RubyGems extract_files() file overwrite

rubygems-extractfiles-file-overwrite (31688)

Medium Risk

Description:

RubyGems could allow a remote attacker to overwrite arbitrary files on the system, caused by the improper validation of paths by the extract_files() function. A remote attacker could exploit this vulnerability to overwrite files, resulting in a denial of service, or possibly gain elevated privileges on the system.

*CVSS:

Base Score:	7
Access Vector:	Remote
Access Complexity:	Low
Authentication:	Not Required
Confidentiality Impact:	Partial
Integrity Impact:	Partial
Availability Impact:	Partial
Temporal Score:	5.2
Exploitability:	Unproven
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

File Manipulation

Remedy:

Upgrade to the latest version of RubyGems (0.9.1 or later), available from the RubyForge Web site. See References.

References:

• Full-Disclosure Mailing List, Sun Jan 21 2007 - 03:09:39 CST: RubyGems 0.9.0 and earlier installation exploit.
• RubyForge Web site: RubyGems.
• CVE-2007-0469: The extract_files function in installer.rb in RubyGems before 0.9.1 does not check whether files exist before overwriting them, which allows user-assisted remote attackers to overwrite arbitrary files, cause a denial of service, or execute arbitrary code via crafted GEM packages.
• SUSE-SR:2007:004: SUSE Security Summary Report
• VUPEN/ADV-2007-0295: RubyGems extract_files() Installation Procedure Arbitrary File Overwrite Vulnerability

Platforms Affected:

• RubyForge RubyGems 0.9.0 and prior

Reported:

Jan 21, 2007

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