View at Official ubuntu advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2011-1005 low priority: Ubuntu including 3 source packages (ruby1.8, ruby1.9, ruby1.9.1), 27 status rows across 9 suites (dapper, hardy, karmic, lucid, maverick, natty, oneiric, precise, upstream): ignored 8, DNE 6, not-affected 6, released 5, needs-triage 2.
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.