The JSON gem before 1.5.5, 1.6.x before 1.6.8, and 1.7.x before 1.7.7 for Ruby allows 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, as demonstrated by conducting a SQL injection attack against Ruby on Rails, aka "Unsafe Object Creation Vulnerability."

Updated ruby193-ruby, rubygem-json and rubygem-rdoc packages that fix two security issues are now available for Red Hat OpenShift Enterprise 1.1.3.

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 flaw in rubygem-json and ruby193-rubygem-json allowed remote attacks by creating different types of malicious objects. For example, it could initiate a denial of service attack through resource consumption by using a JSON document to create arbitrary Ruby symbols, which were never garbage collected. It could also be exploited to create internal objects which could allow a SQL injection attack. (CVE-2013-0269)

It was found that documentation created by rubygem-rdoc and ruby193-rubygem-rdoc was vulnerable to a cross-site scripting (XSS) attack. If such documentation was accessible over a network, and a remote attacker could trick a user into visiting a specially crafted URL, it would lead to arbitrary web script execution in the context of the user's session. As rubygem-rdoc and ruby193-rubygem-rdoc are used for creating documentation for Ruby source files (such as classes, modules, and so on), it is not a common scenario to make such documentation accessible over the network. (CVE-2013-0256)

Red Hat would like to thank Ruby on Rails upstream for reporting CVE-2013-0269, and Eric Hodel of RDoc upstream for reporting CVE-2013-0256. Upstream acknowledges Thomas Hollstegge of Zweitag and Ben Murphy as the original reporters of CVE-2013-0269, and Evgeny Ermakov as the original reporter of CVE-2013-0256.

Users of Red Hat OpenShift Enterprise 1.1.3 are advised to upgrade to these updated packages, which correct these issues.

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

CVE-2012-5371

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.

CVE-2013-0269

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 1.9.2.0-2+deb6u5 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.

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, as demonstrated by conducting a SQL injection attack against Ruby on Rails, aka 'Unsafe Object Creation Vulnerability.'

For Debian 6 'Squeeze', this issue has been fixed in libjson-ruby version 1.1.9-1+deb6u1.

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.

The remote host is affected by the vulnerability described in GLSA-201412-27 (Ruby: Denial of Service)

    Multiple vulnerabilities have been discovered in Ruby. Please review the       CVE identifiers referenced below for details.
  Impact :

    A context-dependent attacker could possibly execute arbitrary code with       the privileges of the process, cause a Denial of Service condition, or       bypass security restrictions.
  Workaround :

    There is no known workaround at this time.

Ruby 1.8 was updated to fix a XML entity expansion denial of service attack (CVE-2013-1821)

Ruby 1.9 was updated to 1.9.3 p392, fixing the same security issues and also :

  - update json intree to 1.5.5: Denial of Service and     Unsafe Object Creation Vulnerability in JSON     CVE-2013-0269

  - limit entity expansion text limit to 10kB CVE-2013-1821

  - get rid of a SEGV when calling rb_iter_break() from some     extention libraries.

  - some warning suppressed and smaller fixes

The remote Mac OS X host has a version of OS X Server installed that is prior to 3.0. It is, therefore, affected by the following vulnerabilities :

  - A denial of service vulnerability exists in the     included JSON Ruby Gem, which can be abused to exhaust     all available memory resources. (CVE-2013-0269)

  - Multiple cross-site scripting vulnerabilities exist in     the included Ruby on Rails software. (CVE-2013-1854 /     CVE-2013-1855 / CVE-2013-1856 / CVE-2013-1857)

  - A buffer overflow exists in the included FreeRADIUS     software that can be triggered when parsing the 'not     after' timestamp in a client certificate when using     TLS-based EAP methods. (CVE-2012-3547)

  - A logic issue exists whereby the RADIUS service could     choose an incorrect certificate from a list of     configured certificates.

Red Hat Subscription Asset Manager 1.2.1, which fixes several security issues, multiple bugs, and adds various enhancements, is now available.

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.

Red Hat Subscription Asset Manager acts as a proxy for handling subscription information and software updates on client machines.

The latest packages for Subscription Asset Manager include a number of security fixes :

When a Subscription Asset Manager instance is created, its configuration script automatically creates an RPM of the internal subscription service CA certificate. However, this RPM incorrectly created the CA certificate with file permissions of 0666. This allowed other users on a client system to modify the CA certificate used to trust the remote subscription server. All administrators are advised to update and deploy the subscription service certificate on all systems which use Subscription Asset Manager as their subscription service. This procedure is described in:
https://access.redhat.com/knowledge/docs/en-US/ Red_Hat_Subscription_Asset_Manager/1.2/html/Installation_Guide/ sect-Installation_Guide-Administration-Upgrading_Subscription_Asset_Ma nager.html (CVE-2012-6116)

Manifest signature checking was not implemented for early versions of Subscription Asset Manager. This meant that a malicious user could edit a manifest file, insert arbitrary data, and successfully upload the edited manifest file into the Subscription Asset Manager server.
(CVE-2012-6119)

