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Date: Wed, 22 Aug 2018 20:11:00 +0100
From: Ben Hutchings <>
To: oss-security <>
Cc: Antonio Diaz Diaz <>
Subject: Re: Heap-based buffer overflow in zutils zcat

On Sun, 2018-08-05 at 21:36 +0800, Ben Hutchings wrote:
> A heap-based buffer overflow (CWE-122) was discovered in the zutils
> implementation of zcat.  It is apparently possible only if the -v
> option, or one of the other options that implies -v, is used.
> This seems to have been first discovered in 2016 as a result of
> interaction between initramfs-tools and zutils, but was initially
> thought to be a bug in the gzip implementation of zcat:
> It was eventually reported to the zutils upstream developer (Antonio
> Diaz Diaz, cc'd) in the last few weeks and was fixed in version
> 1.8-pre2.  This was announced in:
> I will request a CVE ID for this.

This has been designated as CVE-2018-1000637.


Ben Hutchings
You can't have everything.  Where would you put it?

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