Detections
Analytics
CentOS 4 / 5 : ruby (CESA-2012:0070)
high Nessus Plugin ID 57734
Language:
Synopsis
The remote CentOS host is missing one or more security updates.Description
Updated ruby packages that fix two security issues are now available for Red Hat Enterprise Linux 4 and 5.The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.
Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to do system management tasks.
A denial of service flaw was found in the implementation of associative arrays (hashes) in Ruby. An attacker able to supply a large number of inputs to a Ruby application (such as HTTP POST request parameters sent to a web application) that are used as keys when inserting data into an array could trigger multiple hash function collisions, making array operations take an excessive amount of CPU time. To mitigate this issue, randomization has been added to the hash function to reduce the chance of an attacker successfully causing intentional collisions. (CVE-2011-4815)
It was found that Ruby did not reinitialize the PRNG (pseudorandom number generator) after forking a child process. This could eventually lead to the PRNG returning the same result twice. An attacker keeping track of the values returned by one child process could use this flaw to predict the values the PRNG would return in other child processes (as long as the parent process persisted). (CVE-2011-3009)
Red Hat would like to thank oCERT for reporting CVE-2011-4815. oCERT acknowledges Julian Walde and Alexander Klink as the original reporters of CVE-2011-4815.
All users of ruby are advised to upgrade to these updated packages, which contain backported patches to resolve these issues.
Solution
Update the affected ruby packages.See Also
Plugin Details
Severity: High
ID: 57734
File Name: centos_RHSA-2012-0070.nasl
Version: 1.12
Type: local
Agent: unix
Family: CentOS Local Security Checks
Published: 1/31/2012
Updated: 1/4/2021
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Agentless Assessment, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.6
CVSS v2
Risk Factor: High
Base Score: 7.8
Temporal Score: 5.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2011-4815
Vulnerability Information
CPE: p-cpe:/a:centos:centos:ruby-devel, p-cpe:/a:centos:centos:ruby-libs, p-cpe:/a:centos:centos:ruby-rdoc, p-cpe:/a:centos:centos:ruby, p-cpe:/a:centos:centos:ruby-docs, p-cpe:/a:centos:centos:ruby-irb, p-cpe:/a:centos:centos:ruby-ri, cpe:/o:centos:centos:4, cpe:/o:centos:centos:5, p-cpe:/a:centos:centos:ruby-tcltk, p-cpe:/a:centos:centos:irb, p-cpe:/a:centos:centos:ruby-mode
Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 1/30/2012
Vulnerability Publication Date: 8/5/2011
Reference Information
CVE: CVE-2011-3009, CVE-2011-4815
RHSA: 2012:0070