Possible DoS Vulnerability with Range Header in Rack

There is a possible DoS vulnerability relating to the Range request header in
Rack. This vulnerability has been assigned the CVE identifier CVE-YYYY-XXXX.

Versions Affected: >= 1.3.0.
Not affected: < 1.3.0
Fixed Versions: 3.0.9.1, 2.2.8.1

Impact

Carefully crafted Range headers can cause a server to respond with an
unexpectedly large response. Responding with such large responses could lead
to a denial of service issue.

Vulnerable applications will use the Rack::File middleware or the
Rack::Utils.byte_ranges methods (this includes Rails applications).

Releases

The fixed releases are available at the normal locations.

Workarounds

There are no feasible workarounds for this issue.

Patches

To aid users who aren't able to upgrade immediately we have provided patches for
the two supported release series. They are in git-am format and consist of a
single changeset.

• 3-0-range.patch - Patch for 3.0 series
• 2-2-range.patch - Patch for 2.2 series

Credits

Thank you ooooooo_q for the report and
patch