tenderlove
(Aaron Patterson)
1
There is a possible DoS vulnerability in the Multipart MIME parsing code in
Rack. This vulnerability has been assigned the CVE identifier CVE-2023-27530.
Versions Affected: All.
Not affected: None
Fixed Versions: 3.0.4.2, 2.2.6.3, 2.1.4.3, 2.0.9.3
Impact
The Multipart MIME parsing code in Rack limits the number of file parts, but
does not limit the total number of parts that can be uploaded. Carefully
crafted requests can abuse this and cause multipart parsing to take longer than
expected.
All users running an affected release should either upgrade or use one of the
workarounds immediately.
Releases
The fixed releases are available at the normal locations.
Workarounds
A proxy can be configured to limit the POST body size which will mitigate 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-multipart-dos.patch - Patch for the 3.0 series
- 2-2-multipart-dos.patch - Patch for the 2.2 series
- 2-1-multipart-dos.patch - Patch for the 2.1 series
- 2-0-multipart-dos.patch - Patch for the 2.0 series
Credits
Thanks to @das7pad for reporting this!
2-1-multipart-dos.patch (7.3 KB)
2-2-multipart-dos.patch (7.3 KB)
3-0-multipart-dos.patch (7.8 KB)
2-0-multipart-dos.patch (7.3 KB)
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