[3.6] bpo-30835: email: Fix AttributeError when parsing invalid CTE (GH-13598) #13821
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…GH-13598) * bpo-30835: email: Fix AttributeError when parsing invalid Content-Transfer-Encoding Parsing an email containing a multipart Content-Type, along with a Content-Transfer-Encoding containing an invalid (non-ASCII-decodable) byte will fail. email.feedparser.FeedParser._parsegen() gets the header and attempts to convert it to lowercase before comparing it with the accepted encodings, but as the header contains an invalid byte, it's returned as a Header object rather than a str. Cast the Content-Transfer-Encoding header to a str to avoid this. Found using the AFL fuzzer. Reported-by: Daniel Axtens <dja@axtens.net> Signed-off-by: Andrew Donnellan <andrew@donnellan.id.au> * Add email and NEWS entry for the bugfix. (cherry picked from commit aa79707) Co-authored-by: Abhilash Raj <maxking@users.noreply.github.com>
bedevere-bot
added
type-bug
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Is this considered security fix? |
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@Mariatta I don't think so, just a bugfix I believe. |
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Thanks @maxking . Closing. |
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Parsing an email containing a multipart Content-Type, along with a
Content-Transfer-Encoding containing an invalid (non-ASCII-decodable) byte
will fail. email.feedparser.FeedParser._parsegen() gets the header and
attempts to convert it to lowercase before comparing it with the accepted
encodings, but as the header contains an invalid byte, it's returned as a
Header object rather than a str.
Cast the Content-Transfer-Encoding header to a str to avoid this.
Found using the AFL fuzzer.
Reported-by: Daniel Axtens dja@axtens.net
Signed-off-by: Andrew Donnellan andrew@donnellan.id.au
(cherry picked from commit aa79707)
Co-authored-by: Abhilash Raj maxking@users.noreply.github.com
https://bugs.python.org/issue30835