REDHAT-BUG-383341: Buffer Overflow

First published: Wed Nov 14 2007(Updated: )

<a href="https://access.redhat.com/security/cve/CVE-2006-7224">CVE-2006-7224</a> initially described several integer overflows in pcre, all described here: <a href="http://scary.beasts.org/security/CESA-2007-006.html">http://scary.beasts.org/security/CESA-2007-006.html</a> This id should be used to describe issue #1 in that advisory: 1) Integer overflow leading to buffer overflow. pcre_compile: --- /* Compute the size of data block needed and get it, either from malloc or externally provided function. */ size = length + sizeof(real_pcre) + name_count * (max_name_size + 3); re = (real_pcre *)(pcre_malloc)(size); --- Unfortunately, a malicious regex can easily cause large "name_count" and "max_name_size" such that this calculation overflows. Demo: (?P)(?P&lt;0&gt;)(?P&lt;1&gt;)...fill in this sequence...(?P&lt;4293&gt;)

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