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Date: Sun, 17 Jan 2021 19:31:05 -0000 (UTC)
From: Tavis Ormandy <taviso@...il.com>
To: oss-security@...ts.openwall.com
Subject: mutt recipient parsing memory leak
Hello, I noticed mutt was leaking memory whenever I opened a particular
mailbox. I tracked down the problem: Using rfc822 groups without the madatory
labels wasn't being parsed properly.
https://tools.ietf.org/html/rfc822#section-6.2.6
(A spammer had just put some junk in there, they weren't deliberately using
exotic addressing schemes.. haha).
It turns out that you can send a small message that leaks a *lot* of memory. A
small message can leak GBs of memory, effectively preventing you from opening
your mailbox. You would need to use a different mail client to clean up the
malformed message before you can use mutt again.
I sent this upstream as a DoS, but they don't want to treat it as a security
isssue. I though I'd just send a FYI here instead in case anyone wants to
backport the patch.
Here's the bug with a repro: https://gitlab.com/muttmua/mutt/-/issues/323
Here's the patch:
https://gitlab.com/muttmua/mutt/-/commit/c059e20ea4c7cb3ee9ffd3500ffe313ae84b2545
Tavis.
--
_o) $ lynx lock.cmpxchg8b.com
/\\ _o) _o) $ finger taviso@....org
_\_V _( ) _( ) @taviso
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