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Date: Mon, 5 Jun 2017 21:32:11 -0400
From: Jeffrey Walton <>
Subject: Crypto++ and invalid read in decompressor class

Hi Everyone,

Crypto++'s ( is a free and open source
library of cryptographic schemes originally written by Wei Dai. Smart
fuzzing revealed Crypto++'s Zinflate class, used by classes like
Gunzip and Inflator, could perform an out-of-bounds read when
decompressing data.

The out-of-bounds read occurs on a table with 30 elements. The table
is static and its storage is allocated in initialized memory. The
attacker can craft a ZIP file that allows a read of the last two
non-existent elements. We believe an attacker can only read 0-bytes
due to the storage allocation. We were not able to escalate it to a
write. We believe its a low risk finding.

We were not able to induce failures in other classes using the
techniques. Other classes include those that are related, like
compressors; and those which are unrelated, like public and private

The issue is being tracked by the library at The Gentoo folks
assigned CVE-2017-9434 to track the issue.

The fix is available in Master. It is also available for several
versions of the library at


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