As noted in bug #862598:
Originally, Common Vulnerabilities and Exposures assigned an identifier CVE-2011-1005 to the following vulnerability:
The safe-level feature in Ruby 1.8.6 through 1.8.6-420, 1.8.7 through 1.8.7-330, and 1.8.8dev allows context-dependent attackers to modify strings via the Exception#to_s method, as demonstrated by changing an intended pathname.
Later it was reported:
that upstream ruby 1.9.1 and ruby 1.9.3 versions are also vulnerable to this flaw.
Relevant upstream patch:
There are two issues here:
1) CVE-2011-1005 was never reported to affect ruby 1.9.x, but it was later introduced (or re-introduced) on trunk, via r29456. So ruby 1.9.3-p0 and later is affected by the same flaw that was assigned CVE-2011-1005 in 1.8.x (it's been assigned the name CVE-2012-4464)
2) The name_err_mesg_to_str() function has a similar flaw, and it affects both 1.8.x and 1.9.3-p0 and later. This was assigned the name CVE-2012-4466.
CVE assignments and explanations:
Created ruby tracking bugs for this issue
Affects: fedora-all [bug 862907]