Ruby REXML library denial of service

ruby-rexml-dos (44628)

Low Risk

Description:

Ruby is vulnerable to a denial of service, caused by an error in the REXML library when handling recursively nested XML entities. By persuading a victim to parse a specially-crafted XML document, a remote attacker could exploit this vulnerability to cause the application to become disabled.

*CVSS:

Base Score:	4.3
Access Vector:	Network
Access Complexity:	Medium
Authentication:	None
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	Partial
Temporal Score:	3.2
Exploitability:	Unproven
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

Denial of Service

Remedy:

For Apple Mac OS:
Apply Apple Security Update 2009-002, available from the Apple Web site. See References.

Apply the patch for this vulnerability (rexml-expansion-fix.rb), available from the Ruby Programming Language Web site. See References.

References:

• Apple Web site: About the security content of Security Update 2009-002 / Mac OS X v10.5.7.
• Ruby on Rails Weblog, September 03, 2008 @ 09:43 AM: Rails 2.0.4: Maintenance release.
• Ruby Programming Language Web site: DoS vulnerability in REXML.
• ASA-2008-424: ruby security update (RHSA-2008-0897)
• BID-30802: Ruby REXML Remote Denial Of Service Vulnerability
• CVE-2008-3790: The REXML module in Ruby 1.8.6 through 1.8.6-p287, 1.8.7 through 1.8.7-p72, and 1.9 allows context-dependent attackers to cause a denial of service (CPU consumption) via an XML document with recursively nested entities, aka an XML entity explosion.
• DSA-1651: ruby1.8 -- several vulnerabilities
• DSA-1652: ruby1.9 -- several vulnerabilities
• GLSA-200812-17: Ruby: Multiple vulnerabilities
• MDVSA-2008:226: ruby
• RHSA-2008-0897: Moderate: ruby security update
• SA31602: Ruby REXML Denial of Service Vulnerability
• SA35074: Apple Mac OS X Security Update Fixes Multiple Vulnerabilities
• SECTRACK ID: 1020735: Ruby REXML Recursive Entity Expansion Bug Lets Remote Users Deny Service
• SUSE-SA:2009:037: dhcp-client security problem
• USN-651-1: Ruby vulnerabilities
• USN-691-1: Ruby vulnerability
• VUPEN/ADV-2008-2428: Ruby REXML Library Entities Handling Denial of Service Vulnerability
• VUPEN/ADV-2008-2483: Ruby on Rails REXML Library Denial of Service Vulnerability
• VUPEN/ADV-2009-1297: Apple Mac OS X Code Execution and Security Bypass Vulnerabilities

Platforms Affected:

• Apple Mac OS X 10.5
• Apple Mac OS X 10.5.1
• Apple Mac OS X 10.5.2
• Apple Mac OS X 10.5.3
• Apple Mac OS X 10.5.4
• Apple Mac OS X 10.5.5
• Apple Mac OS X 10.5.6
• Apple Mac OS X Server 10.5
• Apple Mac OS X Server 10.5.1
• Apple Mac OS X Server 10.5.2
• Apple Mac OS X Server 10.5.3
• Apple Mac OS X Server 10.5.4
• Apple Mac OS X Server 10.5.5
• Apple Mac OS X Server 10.5.6
• Canonical Ubuntu 6.06 LTS
• Canonical Ubuntu 7.04
• Canonical Ubuntu 7.10
• Canonical Ubuntu 8.04 LTS
• Canonical Ubuntu 8.10
• Debian Debian Linux 4.0
• Gentoo Linux
• MandrakeSoft Mandrake Linux 2008.0
• MandrakeSoft Mandrake Linux 2008.0 X86_64
• MandrakeSoft Mandrake Linux 2008.1
• MandrakeSoft Mandrake Linux 2008.1 X86_64
• MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
• MandrakeSoft Mandrake Linux Corporate Server 3.0
• MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
• MandrakeSoft Mandrake Linux Corporate Server 4.0
• Novell Linux Desktop 9
• Novell Linux POS 9
• Novell Open Enterprise Server
• Novell OpenSUSE 10.3
• Novell OpenSUSE 11.0
• Novell SLE SDK 10 SP2
• Novell SUSE Linux Enterprise 10 SP2 DEBUGINFO
• Novell SUSE Linux Enterprise Desktop 10 SP2
• Novell SUSE Linux Enterprise Server 10 SP2
• RedHat Enterprise Linux 4 Desktop
• RedHat Enterprise Linux 4 AS
• RedHat Enterprise Linux 4 WS
• RedHat Enterprise Linux 4 ES
• RedHat Enterprise Linux 5
• RedHat Enterprise Linux 5 Client Workstation
• RedHat Enterprise Linux 5 Client
• SuSE SuSE SLES 9
• Yukihiro Matsumoto Ruby 1.8
• Yukihiro Matsumoto Ruby 1.8.2
• Yukihiro Matsumoto Ruby 1.8.3
• Yukihiro Matsumoto Ruby 1.8.4
• Yukihiro Matsumoto Ruby 1.8.5 P230
• Yukihiro Matsumoto Ruby 1.8.5 P115
• Yukihiro Matsumoto Ruby 1.8.5 P231
• Yukihiro Matsumoto Ruby 1.8.5
• Yukihiro Matsumoto Ruby 1.8.6 P286
• Yukihiro Matsumoto Ruby 1.8.6 P230
• Yukihiro Matsumoto Ruby 1.8.6 P114
• Yukihiro Matsumoto Ruby 1.8.6 P229
• Yukihiro Matsumoto Ruby 1.8.6
• Yukihiro Matsumoto Ruby 1.8.6 P287
• Yukihiro Matsumoto Ruby 1.8.7 P72
• Yukihiro Matsumoto Ruby 1.8.7 P21
• Yukihiro Matsumoto Ruby 1.8.7
• Yukihiro Matsumoto Ruby 1.8.7 P71
• Yukihiro Matsumoto Ruby 1.8.7 P22
• Yukihiro Matsumoto Ruby 1.9
• Yukihiro Matsumoto Ruby 1.9 -1
• Yukihiro Matsumoto Ruby 1.9 -2

Reported:

Aug 23, 2008

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