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Date: Mon, 4 Jul 2022 01:31:18 -0400
From: Demi Marie Obenour <demi@...isiblethingslab.com>
To: Open Source Software Security <oss-security@...ts.openwall.com>
Subject: Denial of service in GnuPG
GnuPG is vulnerable to a denial of service attack when processing
crafted detached signatures and/or certificates. By concatenating the
same signature to itself a very large number of times, and then wrapping
them in a compressed packet, I am able to cause GnuPG to take over a
minute to process an input that is less than 5KB armored.
https://dev.gnupg.org/D556 should fix this particular bug by refusing to
process compressed packets in detached signatures and/or certificates.
There may be further problems with non-detached signatures that are not
addressed by D556, but I recommend applying D556 first.
Signature (of /dev/null) that triggers this bug is attached, along with
the corresponding public key.
--
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab
Download attachment "test-key.cert" of type "application/octet-stream" (1209 bytes)
View attachment "decomp-3" of type "text/plain" (4604 bytes)
Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)
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