[LRUG] Serious Vulnerability in all versions of Rails. Upgrade now.

[Stephen Bartholomew]

All the common exploits leverage Psych's automatic hash instantiation to
run arbitrary code.  Because that's not present in 1.8.7 (and early 1.9.2)
I'm struggling to replicate on some older deployments.

Has anyone found other methods being used?

(just to clarify, I'm totally patched/updated - just exploring the exploit
and testing)

S
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