The safe-level feature in Ruby 1.8.7 allows context-dependent attackers to modify strings via the NameError#to_s method when operating on Ruby objects. NOTE: this issue is due to an incomplete fix for CVE-2011-1005.
CVSS Severity (version 2.0):
Impact Subscore: 2.9
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows unauthorized modification
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[oss-security] 20121005 Re: CVE Request -- ruby (1.8.x with patched CVE-2011-1005): Incomplete fix for CVE-2011-1005 for NameError#to_s method when used on objects
Vulnerable software and versions