Ruby ARGF.inplace_mode buffer overflow

ruby-argfinplacemode-bo (60135)

High Risk

Description:

Ruby is vulnerable to a buffer overflow, caused by improper bounds checking when handling filenames on Windows systems. By assigning a malicious value to the ARGF.inplace_mode variable, a local attacker could exploit this vulnerability to overflow a buffer and execute arbitrary code on the system or cause the application to crash.

*CVSS:

Base Score:	4.6
Access Vector:	Local
Access Complexity:	Low
Authentication:	None
Confidentiality Impact:	Partial
Integrity Impact:	Partial
Availability Impact:	Partial
Temporal Score:	3.4
Exploitability:	Unproven
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

Gain Access

Remedy:

Upgrade to the latest version of Ruby (1.9.2 -rc1, 1.9.1 -p429 or later), available from the Ruby Web site. See References.

References:

• Ruby Web Site: Ruby 1.9.2 RC1 is released.
• Ruby Web site: Ruby 1.9.1-p429 is released.
• BID-41321: Ruby 'ARGF.inplace_mode' Buffer Overflow Vulnerability
• CVE-2010-2489: Buffer overflow in Ruby 1.9.x before 1.9.1-p429 on Windows might allow local users to gain privileges via a crafted ARGF.inplace_mode value that is not properly handled when constructing the filenames of the backup files.
• OSVDB ID: 66040: Ruby on Windows ARGF.inplace_mode Variable Local Overflow
• SA40442: Ruby ARGF.inplace_mode Buffer Overflow Vulnerability

Platforms Affected:

• Ruby-lang Ruby 1.9
• Ruby-lang Ruby 1.9.1
• Ruby-lang Ruby 1.9.1-p129

Reported:

Jul 04, 2010

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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