Ruby's documentation generator had a flaw in the way it generated HTML documentation. When a Ruby application exposed its documentation on a network (such as a web page), an attacker could use a specially- crafted URL to open an arbitrary web script or to execute HTML code within the application's user session. (CVE-2013-0256)

A timing attack flaw was found in the way rubygem-rack and ruby193-rubygem-rack processed HMAC digests in cookies. This flaw could aid an attacker using forged digital signatures to bypass authentication checks. (CVE-2013-0263)

A flaw in rubygem-json allowed remote attacks by creating different types of malicious objects. For example, it could initiate a denial of service (DoS) attack through resource consumption by using a JSON document to create arbitrary Ruby symbols, which were never garbage collected. It could also be exploited to create internal objects which could allow a SQL injection attack. (CVE-2013-0269)

A flaw in ActiveRecord in Ruby on Rails allowed remote attackers to circumvent attribute protections and to insert their own crafted requests to change protected attribute values. (CVE-2013-0276)

HTML markup was not properly escaped when filling in the username field in the Notifications form of the Subscription Asset Manager UI.
This meant that HTML code used in the value was then applied in the UI page when the entry was viewed. This could have allowed malicious HTML code to be entered. The field value is now validated and any HTML tags are escaped. (CVE-2013-1823)

These updated packages also include bug fixes and enhancements :

* Previously, no SELinux policy for the subscription service was included with the Subscription Asset Manager packages. The candlepin-selinux package is now included with SELinux policies for the subscription server. (BZ#906901)

* When attempting to use the subscription service's CA certificate to validate a manifest during import, the comparison failed. The upstream subscription service which generated the manifest is a different service than the local subscription service; thus, they have different CA certificates. This caused importing a manifest to fail with the error 'archive failed signature'. This has been fixed so that the proper certificate is used for verification. (BZ#918778)

All users of Subscription Asset Manager are recommended to update to the latest packages.

New ruby packages are available for Slackware 13.1, 13.37, 14.0, and
-current to fix security issues.

A security flaw was discovered on the previous json that there is a denial of service and unsafe object creation vulnerability. This vulnerability has been assigned the CVE identifier CVE-2013-0269.

This new rpm will fix this issue.

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

Jean-Philippe Aumasson discovered that Ruby incorrectly generated predictable hash values. An attacker could use this issue to generate hash collisions and cause a denial of service. (CVE-2012-5371)

Evgeny Ermakov discovered that documentation generated by rdoc is vulnerable to a cross-site scripting issue. With cross-site scripting vulnerabilities, if a user were tricked into viewing a specially crafted page, a remote attacker could exploit this to modify the contents, or steal confidential data, within the same domain.
(CVE-2013-0256)

Thomas Hollstegge and Ben Murphy discovered that the JSON implementation in Ruby incorrectly handled certain crafted documents.
An attacker could use this issue to cause a denial of service or bypass certain protection mechanisms. (CVE-2013-0269).

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

Aaron Patterson reports :

When parsing certain JSON documents, the JSON gem can be coerced in to creating Ruby symbols in a target system. Since Ruby symbols are not garbage collected, this can result in a denial of service attack.

The same technique can be used to create objects in a target system that act like internal objects. These 'act alike' objects can be used to bypass certain security mechanisms and can be used as a spring board for SQL injection attacks in Ruby on Rails.

ID	Name	Product	Family	Severity
119437	RHEL 6 : ruby193-ruby, rubygem-json and rubygem-rdoc (RHSA-2013:0701)	Nessus	Red Hat Local Security Checks	high
84494	Debian DLA-263-1 : ruby1.9.1 security update	Nessus	Debian Local Security Checks	high
83167	Debian DLA-215-1 : libjson-ruby security update	Nessus	Debian Local Security Checks	high
79980	GLSA-201412-27 : Ruby: Denial of Service	Nessus	Gentoo Local Security Checks	high
74955	openSUSE Security Update : ruby (openSUSE-SU-2013:0603-1)	Nessus	SuSE Local Security Checks	high
70590	Mac OS X : OS X Server < 3.0 Multiple Vulnerabilities	Nessus	MacOS X Local Security Checks	high
65904	RHEL 6 : Subscription Asset Manager (RHSA-2013:0686)	Nessus	Red Hat Local Security Checks	high
65583	Slackware 13.1 / 13.37 / 14.0 / current : ruby (SSA:2013-075-01)	Nessus	Slackware Local Security Checks	high
65040	Fedora 18 : rubygem-json-1.6.8-1.fc18 (2013-3052)	Nessus	Fedora Local Security Checks	high
65039	Fedora 17 : rubygem-json-1.6.8-1.fc17 (2013-3050)	Nessus	Fedora Local Security Checks	high
64799	Ubuntu 12.04 LTS / 12.10 : ruby1.9.1 vulnerabilities (USN-1733-1)	Nessus	Ubuntu Local Security Checks	high
64652	FreeBSD : Ruby -- Denial of Service and Unsafe Object Creation Vulnerability in JSON (c79eb109-a754-45d7-b552-a42099eb2265)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2013-0269

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Tenable Plugins

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