mime/multipart: limit parsed mime message sizes
The parsed forms of MIME headers and multipart forms can consume
substantially more memory than the size of the input data.
A malicious input containing a very large number of headers or
form parts can cause excessively large memory allocations.
Set limits on the size of MIME data:
Reader.NextPart and Reader.NextRawPart limit the the number
of headers in a part to 10000.
Reader.ReadForm limits the total number of headers in all
FileHeaders to 10000.
Both of these limits may be set with with
GODEBUG=multipartmaxheaders=<values>.
Reader.ReadForm limits the number of parts in a form to 1000.
This limit may be set with GODEBUG=multipartmaxparts=<value>.
Thanks for Jakob Ackermann (@das7pad) for reporting this issue.
For CVE-2023-24536
For #59153
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/
1802455
Run-TryBot: Damien Neil <dneil@google.com>
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Reviewed-by: Julie Qiu <julieqiu@google.com>
Change-Id: I08dd297bd75724aade4b0bd6a7d19aeca5bbf99f
Reviewed-on: https://go-review.googlesource.com/c/go/+/482077
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>