httputils.rb in WEBrick in Ruby 1.8.1 and 1.8.5, as used in Red Hat Enterprise Linux 4 and 5, allows remote attackers to cause a denial of service (CPU consumption) via a crafted HTTP request. NOTE: this issue exists because of an incomplete fix for CVE-2008-3656.

The remote Oracle Linux 5 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2008-0981 advisory.

    [1.8.5-5.el5_2.6]
    - security fix (#470262)
    - CVE-2008-4310: real fix for CVE-2008-3656. original patch named as fix for                      CVE-2008-3656 actually fixed different issue (CVE-2008-1145),                      hence we are providing correct patch and renaming original                      patch to refer to proper CVE.

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Vincent Danen reported, that Red Hat Security Advisory RHSA-2008:0897 did not properly address a denial of service flaw in the WEBrick (Ruby HTTP server toolkit), known as CVE-2008-3656. This flaw allowed a remote attacker to send a specially crafted HTTP request to a WEBrick server that would cause the server to use excessive CPU time. This update properly addresses this flaw. (CVE-2008-4310)

Updated ruby packages that fix a security issue are now available for Red Hat Enterprise Linux 4 and 5.

This update has been rated as having moderate security impact by the Red Hat Security Response Team.

Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to do system management tasks.

Vincent Danen reported, that Red Hat Security Advisory RHSA-2008:0897 did not properly address a denial of service flaw in the WEBrick (Ruby HTTP server toolkit), known as CVE-2008-3656. This flaw allowed a remote attacker to send a specially crafted HTTP request to a WEBrick server that would cause the server to use excessive CPU time. This update properly addresses this flaw. (CVE-2008-4310)

All Ruby users should upgrade to these updated packages, which contain a correct patch that resolves this issue.

The remote Redhat Enterprise Linux 4 / 5 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2008:0981 advisory.

    Ruby is an extensible, interpreted, object-oriented, scripting language. It     has features to process text files and to do system management tasks.

    Vincent Danen reported, that Red Hat Security Advisory RHSA-2008:0897     did not properly address a denial of service flaw in the WEBrick (Ruby     HTTP server toolkit), known as CVE-2008-3656. This flaw allowed a     remote attacker to send a specially-crafted HTTP request to a WEBrick     server that would cause the server to use excessive CPU time. This     update properly addresses this flaw. (CVE-2008-4310)

    All Ruby users should upgrade to these updated packages, which contain a     correct patch that resolves this issue.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Updated ruby packages that fix several security issues are now available for Red Hat Enterprise Linux 4 and 5.

This update has been rated as having moderate security impact by the Red Hat Security Response Team.

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. (CVE-2008-3657)

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. (CVE-2008-3443)

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

ID	Name	Product	Family	Severity
67767	Oracle Linux 5 : ruby (ELSA-2008-0981)	Nessus	Oracle Linux Local Security Checks	high
60502	Scientific Linux Security Update : ruby on SL4.x, SL5.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	high
35263	CentOS 4 / 5 : ruby (CESA-2008:0981)	Nessus	CentOS Local Security Checks	high
35038	RHEL 4 / 5 : ruby (RHSA-2008:0981)	Nessus	Red Hat Local Security Checks	high
34502	CentOS 4 / 5 : ruby (CESA-2008:0897)	Nessus	CentOS Local Security Checks	high
34466	RHEL 4 / 5 : ruby (RHSA-2008:0897)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2008-4310

high

Tenable Plugins

high

high

high

high

high

high