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Test ID:
Category:Red Hat Local Security Checks
Title:RedHat Security Advisory RHSA-2008:0897

The remote host is missing updates announced in
advisory RHSA-2008:0897.

Ruby is an interpreted scripting language for quick and easy
object-oriented programming.

The Ruby DNS resolver library, resolv.rb, used predictable transaction IDs
and a fixed source port when sending DNS requests. A remote attacker could
use this flaw to spoof a malicious reply to a DNS query. (CVE-2008-3905)

Ruby's XML document parsing module (REXML) was prone to a denial of service
attack via XML documents with large XML entity definitions recursion. A
specially-crafted XML file could cause a Ruby application using the REXML
module to use an excessive amount of CPU and memory. (CVE-2008-3790)

An insufficient taintness check flaw was discovered in Ruby's DL module,
which provides direct access to the C language functions. An attacker could
use this flaw to bypass intended safe-level restrictions by calling
external C functions with the arguments from an untrusted tainted inputs.

A denial of service flaw was discovered in WEBrick, Ruby's HTTP server
toolkit. A remote attacker could send a specially-crafted HTTP request to a
WEBrick server that would cause the server to use an excessive amount of
CPU time. (CVE-2008-3656)

A number of flaws were found in the safe-level restrictions in Ruby. It
was possible for an attacker to create a carefully crafted malicious script
that can allow the bypass of certain safe-level restrictions. (CVE-2008-3655)

A denial of service flaw was found in Ruby's regular expression engine. If
a Ruby script tried to process a large amount of data via a regular
expression, it could cause Ruby to enter an infinite-loop and crash.

Users of ruby should upgrade to these updated packages, which contain
backported patches to resolve these issues.

Please note that this update is available via
Red Hat Network. To use Red Hat Network, launch the Red
Hat Update Agent with the following command: up2date

Risk factor : High

CVSS Score:

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2008-3443
BugTraq ID: 30682
Cert/CC Advisory: TA09-133A
Debian Security Information: DSA-1695 (Google Search)
XForce ISS Database: ruby-regex-dos(44688)
Common Vulnerability Exposure (CVE) ID: CVE-2008-3655
BugTraq ID: 30644
Bugtraq: 20080831 rPSA-2008-0264-1 ruby (Google Search)
Debian Security Information: DSA-1651 (Google Search)
Debian Security Information: DSA-1652 (Google Search)
XForce ISS Database: ruby-safelevel-security-bypass(44369)
Common Vulnerability Exposure (CVE) ID: CVE-2008-3656
XForce ISS Database: ruby-webrick-dos(44371)
Common Vulnerability Exposure (CVE) ID: CVE-2008-3657
XForce ISS Database: ruby-dl-security-bypass(44372)
Common Vulnerability Exposure (CVE) ID: CVE-2008-3790
BugTraq ID: 30802
XForce ISS Database: ruby-rexml-dos(44628)
Common Vulnerability Exposure (CVE) ID: CVE-2008-3905
BugTraq ID: 31699
XForce ISS Database: ruby-resolv-dns-spoofing(45935)
CopyrightCopyright (c) 2008 E-Soft Inc.

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