oss-security - CVE Request: Ruby safe level bypasses

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Date: Tue, 2 Oct 2012 15:32:15 -0700
From: Tyler Hicks <tyhicks@...onical.com>
To: coley@...us.mitre.org
Cc: oss-security@...ts.openwall.com, security@...ntu.com,
	security@...y-lang.org
Subject: CVE Request: Ruby safe level bypasses

Hello - Upstream Ruby has fixed[1] exception methods that incorrectly
allowed safe level bypasses. These bypasses allowed untainted strings to
be modified by untrusted code in safe level 4.

Note that the changes to exc_to_s() and name_err_to_s(), in error.c, are
similar to the fix for CVE-2011-1005, but the Ruby advisory[2] made it
clear that Ruby 1.9.x was not affected by CVE-2011-1005. It turns out
that the vulnerability was later reintroduced to Ruby's trunk in
revision 29456. Ruby 1.9.3-p0 and later is affected.

While Shugo Maeda was fixing the issue above, he noticed that
name_err_mesg_to_str() had a similar flaw. Ruby 1.8.x, along with
1.9.3-p0 and later is affected.

I believe that these issues need two separate CVEs. Both issues are
fixed in the same upstream patch[1]. Could you please allocate ids?

Thanks,
Tyler

[1] http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=37068
[2] http://www.ruby-lang.org/en/news/2011/02/18/exception-methods-can-bypass-safe/

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