level 4 restrictions, allowing untrusted (tainted) code to modify arbitrary, trusted (untainted) strings, which safe level 4 restrictions would otherwise prevent. (CVE-2012-4481)

The safe-level feature in Ruby 1.8.6 through 1.8.6-420, 1.8.7 through 1.8.7-330, and 1.8.8dev allows context-dependent attackers to modify strings via the Exception#to_s method, as demonstrated by changing an intended pathname. (CVE-2011-1005)

Solution

Run 'yum update ruby' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2013-173.html

Plugin Details

Severity: Medium

ID: 69732

File Name: ala_ALAS-2013-173.nasl

Version: 1.6

Type: local

Agent: unix

Published: 2013/09/04

Updated: 2018/04/18

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 5

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:ruby, p-cpe:/a:amazon:linux:ruby-debuginfo, p-cpe:/a:amazon:linux:ruby-devel, p-cpe:/a:amazon:linux:ruby-irb, p-cpe:/a:amazon:linux:ruby-libs, p-cpe:/a:amazon:linux:ruby-rdoc, p-cpe:/a:amazon:linux:ruby-ri, p-cpe:/a:amazon:linux:ruby-static, cpe:/o:amazon:linux

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Patch Publication Date: 2013/03/14

Reference Information

CVE: CVE-2011-1005, CVE-2012-4481, CVE-2013-1821

ALAS: 2013-173

RHSA: 2013:0612